Senior Backend Engineer, Jakarta, Indonesia, remote

Andre Christi Kan

Senior backend engineer with 8 years across fintech, web3 gaming, and market research. I lead small teams from architecture through production on NestJS and TypeScript. I have worked as a backend, lead and fullstack engineer. My work spans monolith, microservice, event-driven and clean architectures, payment, real-time and SaaS systems, and cloud infrastructure. I have also built mobile apps in Dart and Flutter, and web dashboards in Next.js and Nuxt.js. I mentor junior engineers, review code and set technical direction. I built ack-nestjs-boilerplate and remain its sole maintainer (700+ GitHub stars), reviewing contributor pull requests.

open-source.md

01Open source

andrechristikan / ack-nestjs-boilerplate Public

sole maintainer since Jan 2022, MIT licence

stars: 700+
release: v9.1.0
coverage: 100%
guides: 32

A NestJS starter for teams that would rather not rebuild authentication, permissions and multi-tenancy for every new service. It targets enterprise apps, auth services, mobile backends, multi-tenant SaaS and startup MVPs. My own work and freelance backends start from it.

NestJS 12
TypeScript 6
Prisma 6
MongoDB
Redis
BullMQ
Zod 4
Vitest
AWS
Docker

View on GitHub View details

experience.md › git log --graph

02Experience

Senior Backend Engineer, Rektstudios, full-time HEADpromoted
Senior Backend Engineer, Rektstudios, part-time
Nov 2024 – Present, 1 year 11 months, full-time, remote
Sep 2024 – Nov 2024, 2 months, part-time, remote
- One of the founding backend engineers (team of 3). Co-built Rekt Game Core from scratch, a NestJS backend for auth, wallet, store, marketplace, game orchestration, XP and level progression, battle pass, and referral reward. HTTP serves clients, RabbitMQ talks to other services, BullMQ on Redis runs workers. We took it from zero to 10k+ registered players and 17k+ SpludgeWars matches played. Reviewed code within the team
- Partnered with a blockchain developer on wallet flows and on-chain withdrawals. Together we built NFT minting and on-chain reward transfers. Consumed RabbitMQ indexer events for purchases and order fills. Coordinated with the game and frontend teams
- Built a wallet ledger for off-chain credit and custodial ERC-20. Internal transfers stay off-chain, withdrawals settle on-chain. Hardened writes with Postgres advisory locks, CAS status transitions, and idempotency keys
- Built store purchases across off-chain, custodial, and self-custody wallets. Rekt Game Core credits the custodial ledger on failed or refunded on-chain payments
- Unified WEB2 and WEB3 trading on a marketplace. WEB2 fills settle as buyer debit, NFT ownership, seller credit. WEB3 fills arrive from Envio on RabbitMQ and a job applies it
- Built battle pass rewards (tokens, inventory-first NFTs, tickets, XP boosts) and a shared reward grant pipeline for battle pass and referral reward with idempotent wallet jobs
- Added Rekt Game Core auth with JWT, 2FA, email and phone verification, SIWE, and OAuth (Google, Snapchat)
- Built uncapped XP and level progression and a realtime leaderboard (account and character, daily through all-time), with 3-month seasons run by queue jobs
- Co-built Rekt Game Chat from scratch, a NestJS service (GraphQL + Socket.IO, Redis adapter). It handles DMs, public/private/global groups, friends and blocking, typing indicators, and multi-device presence. Global groups allow guests
2 files changed rektstudios-core.md rektstudios-chat.md
Lead Engineer, Kadence International promoted
Senior Backend Engineer, Kadence International
Jan 2024 – Nov 2024, 10 months, full-time, hybrid
Jul 2021 – Dec 2023, 2 years 5 months, full-time, hybrid
- Built Kadence Kepo (Jul 2021 – Dec 2021), Kadence's field-operation app for its registered shoppers. Built the backend, the Android app and the infrastructure, while a teammate built the web dashboard's front end. Served 1k⁠–⁠2k users and ran 3 fieldwork projects at once, with 50 MB chunked uploads
- As the first engineer, interviewed the internal users and benchmarked other apps, then designed and led K-⁠OINS (Jan 2022 – Nov 2024), Kadence's survey and panel app on the App Store and Google Play. Built its Flutter app and its 4 NestJS microservices on MongoDB. They share a backend with Kepo and talk only through RabbitMQ
- Replaced a vendor app that cost IDR 780⁠–⁠900M in its first year (IDR 300M to build, IDR 20M a month in maintenance, IDR 20⁠–⁠30M a month for servers and services). Built in-house, K-⁠OINS cost about IDR 540M less in its first year, about 60–69% lower than the vendor, and IDR 240M less a year after. The in-house build paid for itself in the first year
- Rated 4.2 (84%) on the App Store and 3.6 (72%) on Google Play (the vendor app it replaced scored 2 and 1), with 18k registered panelists, about 2k (11%) active monthly, and 2–3 surveys a week
- Rate-limited to 100 answers per second so the small servers do not fall over. Xendit withdrawals total up to IDR 5M a month, at most IDR 300K per panelist
- Led Internal Tools, a NestJS and Next.js expense platform for multi-workspace claims, purchase orders, reimbursements, and settlements with S3 uploads and PDF export
- Led the team of 1 web front-end engineer, 1 designer and 2 interns. Set the design and technical direction and mentored the interns. Owned the service architecture and CI/CD with GitHub Actions from the start and Docker deploys
3 files changed kadence-k-oins.md kadence-internal-tools.md kadence-kepo.md
Associate Fullstack Engineer, Gradana Indonesia
Mar 2020 – Jul 2021, 1 year 4 months, full-time, on-site
- Migrated a monolith to microservices in stages on a live production system
- Designed Alibaba Cloud compute, networking, and storage for web and mobile
- Set up Jenkins CI/CD and automated tests
- Supported OJK (Otoritas Jasa Keuangan) certification for Gradana, a P2P lending platform
Backend Engineer, Gtech Digital
Apr 2019 – Mar 2020, 11 months, full-time, on-site
- Built and maintained MAP Loyalty System APIs, a multi-tenant loyalty platform for iOS, Android and web clients
- Turned product requirements and user stories into workflows and API contracts
- Designed and tuned NoSQL and MySQL schemas for loyalty transactions with high-frequency reads and writes
- Diagnosed production incidents through the ticketing system
- Owned MAP Loyalty System maintenance. Handled monitoring, hotfixes, and performance tuning
Backend Engineer, Kepo Solusi Indonesia initial commit
Oct 2018 – Apr 2019, 6 months, full-time, on-site
- Built REST APIs for web and mobile clients
- Designed workflows from business and technical requirements
- Designed databases and tuned query performance

projects/

03Projects

ack-nestjs-boilerplate Open source#001 Open-source NestJS starter for new services View project
Rekt Game Core Rektstudios#002 Main backend of a competitive blockchain game View project
Rekt Game Chat Rektstudios#003 Real-time messaging for a blockchain game View project
Kadence K-⁠OINS Kadence#004 Online survey and panel app for Indonesia View project
Kadence Internal Tools Kadence#005 Expense platform for internal use View project
Kadence Kepo Kadence#006 Field-operation app for registered shoppers View project
Korner Freelance#007 App for paid live legal consultations View project
Confidential Field Operation Platform Freelance#008 Market-research platform for field visits View project
Gradana Gradana Indonesia P2P lending platform
MAP Loyalty System Gtech Digital Multi-tenant loyalty system for iOS, Android and web
confidential client Vehicle Rental System Freelance Web platform for vehicle rental

stack.md › extensions

04Stack

The tools and standards I have shipped with, and the projects on this site that used them.

Languages and runtimes

TypeScriptack-nestjs-boilerplate, Rekt Game Core, Rekt Game Chat, Kadence K-OINS, Kadence Internal Tools, Korner, Field Operation Platform
JavaScript
Node.jsack-nestjs-boilerplate, Rekt Game Core, Rekt Game Chat, Kadence K-OINS, Kadence Internal Tools, Korner, Field Operation Platform
SWCack-nestjs-boilerplate, Rekt Game Core, Rekt Game Chat, Field Operation Platform
DartKadence K-OINS, Korner, Field Operation Platform
JavaVehicle Rental System

Frameworks

NestJSack-nestjs-boilerplate, Rekt Game Core, Rekt Game Chat, Kadence K-OINS, Kadence Internal Tools, Kadence Kepo, Korner, Field Operation Platform
FlutterKadence K-OINS, Kadence Kepo, Korner, Field Operation Platform
Next.jsKadence Internal Tools, Korner
React.jsKadence Internal Tools
Vue.jsField Operation Platform
Nuxt.jsField Operation Platform
ViteField Operation Platform
VuetifyField Operation Platform
Vert.xVehicle Rental System
PuppeteerKadence Internal Tools
EthersRekt Game Core

Data

PostgreSQLRekt Game Core, Vehicle Rental System
MongoDBack-nestjs-boilerplate, Rekt Game Chat, Kadence K-OINS, Kadence Internal Tools, Kadence Kepo, Korner, Field Operation Platform
MySQLMAP Loyalty System
Redisack-nestjs-boilerplate, Rekt Game Core, Rekt Game Chat, Kadence Internal Tools
Prismaack-nestjs-boilerplate, Rekt Game Core, Rekt Game Chat
MongooseKadence K-OINS, Kadence Internal Tools, Korner, Field Operation Platform

Messaging and real time

RabbitMQRekt Game Core, Rekt Game Chat, Kadence K-OINS, Kadence Kepo
Kafka
BullMQack-nestjs-boilerplate, Rekt Game Core, Kadence Internal Tools
AgendaField Operation Platform
Socket.IORekt Game Chat
WebSocketRekt Game Chat
GraphQLRekt Game Chat
ApolloRekt Game Chat

Auth and access

JWTack-nestjs-boilerplate, Rekt Game Core, Rekt Game Chat, Kadence K-OINS, Kadence Internal Tools, Korner, Field Operation Platform
OAuthack-nestjs-boilerplate, Rekt Game Core
TOTPack-nestjs-boilerplate, Rekt Game Core
SIWERekt Game Core
PassportRekt Game Core, Kadence K-OINS, Korner
CASLack-nestjs-boilerplate, Rekt Game Core, Kadence K-OINS, Kadence Internal Tools, Korner, Field Operation Platform

Contracts and testing

Zodack-nestjs-boilerplate
Swagger / OpenAPIack-nestjs-boilerplate, Rekt Game Core, Kadence K-OINS, Kadence Internal Tools, Korner, Field Operation Platform
JestRekt Game Core, Rekt Game Chat, Kadence K-OINS, Kadence Internal Tools, Korner
Vitestack-nestjs-boilerplate, Kadence Internal Tools

Cloud and delivery

AWSack-nestjs-boilerplate, Rekt Game Core, Kadence K-OINS, Kadence Internal Tools, Korner, Field Operation Platform
AWS S3ack-nestjs-boilerplate, Rekt Game Core, Kadence K-OINS, Kadence Internal Tools, Kadence Kepo, Korner, Field Operation Platform
AWS SESack-nestjs-boilerplate, Rekt Game Core, Kadence Internal Tools, Korner
AWS Lambda
Alibaba CloudGradana
Dockerack-nestjs-boilerplate, Kadence K-OINS, Kadence Internal Tools, Korner, Field Operation Platform
Nginx
GitHub Actionsack-nestjs-boilerplate, Kadence K-OINS, Kadence Internal Tools, Korner, Field Operation Platform
JenkinsGradana
Pinoack-nestjs-boilerplate, Rekt Game Core, Rekt Game Chat, Field Operation Platform

Services

Sentryack-nestjs-boilerplate, Rekt Game Core, Rekt Game Chat, Kadence Internal Tools, Korner, Field Operation Platform
Firebase FCMack-nestjs-boilerplate
thirdweb EngineRekt Game Core
AlchemyRekt Game Core
MoralisRekt Game Core
EnvioRekt Game Core
StripeRekt Game Core
XenditKadence K-OINS, Korner
TwilioKorner
OneSignalKadence K-OINS, Korner
SendGridKadence K-OINS, Kadence Internal Tools

Planning

Jira
TrelloKadence K-OINS

README.md › skills, education, languages

05Skills, education and languages

Expertise: Software development
Backend development
Fullstack development
Mobile development
System architecture
System design
API design
Database design
Distributed systems
Message queues
Payment systems
Scalability
Performance optimization
Code review
Technical leadership
Technical guidance
Mentoring
Requirements analysis
Project coordination
Agile
Scrum
Architecture: Monolith
Microservices
Event-Driven Architecture
Clean Architecture
Design patterns
REST APIs
Multi-tenant
Data and consistency: Idempotency
Wallet ledger
Advisory locks
Compare-and-swap
Sagas
Query tuning
Security and auth: RBAC
2FA
Rate limiting
Real time and jobs: Horizontal scaling
Pub/sub
Background jobs
Delivery and ops: CI/CD
Automated testing
Cloud infrastructure design
Monitoring
Incident handling

education

Bachelor of Information Systems, E-Business

Bina Nusantara University (Binus), 2014 – 2018, GPA 3.3

languages

Indonesian native
English professional working proficiency

contact.md

06Contact

Open to Work

Senior backend or lead engineer roles, remote. If you are hiring, email me.

andrechristikan@gmail.com

Jakarta, Indonesia. I work remotely.

Hire Me

# Page content: source of truth for the portfolio page
The PDF CV uses `data/summary.md` (short, scannable). This file feeds README and the section files
(`src/components/sections/*.jsx`) and may explain more. The full story of each project lives in
`data/projects/<project>.md` and feeds its project page, `src/app/projects/<slug>/page.jsx`. Same rule for all of them:
no fact appears here that the owner has not confirmed. Lines marked `TODO(owner)` or `TODO(repo)` stay off the page.
Voice: `docs/brand.md`. First person on the page.
# Landing page (hero)
The landing page at `/` is the hero, a page of its own outside the editor, with everything centred. Designed and
approved by the owner (2026-09-28).
Page title: Andre Christi Kan, Senior Backend Engineer
Description: Andre Christi Kan, senior backend engineer in Jakarta, working remotely. 8 years across fintech, web3 gaming, and market research. I lead small teams from architecture through production.
Andre Christi Kan
Senior Backend Engineer
8 years across fintech, web3 gaming, and market research. I lead small teams from architecture through production.
Buttons: "Open portfolio" (primary, opens the editor at `/readme`) and "View on GitHub" (github.com/andrechristikan, opens in a new tab)
Stack strip along the bottom, labelled "Tools I have shipped with", in this order: TypeScript, Node.js, NestJS,
PostgreSQL, MongoDB, Redis, Prisma, BullMQ, RabbitMQ, Socket.IO, GraphQL, Zod, Docker, GitHub Actions, AWS, Flutter.
Each tool shows its official full-colour logo and its name; every tool is in the Stack list below. The strip always
moves and loops. Visitors can drag it, swipe it or scroll it sideways, and it pauses on hover or focus. Under reduced
motion it keeps moving at half speed (owner's choice).
# README intro (top of README.md in the editor)
Andre Christi Kan
Senior Backend Engineer, Jakarta, Indonesia, remote
## Intro (first person, from the summary in `summary.md`)
Senior backend engineer with 8 years across fintech, web3 gaming, and market research. I lead small teams from architecture through production on NestJS and TypeScript. I have worked as a backend, lead and fullstack engineer. My work spans monolith, microservice, event-driven and clean architectures, payment, real-time and SaaS systems, and cloud infrastructure. I have also built mobile apps in Dart and Flutter, and web dashboards in Next.js and Nuxt.js. I mentor junior engineers, review code and set technical direction. I built ack-nestjs-boilerplate and remain its sole maintainer (700+ GitHub stars), reviewing contributor pull requests.
# Open source: ack-nestjs-boilerplate
github.com/andrechristikan/ack-nestjs-boilerplate, 700+ GitHub stars, MIT licence
Sole maintainer since Jan 2022. Current release: v9.1.0.
A NestJS starter for teams that would rather not rebuild authentication, permissions and multi-tenancy for every new service. It targets enterprise apps, auth services, mobile backends, multi-tenant SaaS and startup MVPs. My own work and freelance backends start from it.
Repo stats: 700+ stars, release v9.1.0, a 100% unit coverage threshold, 32 guides.
Docs: 32 guides in the repo's docs folder (https://github.com/andrechristikan/ack-nestjs-boilerplate/tree/main/docs), indexed by docs/readme.md (https://github.com/andrechristikan/ack-nestjs-boilerplate/blob/main/docs/readme.md).
Stack: NestJS 12, TypeScript 6, Prisma 6, MongoDB, Redis, BullMQ, Zod 4, Vitest, AWS, Docker
Buttons: "View on GitHub" (github.com/andrechristikan/ack-nestjs-boilerplate) and "View details" (`/projects/opensource-ack-nestjs-boilerplate`)
# Experience
Order: newest first. The page shows it as a git history. Rektstudios and Kadence each have two positions, so those two git messages come first and the dates, the task lines and the file links sit under both. Rektstudios full-time carries the promoted tag, the same tag Kadence Lead Engineer carries. Every other role is one commit: the title, then its dates, then every CV bullet of that title from `summary.md` as one task per row, and links to the project files it touched. The systems themselves are described under Projects.
## Rektstudios
Senior Backend Engineer, full-time, remote. Nov 2024 – Present. 1 year 11 months
Senior Backend Engineer, part-time, remote. Sep 2024 – Nov 2024. 2 months
## Kadence International
Lead Engineer, full-time, hybrid. Jan 2024 – Nov 2024. 10 months
Senior Backend Engineer, full-time, hybrid. Jul 2021 – Dec 2023. 2 years 5 months
## Gradana Indonesia
Associate Fullstack Engineer, full-time, on-site. Mar 2020 – Jul 2021. 1 year 4 months
## Gtech Digital
Backend Engineer, full-time, on-site. Apr 2019 – Mar 2020. 11 months
## Kepo Solusi Indonesia
Backend Engineer, full-time, on-site. Oct 2018 – Apr 2019. 6 months
# Projects
README shows one card per project, in the order below: the logo, the name, where it was done with the card's number under the name, and one line for what the product is (the "Card" line). The 8 projects with a project page are numbered #001 to #008 and link to it. The 3 without one show no number and no label, and do not link. Confidential work shows "confidential client" instead of a logo; MAP Loyalty System shows the MAPCLUB logo; Kadence Kepo shows the Kadence logo.
Filters above the cards: All, Open source, Rektstudios, Kadence, Freelance. Gradana and MAP Loyalty System appear under All only.
Each entry below keeps the facts behind the card: role, where, dates, platforms, stack and a short description. The full story is in `data/projects/<project>.md`.
## ack-nestjs-boilerplate, open source
Sole maintainer, open source. Jan 2022 – Present
Stack: NestJS 12, TypeScript 6, Prisma 6, MongoDB, Redis, BullMQ, Zod 4, Vitest, AWS, Docker
Card: Open-source NestJS starter for new services
My NestJS starter, described in full under Open source above.
Project page: `/projects/opensource-ack-nestjs-boilerplate`
## Rekt Game Core, Rektstudios
Founding backend engineer (team of 3), Rektstudios, part-time, then full-time from Nov 2024. Sep 2024 – Present
Stack: NestJS, TypeScript, PostgreSQL, Prisma, Redis, RabbitMQ, BullMQ, AWS
Card: Main backend of a competitive blockchain game
The main backend of a blockchain game, built from scratch by our backend team: auth, wallet, store, NFT marketplace, game runs, XP and level progression, battle pass, referral reward and realtime leaderboard in one NestJS service. HTTP to clients. Core consumes game and indexer events from RabbitMQ. Core publishes only profile sync to Chat on RabbitMQ. Mint and transfer go out through the Engine SDK. BullMQ on Redis runs workers. Money writes go through a wallet ledger with Postgres advisory locks, compare-and-swap status transitions and idempotency keys. WEB2 and WEB3 trades share a marketplace. A WEB2 fill settles as buyer debit, NFT ownership and seller credit. A WEB3 fill arrives from Envio on RabbitMQ and a job applies it. Sign-up can take an optional referral code, issues the user's own code and grants a free character. Login checks active and 2FA, then issues a JWT. Stripe card top-up from $5 to $500: Core creates the intent, re-fetches the PaymentIntent after the Stripe webhook, then enqueues the wallet credit. SpludgeWars match XP writes on the primary. Leaderboard lists read the replica, daily through all-time, top 100. CryptoRun game runs go through a BullMQ queue capped at 5 concurrent games.
Project page: `/projects/rektstudios-core`
## Rekt Game Chat, Rektstudios
Founding backend engineer (team of 3), Rektstudios, full-time. May 2025 – Present
Stack: NestJS, GraphQL, Socket.IO, MongoDB, Redis, RabbitMQ
Card: Real-time messaging for a blockchain game
The game's messaging service, built from scratch by the same team: direct messages, public, private and global groups (global groups allow guests), friends and blocking, typing indicators and presence across devices. GraphQL handles reads and writes, Socket.IO the live events, and a Redis adapter lets it run as several instances. Chat verifies Core JWTs and copies profiles over RabbitMQ.
Project page: `/projects/rektstudios-chat`
## Kadence K-OINS, Kadence International
Architect and lead, Kadence International, full-time. Jan 2022 – Nov 2024. iOS, Android (App Store and Google Play)
Stack: NestJS microservices, MongoDB, RabbitMQ, Flutter, Xendit, AWS
Card: Online survey and panel app for Indonesia
A survey and panel app for Indonesia. Panelists are matched to surveys by demographics, with quotas enforced, and answer through a logic engine with 11 question types that can jump, disqualify or complete. They earn points and cash them out through Xendit. K-OINS runs on 4 services of a NestJS backend it shares with Kadence Kepo: the user service, which I built first, during Kepo, and the survey, point and contact services, which I built for K-OINS. The services talk to each other through RabbitMQ. I also built the Flutter app and the infrastructure. 18k panelists have registered and about 2k are active each month. The app is rated 4.2 on the App Store and 3.6 on Google Play.
Project page: `/projects/kadence-k-oins`
## Kadence Internal Tools, Kadence International
Lead Engineer, built the API, Kadence International, full-time. Jul 2024 – Oct 2024. Web
Stack: NestJS, MongoDB, BullMQ, Puppeteer, Next.js, AWS
Card: Expense platform for internal use
The company's expense platform. Each division is a workspace, so its claims stay private to it. Staff file purchase orders, reimbursements and settlements, then export a PDF. I led it as Lead Engineer and built the API. A teammate built the Next.js web app.
Project page: `/projects/kadence-internal-tools`
## Kadence Kepo, Kadence International
Lead Engineer, built the backend, the Android app and the upload page's API, and ran the infrastructure, Kadence International, full-time. Jul 2021 – Dec 2021. Android (outside the app stores), web dashboard, web upload page
Stack: NestJS microservices, MongoDB, RabbitMQ, Flutter, AWS S3
Card: Field-operation app for registered shoppers
Logo: the Kadence logo (`public/assets/brands/kadence.svg`); Kadence Kepo has no logo of its own
Kadence's field-operation app for its registered shoppers, built in about 6 months at the start of my time at Kadence. Only registered shoppers use it, so it has 1k–2k users. It ran 3 Kadence fieldwork projects at the same time, with shoppers uploading and recording at once, on a minimal server: 2 GB RAM, 1 vCPU and 50 GB of storage. With memory optimization, the app ran on that server. The app sends GPS to the API when a visit starts and when it is marked visited, and keeps photos, videos and audio on the phone until upload. It sends each file to the API in 50 MB chunks, and the API passes each chunk on to AWS S3 as one part. A failed upload is sent again from the start, with a retry button on each file. When the app's traffic is full, shoppers can upload in a browser on a separate web upload page. The Android app is distributed outside Google Play and the App Store. I led it as Lead Engineer. I built the backend, the Android app and the upload page's API, and ran the infrastructure. My teammate built the front end of the web dashboard and the web upload page, and a designer designed the UI. Kadence Kepo is a separate project from Field Operation Platform, my freelance field-operation app, and is not Kepo Solusi Indonesia, where I had my first backend role.
Project page: `/projects/kadence-kepo`
## Korner, freelance (legal consultation)
Fullstack Engineer, freelance. Oct 2023 – Apr 2024. iOS, Android (App Store and Google Play)
Stack: NestJS, MongoDB, Flutter, Next.js, Twilio, Xendit, Docker, GitHub Actions, AWS
Card: App for paid live legal consultations
Legal tech platform that connects people with lawyers for 30-minute live consultations, booked and paid in the app. Clients book and pay for 30-minute live consultations with lawyers. The chat room for a slot opens 5 minutes before it starts and closes itself when the time is up. A 10-minute cron sweep closes any session the chat webhook missed. A booking can carry a voice note of up to 5 minutes and PDFs, stored on S3. Live chat runs on Twilio Conversations. Xendit handles the invoices and payouts. I built the NestJS API, the Next.js admin dashboard, and the Flutter app for iOS and Android. The dashboard approves lawyers, reviews lawyers, and lists transactions. I recommended hosted chat and payments. The client chose Twilio Conversations and Xendit.
Project page: `/projects/freelance-korner`
## Field Operation Platform, freelance (market research, confidential)
Fullstack Engineer, freelance. Feb 2025 – Aug 2025. Web, Android
Stack: NestJS, MongoDB, Flutter, Nuxt.js, Vue.js, Vite, Vuetify, Agenda, AWS S3, Docker, GitHub Actions
Card: Market-research platform for field visits
Field agents receive tasks, capture photo, video and audio on visits, and send it to the operations team, often on a weak signal. Media stays on the device until the agent is connected. An in-app queue then uploads one file at a time straight to S3 in 30 MB chunks through presigned URLs, and a failed upload continues from the next unfinished chunk. Operations assign tasks and review the media in a Nuxt dashboard.
Project page: `/projects/freelance-field-operations`
## Gradana, Gradana Indonesia
Associate Fullstack Engineer, Gradana Indonesia, full-time. Mar 2020 – Jul 2021. Web, mobile
Stack: Microservices, Alibaba Cloud, Jenkins
Card: P2P lending platform
Gradana is a P2P lending platform. I split its live monolith into microservices in stages, on Alibaba Cloud infrastructure I designed, with Jenkins CI/CD and automated tests. The work supported OJK certification.
## MAP Loyalty System, Gtech Digital
Backend Engineer, Gtech Digital, full-time. Apr 2019 – Mar 2020. iOS, Android, web
Stack: REST APIs, NoSQL, MySQL
Card: Multi-tenant loyalty system for iOS, Android and web
Multi-tenant loyalty APIs for iOS, Android and web, with NoSQL and MySQL schemas tuned for loyalty transactions with high-frequency reads and writes.
## Vehicle Rental System, freelance (confidential)
Backend developer, freelance. Jan 2020 – Aug 2020. Web
Stack: Java, Vert.x, PostgreSQL, Git
Card: Web platform for vehicle rental
A web platform for vehicle rental: live vehicle tracking, rental orders, purchases and invoicing. I connected the tracking hardware, built the ingest from the IoT trackers into PostgreSQL for live vehicle status, and wrote the services for orders, purchases and invoices.
# Stack (stack.md: an extensions list)
Intro line: "The tools and standards I have shipped with, and the projects on this site that used them."
Only tools and standards that appear in `summary.md` or the project files, plus the owner-confirmed tools listed with no projects: Kafka, AWS Lambda, Nginx and Jira (owner, 2026-10-16). Each entry shows its logo in one colour (navy), its name, and the projects on the site that used it (from the project files), in the Projects dialog order. A list that does not fit on one line becomes a count, such as "7 projects" ("1 project" for a single name), which opens a list of that tool's projects with their logos and where each was done. Entries without a logo show their initials. Practices and concepts are listed under Skills, not here.
- **Languages and runtimes:** TypeScript, JavaScript, Node.js, SWC, Dart, Java
- **Frameworks:** NestJS, Flutter, Next.js, React.js, Vue.js, Nuxt.js, Vite, Vuetify, Vert.x, Puppeteer, Ethers
- **Data:** PostgreSQL, MongoDB, MySQL, Redis, Prisma, Mongoose
- **Messaging and real time:** RabbitMQ, Kafka, BullMQ, Agenda, Socket.IO, WebSocket, GraphQL, Apollo
- **Auth and access:** JWT, OAuth, TOTP, SIWE, Passport, CASL
- **Contracts and testing:** Zod, Swagger / OpenAPI, Jest, Vitest
- **Cloud and delivery:** AWS, AWS S3, AWS SES, AWS Lambda, Alibaba Cloud, Docker, Nginx, GitHub Actions, Jenkins, Pino
- **Services:** Sentry, Firebase FCM, thirdweb Engine, Alchemy, Moralis, Envio, Stripe, Xendit, Twilio, OneSignal, SendGrid
- **Planning:** Jira, Trello
Kafka, AWS Lambda, Nginx and Jira show their logo and name with no project list, like JavaScript: the owner has used them (owner, 2026-10-16), and no project on this site is stated as using them.
# Skills (written out, no logos)
Competencies and practices only, one row per group. Tools, libraries, protocols, standards and services appear once, under Stack, with the projects that used them. The CV (`summary.md`) keeps its own five groups, which mix tools and practices. Pub/sub and Sagas are on the CV and the site (owner, 2026-10-16); their source is the project files. Agile and Scrum are on the site only (owner, 2026-10-16): I worked in Scrum teams as a team member, never as Scrum Master, at Kadence International, Rektstudios, Gradana Indonesia and Gtech Digital. Design patterns is on the site only; its source is the repository pattern in the project files. Requirements analysis and Technical guidance are on the site only (owner, 2026-10-16). Message broker is in the CV's Expertise row; its site source is the project files (Kadence K-OINS, Kadence Kepo). The CV's Expertise order is packed to fit its page; the site groups its competencies by kind.
- **Expertise:** Software development, Backend development, Fullstack development, Mobile development, System architecture, System design, API design, Database design, Distributed systems, Message queues, Payment systems, Scalability, Performance optimization, Code review, Technical leadership, Technical guidance, Mentoring, Requirements analysis, Project coordination, Agile, Scrum
- **Architecture:** Monolith, Microservices, Event-Driven Architecture, Clean Architecture, Design patterns, REST APIs, Multi-tenant
- **Data and consistency:** Idempotency, Wallet ledger, Advisory locks, Compare-and-swap, Sagas, Query tuning
- **Security and auth:** RBAC, 2FA, Rate limiting
- **Real time and jobs:** Horizontal scaling, Pub/sub, Background jobs
- **Delivery and ops:** CI/CD, Automated testing, Cloud infrastructure design, Monitoring, Incident handling
# Education
Bachelor of Information Systems, E-Business. Bina Nusantara University (Binus). 2014 – 2018. GPA 3.3
# Languages
Indonesian (native), English (professional working proficiency)
# Contact
One box on top: "Open to Work" in green, then "Senior backend or lead engineer roles, remote. If you are hiring, email me."
Email is the primary action; the CV, LinkedIn and GitHub are secondary:
- Email: andrechristikan@gmail.com, with a button that copies the address and a "Hire Me" button
- CV: cv-no-photo.pdf, with a "Download CV (PDF)" button (`/assets/cv-no-photo.pdf`)
- LinkedIn: linkedin.com/in/andrechristikan
- GitHub: github.com/andrechristikan
- Website: andrechristikan.me
- Location: Jakarta, Indonesia. I work remotely. It sits under the email address.
# 404 page
Shown inside the editor shell for any address with no page. The server sends status 404 and the page is not indexed.
Approved by the owner (2026-09-28).
Page title: File not found, Andre Christi Kan
Description: No page on Andre Christi Kan's portfolio matches this address.
Tab and breadcrumb: "does-not-exist.md", a fixed name for every missing address, never the real path. Crumbs:
portfolio › does-not-exist.md. No explorer item is marked open, and there is no Source view. No caption above the heading.
This file does not exist
There is no file at this address in my portfolio. Start from README.md, or search the files by name.
Buttons: "Open README.md" (primary, `/readme`) and "Search files" (quiet button that opens the file search)