Abdurrahman Ramadhan

Software Engineer

Professional Summary

Senior Full-Stack Engineer with 7+ years building scalable fintech, Web3, and identity platforms across insurance, DeFi, and esports. Experienced in architecting multichain systems, OAuth2/OIDC identity platforms, risk monitoring engines, and high-availability APIs. Proven track record leading cross-functional teams from discovery to production with measurable improvements in reliability, security, and delivery velocity.

Skills

Languages: TypeScript, JavaScript, Go, PHP, Rust, Solidity

Frontend: React, Next.js, React Native, Vue.js, Nuxt.js, Tailwind CSS, React Query, GraphQL, Leaflet

Backend: Node.js, NestJS, Express.js, Laravel, Golang, WebSocket, Apache Kafka, gRPC, GraphQL

DevOps: Docker, Docker Compose, Kubernetes, GitHub Actions, Jenkins, Nginx, AWS, Google Cloud, Git

Blockchain: EVM, Aptos, Web3, Solidity, Web3 Wallet, DeFi, ERC-20/721/1155, CLMM/AMM/Stable Pool

Database: PostgreSQL, MySQL, MongoDB, Redis, MSSQL, Firebase, Database Design, Database Migration

Education

IPB University

Aug 2016 - Nov 2019

Bachelor's Degree of Computer Engineering | GPA 3.52

Experience

Undercurrent Capital Pte Ltd - Singapore (Remote)

August 2021 - Present

Software Engineer (Full-time)

Project Completed:

Carfren Insurance

Full-stack Engineer (Remote, Singapore)

Led development of end-to-end insurance workflows (quoting → claims → reporting)
Designed RBAC-secured APIs handling 50k+ policy records with Vue.js, Laravel, PHP, MySQL
Implemented async processing with queues, reducing claim processing time by 35%
Improved system reliability to 99.9% uptime via observability and CI/CD
Integrated 3rd-party services (payments, KYC, storage) reducing integration time by 50%

Gosugamers OAuth

Tech Lead / Project Manager (Remote, Singapore)

Architected centralized OAuth2/OIDC SSO platform serving 10+ apps with single user directory
Designed multi-tenant architecture with JWT/opaque tokens, MFA (TOTP/WebAuthn), and passwordless auth
Established HA/DR, rate limiting, DDoS protection reducing MTTR by 40%
Drove delivery with CI/CD, automated testing, monitoring achieving 99.9% uptime
Led integrations with game portals and internal services via SDKs/webhooks

Gosugamers Telegram App

Tech Lead / Project Manager (Remote, Singapore)

Architected Telegram Mini App for esports news, live matches, leaderboards with React, Next.js, Node.js
Designed modular backend with data ingestion pipelines and CDN reducing load times to 300 ms
Implemented real-time updates (WebSockets/event fan-out) for scores and brackets
Established observability, rate limiting, abuse protection achieving 99.9% uptime
Delivered CI/CD, infra-as-code, automated tests with performance budgets

Tapp Exchange

Full-stack Engineer (Remote, Singapore)

Built Go-based risk management service monitoring TVL, system health, pool liquidity reducing MTTR by 45%
Designed Rewards backend APIs (Node.js, MySQL) for social/trade tasks with anti-abuse/rate-limits
Delivered Rewards frontend (React, Next.js) with real-time status, wallet connect flows
Enforced security (input validation, authZ, replay protection) and performance (caching/batching)
Achieved 99.9% reliability with CI/CD, tests, observability, and rollbacks

Whitemane Web3 Wallet

Full-stack Engineer (Remote, Singapore)

Architected Web3 wallet for web2 users with email sign-in and automatic EVM wallet provisioning
Implemented Shamir's Secret Sharing (SSS) scheme for secure key management with threshold reconstruction
Built core wallet module (send/receive, balances, approvals, transaction history) with React, Next.js
Hardened stack with 2FA/recovery flows, encrypted storage, audit logs achieving 99% security compliance in internal audits
Delivered simple, safe wallet experience with clear UX around approvals and risk prompts

Otaku Web3 Crowdfunding

Tech Lead / Project Manager (Remote, Singapore)

Led end-to-end delivery of IP-licensed anime crowdfunding platform with React, Next.js, Node.js
Defined token economics and price-priority auction system with smart-contract flows for minting/vesting
Coordinated product/design/engineering, ran sprints achieving 95% on-time delivery
Oversaw architecture for wallet connectivity, KYC/AML gating, on-chain/off-chain services
Established security/compliance standards (audits, safelist transfers, treasury ops, audit trails)

Thetanuts Finance

Full-stack Engineer (Remote, Singapore)

Built DeFi staking, vesting, and vault experiences with Vue.js, EtherJS, Web3
Integrated smart contracts end-to-end (ABI/event subscriptions, allowance/approval flows, gas estimation)
Delivered stake/unstake and vest/claim interactions with real-time state and rewards/APY displays
Enforced security (input validation, chain/network guards) and performance (memoization, batching)

Avocado DAO

Full-stack Engineer (Remote, Singapore)

Created public landing experience and on-chain staking/vesting features with React, Next.js, Tailwind CSS
Integrated Web3 wallets (MetaMask/WalletConnect) and contract calls for stake/unstake with live balances
Handled allowances/approvals, gas estimates, error states with clear prompts and toasts
Added analytics and event-driven state reflecting on-chain updates in real time

DG NFT Marketplace

Full-stack Engineer (Remote, Singapore)

Designed multichain backend architecture ingesting NFTs across Ethereum, Polygon, Base, Arbitrum
Implemented resilient indexers, metadata normalization, asset caching reducing read costs by 30%
Built secure REST/GraphQL APIs for collections, items, ownership, activities, pricing
Delivered NFT Explore page with performant search, filters, sorting, pagination, real-time updates

DGV Omniplay

Full-stack Engineer (Remote, Singapore)

Built Telegram Mini App web3 wallet with customizable PFP generator and quest/achievement systems
Implemented wallet UX for sending/receiving funds, network/asset selection, transaction previews
Integrated Web3 providers and contract calls for state reads/writes with role/rule configuration
Delivered responsive Mini App with secure auth, rate-limited APIs, caching/CDN, analytics

Novustech Pte Ltd - Singapore (Remote)

June 2022 - November 2025

Software Engineer (Part-time)

Project Completed:

SoHigh Social Club App

Tech Lead / Full-stack Engineer (Remote, Singapore)

Solo delivered karaoke companion app (React Native, NestJS, MySQL) with end-to-end architecture
Built responsive mobile UI/UX where guests scan QR to join sessions, queue songs serving 5k+ users
Implemented gifting and in-app economy (buy gems, spend on songs/boosts) processing 2k+ transactions/day
Shipped F&B ordering integrated with venue printers/KDS, leaderboards, achievements, real-time updates
Owned CI/CD, IaC, monitoring/alerting, backups achieving 99.9% uptime across 2 venues

Partyinkers Web App

Full-stack Engineer (Remote, Singapore)

Built platform (Laravel, PHP, MySQL) for creating and customizing party invitations and stationery
Delivered design templates, customization options, and printing services integration

Tixbite

Full-stack Engineer (Remote, Singapore)

Developed event ticketing platform (Next.js, NestJS, MySQL, Stripe) enabling ticket buy/sell
Implemented secure payment processing and transaction management

Tixflare

Full-stack Engineer (Remote, Singapore)

Developed event ticketing platform (Next.js, NestJS, MySQL, Stripe) enabling ticket buy/sell
Implemented secure payment processing and transaction management

Culturcoin

Full-stack Engineer (Remote, Singapore)

Built blockchain token platform (Next.js, Tailwind CSS) celebrating culture through games, TV shows, films
Integrated Uniswap, DexTools, Wallet Connect for token trading and management

AgentYP

Full-stack Engineer (Remote, Singapore)

Built AI agent platform (Next.js, Tailwind CSS) on Virtuals for AI collaboration and assistance

GamingGrid Landing Page

Frontend Engineer (Remote, Singapore)

Developed landing page for gaming platform

Landed Pro

Full-stack Engineer (Remote, Singapore)

Built comprehensive portal for Singapore's landed homes with property listings and search

PT Qiblat Indonesia - Indonesia (On-site)

November 2019 - August 2021

Software Engineer (Full-time)

Project Completed:

Yo! Invest

Full-stack Engineer (On-site, Indonesia)

Built production-grade Reksa Dana (mutual fund) application with PHP, Laravel, React Native, Docker
Designed and optimized backend systems ensuring high performance, security, reliability
Developed scalable APIs, managed database integrations (MySQL, MSSQL) on Google Cloud
Implemented robust error handling supporting 50k+ users and 10k+ transactions/day
Achieved 99.9% uptime ensuring smooth, uninterrupted operations in production