Fullstack Engineer • 6+ Years
Alvin Theofilus Sutikno
Designing, building, and deploying production-grade web and mobile applications across fintech, AI, and enterprise messaging.
React • Next.js • Node.js • NestJS • Flutter • AI / RAG • DevOps
Skills & Technologies
Technologies I work with daily to build production systems.
Professional Experience
Professional journey building software across fintech, AI, and enterprise.
Senior Software Engineer @ Qonflo
Oct 2025 - Present • Contract
- Led a dual-architecture V1 to V2 refactor, modernizing the codebase for scalability and maintainability
- Designed and built an internal workflow automation engine (n8n-style) with reusable components and full audit logging, triggered by incoming WhatsApp webhooks and executed asynchronously via BullMQ and Redis workers
- Built real-time chat and live updates via WebSocket integration, and designed role-based access control (RBAC) end-to-end
- Built backend services for a multi-tenant WhatsApp Business API platform (including WhatsApp Coex API), handling real-time two-way message processing via official endpoints and webhook integration across concurrent enterprise clients
- Deployed and managed production infrastructure on GCP using Docker Swarm, achieving zero-downtime deployments to ensure reliable message delivery for enterprise clients
Fullstack Engineer @ VeloxAI
May 2025 - Oct 2025 • Contract
- Built a NestJS REST API with a RAG pipeline (OpenAI Agents SDK, vector stores, OCR) for AI-powered financial document analysis
- Developed automated trading-signal systems and AI chatbot integrations using OpenAI APIs, Zapier, WATI, vector databases, and Puppeteer-based scrapers to analyze market sentiment, news, and real-time forex/price action
- Delivered a Next.js 15 SSR web dashboard with integrated Mixpanel platform analytics to track user behavior and support data-driven product decisions
- Shipped a cross-platform Flutter app (Android/iOS) covering trading signals, financial goals, and an AI chatbot, integrated with the Firebase ecosystem (Auth, Firestore, FCM, Analytics) and WhatsApp API for multi-channel notifications
- Designed the PostgreSQL database schema and deployed the full platform to production across API, web, and mobile
Software Engineer @ camLine
Jul 2022 - Feb 2025 • Full-time
- Built and maintained interactive data visualization dashboards in React and Plotly.js, engineered to render and interact with datasets of 10,000+ records while maintaining sub-second responsiveness
- Designed and maintained backend REST APIs with Spring Boot to power core dashboard functionality
- Implemented automated end-to-end test suites with Cypress and Selenium, significantly reducing regressions and strengthening long-term product stability
- Led performance optimization efforts across frontend and backend, conducted code reviews, and upheld overall product reliability
- Led sprint ceremonies and authored product documentation to support cross-team alignment
Android Developer @ Davinti Group
Aug 2019 - Jun 2022 • Full-time
- Developed and shipped Android applications in Java and Kotlin, translating design mockups into responsive, pixel-accurate user interfaces
- Integrated backend REST APIs and authentication flows to power core application features
- Implemented third-party SDKs including Mapbox, Firebase Cloud Messaging, and Google Sign-In across multiple production applications
- Ensured compatibility and stability across a wide range of device screen sizes and Android OS versions
Featured Projects
Selected work showcasing architecture, scale, and impact.
Workflow Automation Engine
QonfloBuilt an n8n-style internal workflow automation engine with reusable components, full audit logging, and async execution via BullMQ workers triggered by WhatsApp webhooks.
- ▸ Multi-tenant WhatsApp Coex API
- ▸ Zero-downtime GCP deployment
- ▸ RBAC end-to-end
AI Financial Document Analysis
VeloxAIBuilt a RAG pipeline for AI-powered financial document analysis, plus automated trading-signal systems analyzing market sentiment via OpenAI APIs and web scrapers.
- ▸ RAG + Vector stores
- ▸ Next.js 15 dashboard
- ▸ Flutter cross-platform app
Interactive Data Dashboards
camLineEngineered data visualization dashboards rendering 10K+ records with sub-second responsiveness. Designed REST APIs in Spring Boot and automated E2E test suites.
- ▸ Sub-second 10K+ records
- ▸ Cypress + Selenium E2E
- ▸ Performance optimization
Omagadtopup
Personal ProjectFully automated online store selling in-game currencies. End-to-end from order to delivery.
- ▸ Full automation
- ▸ Production since 2023
Imfos Mart
Personal ProjectAndroid app for pharmacies to manage medicine orders and real-time delivery tracking.
- ▸ Order management
- ▸ Live delivery tracking
- ▸ Mapbox integration
Get In Touch
I'm currently open to contract opportunities and interesting projects. Let's build something great together.