Internship Full-Stack Engineering Intern

Finprojections, a Singapore startup finance advisory firm building an AI-native CFO office, is hiring a Full-Stack Engineering Intern to help build and ship Founder's Tool — a live production web app used by startup founders and their investors to consolidate financials, forecasts, cap tables, valuation comparables and AI-driven insights. The intern will work on an existing codebase across front-end React, back-end Node.js/Express services and MCP integrations, shipping features to production.

Responsibilities:

• What you'll work on:
• Web app (React): build and polish screens for financials, the cap table, valuation comps, cash flow and the in-app AI chat.
• Backend (Node.js, Express): add API routes, data models and database migrations, and keep the Xero and Google Sheets connections reliable.
• MCP server: build the tools Claude uses to read and update a company's data, with investor access controls.
• Integrations: Xero and Google Sheets, Drive and Docs APIs, plus AI features built on Gemini and Claude.
• Deployment: ship to Railway and Neon, monitor background refresh jobs, and fix production issues.
• Quality and security: write tests, set up automatic test runs (CI) on GitHub, and help prepare for client security reviews.

Requirements

• What you need:
• Solid TypeScript or JavaScript, with React on the front end and Node.js on the back end.
• SQL and a relational database, ideally PostgreSQL.
• Everyday Git and GitHub: branches, pull requests and code review.
• Experience deploying at least one app and keeping it running (Railway, Render, Vercel, Fly.io, AWS or similar).
• Working grasp of REST APIs, sessions and OAuth sign-in flows.
• Ability to open an unfamiliar large codebase (60,000+ lines) and explain its structure quickly.
• Willingness to learn finance concepts (P&L, forecast, cap table).

• Nice to have:
• Prisma, Vite or Express.
• Experience building with LLM APIs (Gemini, Claude or OpenAI), function calling, or the Model Context Protocol (MCP).
• Third-party APIs such as Xero, Google Workspace or Stripe.
• Background job queues and scheduled tasks.
• Setting up CI with GitHub Actions.
• Coursework or interest in finance, accounting or startups.

• Internship details:
• Location: Remote
• Duration: 3 months
• Start date: November 2026
• Hours: Full-time, Monday to Friday

• How to apply:
• Email [email protected] with the subject "Full-Stack Intern – Founder's Tool" and include: 
• Your CV; Your GitHub profile; A link to an app you built and deployed; Three to five sentences on the hardest bug you fixed in a deployed app and how you found it.

Skills

TypeScript, JavaScript, React, Node.js, Express, SQL, PostgreSQL, Git, REST APIs, GitHub Actions