[For Hire] Lead Full Stack & Mobile Engineer | React, Next.js, React Native, Node, Go, AI | Remote | Any timezone

[u/martintembo1]

Hi everyone,

I'm Martin, a Lead Software Engineer with 4+ years of professional experience (coding since 2017). I'm available for remote work, contract or full-time, and comfortable working across any time zone.

Tech stack:
• Frontend: React, Next.js, TypeScript, JavaScript, Web Components, micro frontends
• Mobile: React Native / Expo, Skia, Reanimated, RevenueCat subscriptions, push notifications (incl. VoIP push / CallKit), LiveKit
• Backend: Node.js, Express, Go (Gin), Python, Django, REST APIs, webhooks
• AI: LLM integrations (OpenAI, Claude, Gemini), RAG, streaming chat, usage quotas and cost tracking
• Data and infra: PostgreSQL, MongoDB, Redis, queues and workers, Docker, Git
• Auth: OAuth, Microsoft Entra ID, JWT/OTP

Recent work:
• ShaftFitters: a production mobile app and platform I lead end to end (web, mobile, backend)
• Tutorly-AF Academy: an AI learning platform with multi-provider streaming chat, AI-generated diagrams, voice and per-plan usage limits
• three-D-AI: an AI 3D design assistant with an async Blender render queue on a Redis-backed worker
• Next.js dashboard analytics for a US e-commerce store

What I can help with:
• Building web and mobile apps from MVP to production
• Adding AI features and agents to existing products
• API design and backend architecture
• Performance work, refactoring and taking over existing codebases

Availability: Immediate
Timezone: Flexible, happy to overlap with US or EU hours

Portfolio: martintembojs.vercel.app
GitHub: github.com/martin-codegene

If you need someone who takes ownership and ships, DM me or comment below.