Full Stack Engineer · AI & Blockchain

Joy Chepkoech

I design and ship end-to-end products at the intersection of AI, blockchain and beautiful engineering.

Nairobi, Kenya GitHub LinkedIn
Portrait of Joy Chepkoech, full stack engineer based in Nairobi

4+

Years building

3

Engineering roles

2

Hackathons won

10+

Shipped products

About

Engineering with intent.

Full stack engineer with a BSc. in Computer Science from the Catholic University of Eastern Africa, with hands-on experience building and shipping end-to-end web applications. I'm drawn to AI-integrated, production-ready products that solve real problems across African and emerging markets — from national satellite tracking systems to on-chain financial trust infrastructure.

BSc. Computer Science

Catholic University of Eastern Africa

2022 — 2026

Data Science Professional Certificate

Coursera · IBM

2024 — 2025

Python for Machine Learning

Udemy

2023 — 2024

Experience

Where I've shipped.

Product teams across AI infrastructure, government space systems and on-chain finance.

Jan 2025 — Present

Africa Product Peers

Full Stack Engineering Fellow

VettedAI platform · MCP infrastructure

  • Led resolution of critical Candidates Pipeline issues, tracing data-flow bottlenecks between frontend and backend and restoring reliable candidate status updates across the recruiter dashboard.

  • Owned the MCP Quota Observability system end to end — real-time interfaces tracking AI tool consumption against usage quotas, giving the team visibility to prevent service disruption.

  • Delivered MCP Connectors for AI tool integration, standardising communication with external AI services and cutting onboarding effort for future integrations.

  • Maintained the CI pipeline and reviewed pull requests across the MCP Server codebase, resolving cross-environment build failures for consistent staging and production deploys.

  • Led a Vercel environment-variable security hardening initiative, eliminating secret exposure risk and establishing a secure variable workflow adopted team-wide.

Sep 2025 — Feb 2026

Hausor Labs

Full Stack Engineer

Qova Protocol · Base L2

  • Built Qova Protocol — financial trust infrastructure enabling AI agents to build, verify and leverage on-chain reputation scores on Base L2.

  • Contributed across a TypeScript SDK, a 21-endpoint REST API (Hono + Bun), a Next.js reputation dashboard and a Python SDK, backed by 264 automated tests.

  • Shipped 7 Solidity contracts — ReputationRegistry, TransactionValidator, BudgetEnforcer, QovaCore — deployed to Base Sepolia and SKALE, with Chainlink CRE workflows for live scoring.

  • Led integration support for LangGraph, CrewAI and n8n so developers could embed reputation scoring and budget enforcement into agent workflows.

May 2025 — Jul 2025

Kenya Space Agency

Software Engineering Intern

Nyota · National reentry tracking

  • Contributed to Nyota, a national satellite reentry tracking and visualisation system commissioned to strengthen space situational awareness at government level.

  • Owned the React frontend: interactive real-time orbital maps with Leaflet.js and Satellite.js, rendering live TLE streams from NORAD and the Space-Track API.

  • Owned the data integration layer to the ML prediction modules, establishing contracts for orbital decay forecasts and reentry corridor outputs with low-latency updates.

  • Represented the frontend in design reviews and sprint planning, unblocking integration issues to land the full system inside the three-month window.

Selected work

Products, protocols and platforms.

A selection of systems I've built — from AI-powered earth observation to on-chain reputation infrastructure.

Expertise

The toolkit.

Frontend

  • React · Next.js
  • TypeScript
  • Tailwind CSS · shadcn/ui
  • TanStack Query & Router
  • Leaflet.js · Satellite.js
  • Framer Motion

Backend

  • Python · FastAPI
  • Node.js · Bun · Hono
  • REST & JSON-RPC APIs
  • PostgreSQL · Supabase
  • Kafka event streaming
  • Auth, RLS & rate limiting

AI / ML

  • TensorFlow · scikit-learn
  • OpenCV · GeoPandas · Rasterio
  • LLM integration & prompt tooling
  • Agent frameworks — LangGraph, CrewAI
  • MCP servers & connectors
  • Model evaluation & observability

Blockchain

  • Solidity · Foundry
  • Base L2 · SKALE deployments
  • Chainlink CRE workflows
  • ERC-8004 · x402 · A2A
  • Circle Arc · USDC settlement
  • Contract testing & gas profiling

DevOps & Tooling

  • Git · GitHub Actions CI
  • Docker · Vercel · Railway
  • Environment & secret hardening
  • Vitest · Pytest · Forge tests
  • Monitoring & quota observability
  • Code review & release workflow

Ways of working

  • End-to-end product ownership
  • Agile sprints & design reviews
  • Technical documentation
  • Cross-team integration support
  • Mentoring & community leadership

Recognition & leadership

Awards and community.

Two national hackathon wins, and two years leading developer communities in Nairobi.

Nov 2025 · Nairobi

Winner — AI Genesis Hackathon

PayStream, an autonomous financial agent managing the full payroll lifecycle — analysing data, enforcing compliance, applying smart contracts and executing on-chain payments.

May 2024 · Nairobi

Winner — Build with AI Hackathon

Verbify AI, a text-to-speech assistive tool supporting individuals with speech difficulties.

2024 — 2025

Lead — Google Developer Groups, CUEA

Grew a developer community through technical events, workshops and hackathons, and managed sponsor and partner relationships.

2024 — 2025

Lead — Innovation Hub, CUEA

Directed innovation projects, mentored early-stage startups and built partnerships with industry and academic stakeholders.

Contact

Let's build something worth shipping.

Open to full stack engineering roles, AI product collaborations and blockchain infrastructure work. I usually reply within a day.

joychepkoechlangat@gmail.com