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nellylemmy/README.md

Nelson Lemein

Founder & CEO at KEPAS TECHNOLOGIES. Engineer first, executive second. I build distributed systems for African fintech and SaaS — code that has to be right because the money is real.

Nairobi, Kenya · Available for technical advisory and infrastructure-heavy contracts


What I'm building

Project Domain Stack
KEPAS Pay M-Pesa payment gateway powering every KEPAS product (single Daraja registration, multi-tenant, double-entry ledger, auto-sweep platform fees, in-app reversal flow that mirrors Safaricom's customer-care model) Node.js · Express · PostgreSQL · Redis · Docker
Tumakesh Consumer wallet on top of KEPAS Pay — send/receive money, P2P transfers, reversal request flow with 60-minute server-enforced eligibility window React · Vite · TanStack Query · PostgreSQL
Wabi Real-time messaging gateway with end-to-end delivery guarantees Node.js · Dart (Flutter) · Redis
Sinro IDE An opinionated multi-agent coding environment TypeScript

A working 1.0 ships before a buggy 2.0. Optimization, architecture, latency — in that order.

Open work

  • talktime-video-app — self-hosted video calling platform with coturn TURN, volunteer scheduling, admin dashboard.
  • More to come: I'm carving out sanitized slices of the KEPAS infrastructure to publish — the Safaricom Daraja integration patterns in particular are worth open-sourcing.

How I work

  • Technical Truth over marketing fluff — I'll explain the latency before I explain the value prop.
  • Roadmap discipline — Q3 means Q3. Vaporware is a moral failure.
  • 80/20 on performance — 20% of the code drives 80% of the cost; I optimize that and ignore the rest.
  • Calm in crisis — apologies come in the form of a root-cause analysis, not an adjective.

Stack I lean on

Node.js · PostgreSQL · Redis · Docker · KAFKA · Daraja API (M-Pesa) · React · Vite · Express · TypeScript · Dart/Flutter · Bash · Curl · Cloudflare Tunnels · HTML · CSS · Next JS · Bun · Python · Go · Rust

Contact

  • Web — kepas.co.ke
  • Mail — nelsonlemmy61@gmail.com
  • Status — Open to deep infrastructure work, fintech architecture reviews, and Daraja integration consulting.

Pinned Loading

  1. daraja-js daraja-js Public

    Type-safe Node.js/TypeScript SDK for Safaricom Daraja (M-Pesa). Encodes 14 production-tested gotchas. Apache 2.0.

    TypeScript 1

  2. talktime-video-app talktime-video-app Public

    Self-hosted video calling platform with coturn TURN, volunteer scheduling, and admin dashboard. Built for English-conversation practice with Maasai students.

    JavaScript 1

  3. ui-ux-pro-max-skill ui-ux-pro-max-skill Public

    Forked from nextlevelbuilder/ui-ux-pro-max-skill

    An AI SKILL that provide design intelligence for building professional UI/UX multiple platforms

    Python

  4. graphify graphify Public

    Forked from safishamsi/graphify

    AI coding assistant skill (Claude Code, Codex, OpenCode, Cursor, Gemini CLI, GitHub Copilot CLI, OpenClaw, Factory Droid, Trae, Google Antigravity). Turn any folder of code, docs, papers, images, o…

    Python

  5. AfriTeVa-keji AfriTeVa-keji Public

    Forked from castorini/AfriTeVa-keji

    Python

  6. kimi-cli kimi-cli Public

    Forked from MoonshotAI/kimi-cli

    Kimi Code CLI is your next CLI agent.

    Python 1

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