# Kofi Frimpong Software Engineer — Full-Stack, AI Systems & Platform Architecture Remote · Accra, Ghana +233 54 463 6910 · noeljoel61@gmail.com · kofnet.vercel.app linkedin.com/in/kofi-frimpong-0071281b7 · github.com/kofnet002 --- ## Summary Full-stack and AI systems engineer with **5+ years** building production software for African fintech, civic-tech, and SaaS — most of it as the person owning technical direction at early-stage companies, and is co-founder and CTO of MySapienta. Architected and built a **15-service event-driven platform in Python/FastAPI as sole engineer**, and engineers NestJS and gRPC microservices on a multi-tenant platform serving nine products. Ships **LLM systems in production**: a GPT-4o agent extracting structured investment records from live email, three complementary retrieval systems (Pinecone semantic search, LlamaIndex RAG with citations, Gemini File Search), and real-time speech pipelines. Equally at home in TypeScript and Python, from schema and infrastructure through to the React/Next.js interface that consumes it — including the observability, migrations, and production incidents nobody volunteers for. --- ## Technical Skills **Languages** — TypeScript, Python, SQL, JavaScript **AI & LLM** — OpenAI GPT-4o, Google Gemini, LlamaIndex RAG, Pinecone vector search, semantic retrieval, agentic extraction pipelines, Deepgram speech **Backend** — Node.js/NestJS, Express, FastAPI, Django/DRF, gRPC, WebSockets, REST, Celery, BullMQ, event-driven architecture **Data** — PostgreSQL, MongoDB, Redis, Apache Kafka / Redpanda, Prisma, Drizzle, SQLAlchemy, Alembic, Pinecone **Frontend** — React, Next.js, React Native (Expo), Redux Toolkit, TanStack Query, Tailwind, Vite, Module Federation **Cloud & CI/CD** — Docker, Kubernetes, Terraform, AWS (EKS, S3), ArgoCD, GitHub Actions, PM2, DigitalOcean, MinIO **Reliability** — OpenTelemetry, Prometheus, Grafana, OpenSearch, Loki, Sentry, structlog **Testing** — pytest, Hypothesis (property-based), testcontainers, Playwright, Vitest, Jest, k6 --- ## Professional Experience > One full-time role, a company I co-founded, and contract engagements that ran in > parallel — all of it with the clients' knowledge. ### Digiits Agency — Software Engineer **March 2026 – Present · Full-time · Accra, Ghana** Engineer on a multi-tenant platform powering nine products, plus dedicated product teams for fintech and events clients. - Work across **Polaris**, a multi-tenant platform serving **9 products from 33 shared domain modules** — NestJS + gRPC microservices, Apache Kafka event bus, PostgreSQL with schema-per-service isolation, SpiceDB relationship-based access control, and React micro-frontends composed via Module Federation. - Built the **G-Money financial services admin console** end-to-end — now the operational tool for **8,200+ mobile money customers** (98.5% active, ~774 new per month) — covering customer management, transaction monitoring, RBAC, audit logging, feature flags, maintenance mode, and CSV/PDF export. - Instrumented **OpenTelemetry distributed tracing across 15+ microservices** and built a transaction-error indexing pipeline into OpenSearch with Grafana dashboards, plus Winston-to-Loki structured logging with sensitive-data masking on financial paths. - Migrated the audit-log subsystem from PostgreSQL to OpenSearch, and added admin session management with suspicious-activity detection. - Shipped **two complete frontends for Xplora in under four weeks** — an admin/organiser dashboard and an 18-phase consumer app spanning feed, stories, ticket purchase, live voting, and social matching — alongside backend work on promotions, QR-based door check-in, and Paystack payments. - Delivered **7 modules of a supermarket POS/PWA** (inventory, CRM, procurement, reports, audit, users, admin), documented 30+ platform defects with reproductions, then fixed them myself in the shared platform the following cycle. - Built **GitHub App integration v2** for the Opero product — connect wizard, webhook validation, and PR-to-task linking with webhook-driven status transitions. --- ### Jampolls (formerly Votitude) — Lead Frontend Engineer **August 2021 – October 2024 · Contract** Lead engineer on the client application across two products over three years, authoring **1,165 of 1,461 commits** on the main repository. Platform carries **5,647 responses across 678 interactive sessions**. - Built **five product surfaces end-to-end** — Quick Polls, Anonymous Q&A, Surveys, Quizzes, and real-time multiplayer Trivia — each from empty state to production. - Engineered **real-time multiplayer Trivia over WebSockets**: room join and reconnect, countdown timers that stay synchronised across page refresh, mid-game join with full state resync, session-token rotation on rejoin, and automatic recovery that removed the manual retry path entirely. - Designed and shipped **Jam Sessions**, a live presenter mode enforcing a single-running-tool invariant, with QR join overlays, host-to-presentation-tab mirroring via BroadcastChannel, and resilient reconnection with state recovery. - Built a **survey engine supporting 8+ question types** with conditional branching, IndexedDB draft persistence, a three-tier authentication fallback chain (invitation code → anonymous → access token), and CSV/ZIP export. - Implemented **subscription gating across every creation and submission flow** — duration caps, response limits, live-participant limits, and Pro-tier export gating. - Established the **Playwright E2E suite and CI pipeline**, personally authoring the polls, survey (15 tests), quiz (17 tests), and Q&A suites within a 117-test harness. - Patched **CVE-2025-55182** via a Next.js 14→15 upgrade; added Sentry instrumentation and full technical SEO. - Earlier, as **Votitude**, the company's elections and awards product since merged into Jampolls: built the frontend from the first commit — Paystack and MTN Mobile Money payments, CSV/XLSX voter-roll upload with duplicate detection, live WebSocket vote tallies with animated counters, and the full v2 UI/UX rebuild. --- ### MySapienta — CTO & Co-Founder **October 2025 – Present · Self-employed** Co-founded MySapienta and own its technical direction as CTO. A 7-application school management platform; **~89,700 lines contributed to the backend API** plus two frontends owned end-to-end. Express + Drizzle ORM + PostgreSQL + Redis + BullMQ, Turborepo monorepo. - Rewrote the **timetable generation engine as a bounded backtracking constraint solver** — a 1.5-second wall-clock deadline and placement-attempt budget checked on a bitmask interval, a viability pre-check that skips full search when it cannot succeed, per-class double-block budgeting, and graceful degradation to best-effort greedy placement. Shipped with a dedicated stress-test harness and scenario/edge suites. - Built **WhatsApp notification infrastructure** from scratch — provider layer, template management, per-recipient WhatsApp-first routing, and silent automatic fallback to SMS when WhatsApp credits are exhausted, so delivery never fails visibly to a school. - Built the **student portal end-to-end** across three phases: classes, grades with continuous assessment, attendance heatmaps, schedule, academic calendar, announcements, library, achievements, and a fee-payment flow backed by a payer abstraction allowing students to settle their own invoices. - Built the **guardian parent portal end-to-end**: multi-ward switching, attendance with absence justification, fees and receipts, PDF term reports, timetables, and 2FA OTP sign-in. - Currently shipping **student check-in/check-out** — backend, attendance sync, guardian notifications, and a verified-collector checkout flow ensuring a child is released only to an authorised adult. - Made the applications installable: service worker with background auto-update and a school-branded post-login PWA install prompt. --- ### My Creativity Box — Full-Stack Engineer **November 2024 – January 2026 · Contract · New Zealand (remote)** Engineer across three products for a New Zealand-based studio. Principally **Spok**, a venture capital fund management platform where I was top contributor on both repositories (458/714 backend commits, 252/769 frontend) — NestJS + Nx, PostgreSQL/Prisma, React + Vite. - Built an **AI email agent** ingesting investment email over a persistent, health-monitored IMAP connection, using **GPT-4o to extract** companies, founders, valuations, and round terms into structured records with confidence scoring, semantic company matching, and duplicate prevention. - Implemented **three complementary retrieval systems**: Pinecone semantic search with live index synchronisation on every write, **LlamaIndex company-scoped RAG returning document and section citations**, and Gemini File Search with rate limiting and migration tracking. - Built a **mark-to-market valuation engine** with multi-currency conversion driven by a scheduled Wise exchange-rate job. - Shipped an **AI reporting suite across four phases** — filtered configuration, generation history, Excel and landscape-PDF export, and conversational regeneration with inline editing. - Executed a **full Firebase-to-PostgreSQL migration**, including file relocation to object storage and cross-system relation remapping. - Resolved recurring production deployment failures by making the entire Prisma migration chain idempotent, and hardened document processing with size, page-count, and media-type guards after container crashes. - Contributed to **Pactify.ai** ([pactifyai.com](https://www.pactifyai.com/)), an AI-assisted IP licensing platform — agreement drafting, recurring-event scheduling, and real-time calendar sync with external providers. React, TypeScript, Firebase, Stripe, and a Python service layer. - Contributed to **Purposely.ai** ([purposely.ai](https://www.purposely.ai/)), an AI ad-generation platform for marketers — a GraphQL monorepo with Relay and Prisma on AWS, where keeping schema in sync between backend and frontend was the central engineering problem. --- ### Adesua — Full-Stack Engineer **August 2025 – March 2026 · Contract** Sole engineer on a WASSCE exam-preparation platform — Django/DRF backend with a Next.js frontend, 326 commits across both repositories. ### Stimuluz — Frontend Engineer **November 2025 – February 2026 · Contract** Ghana govtech: a municipal revenue collection system (property registration, valuation appeals, commercial transport licensing) and a firearm licensing platform with application workflow, document upload, and officer review with role-based access. --- ## Selected Projects ### myBesorah — Architect & Sole Engineer **April 2026 – August 2026** · Church giving and member-engagement platform for Ghana — an event-driven payments system - Architected and built an **event-driven platform of 15 services and 5 Celery workers** in **Python 3.13 / FastAPI**: API gateway, giving, billing, collector, admin, audit, reporting, webhook handler, notification router, and a MongoDB change-stream watcher. - **Polyglot persistence chosen per workload**: PostgreSQL via async SQLAlchemy/asyncpg with Alembic migrations, MongoDB via Motor with change streams, Redis for cache and queues, MinIO for object storage, Kafka (Redpanda) as the event bus. - Wrote **1,540 Python tests across 142 files** — pytest-asyncio, **Hypothesis property-based testing** on money and payment paths, and **testcontainers** for real-dependency integration tests — plus 71 frontend test files. - Built a **mock payment service provider** making the full payment lifecycle — settlement, reconciliation, receipt generation, recurring giving, rollover — deterministically testable end-to-end without a live PSP. - Implemented **WebAuthn passkey authentication** with Argon2 hashing; enforced security in CI via Ruff's bandit ruleset alongside strict mypy. - Instrumented with **OpenTelemetry, Prometheus, Grafana, and structlog**; provisioned via **Terraform and Kubernetes**. - Delivered four TypeScript frontends (member PWA, admin, platform, apply) from a shared design system and a generated TypeScript SDK. ### Friday — Real-Time Meeting Intelligence **April 2026 – June 2026** Python/FastAPI backend streaming audio to **Deepgram over WebSockets** for live transcription, with an LLM-driven question-detection pipeline that surfaces questions directed at the user in real time. Turborepo monorepo with a React web client and shared prompt/type packages. --- ## Leadership & Community ### PyClub — Co-Lead **University of Cape Coast** Co-led a Python learning community for tertiary students, running **20+ events and workshops** with fellow leads to build a sustained community of Python developers. ### Information & Technology Coordinator **University of Cape Coast · 2022 – 2023** Supervised a team building **Votehub**, an e-voting platform for the faculty Dinner & Awards night. --- ## Education **University of Cape Coast** — Cape Coast, Ghana **BSc Computer Science** · 2020 – 2024 --- ## Certifications - **Google IT Automation with Python** — Professional Certificate (Coursera) Crash Course on Python · Using Python to Interact with the Operating System · Introduction to Git and GitHub · Troubleshooting and Debugging Techniques · Configuration Management and the Cloud - **Meta** (Coursera) — Django Web Framework · Building Web Applications in Django · Web Application Technologies and Django · APIs · Introduction to Databases for Back-End Development - **Google IT Support** — Technical Support Fundamentals ---