Looking for a job

Jay Stance

@jaystance

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I build secure, auditable fintech platforms and large React systems from architecture through production support.

Nigeria

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What I'm looking for

I'm looking to build secure, high-impact fintech, payments, healthcare, or AI products end to end, with ownership of architecture, production quality, and reliable customer outcomes.

At Adrro, I'm the sole engineer building a multi-tenant platform for small-business marketing and customer conversations. I built its API, 98-table PostgreSQL model, background processing, and Next.js/TypeScript frontend, backed by 2,700+ automated tests.

I build payment systems where retries never double-charge and every state change is traceable. At Adrro and Tachpae, I've implemented Paystack payments, HMAC-verified webhooks, idempotency keys, append-only audit logs, tokenization, encryption, and OTP-verified payout flows.

I founded Tachpae and built its Node.js payment backend and React Native apps from scratch, shipping an early prototype in seven days and improving backend response times by roughly 30% with Redis caching. I now own its product requirements, architecture, technical roadmap, code reviews, and engineering mentorship.

I've also architected an eight-app medical-records monorepo at Springbok and shipped mobile and full-stack products for clients. I work end to end across Node.js, Python, TypeScript, React, PostgreSQL, Redis, AWS, CI/CD, observability, and production support.

Experience

Work history, roles, and key accomplishments

Current

Founder & Lead Engineer

Current

Adrro

Jan 2025 - Present (1 year 8 months)

Sole engineer on a multi-tenant platform for marketing and customer conversations, built end to end with API layer, PostgreSQL data model, background processing, and Next.js/TypeScript front end. Implemented payment paths with Paystack, HMAC-verified webhooks, idempotency keys, and append-only audit log.

Python fastAPI PostgreSQL Celery Redis Next.js TypeScript Paystack OpenTelemetry Sentry CI CD

Current

Founder & Engineering Lead

Current

Tachpae Technologies

May 2024 - Present (2 years 4 months)

Built payments platform from scratch with Node.js backend and React Native apps, shipping a working prototype in 7 days. Designed payment security layer with HMAC signing, AES-256-CBC encryption, tokenization, certificate pinning, and rate limiting.

NodeJS PostgreSQL Redis gRPC React Native Docker AWS HMAC AES 256 CBC Tokenization Rate limiting

Current

Freelance Full-Stack Engineer

Current

Independent Clients and Upwork

Jan 2020 - Present (6 years 8 months)

Delivered Skillsi, a full-stack e-learning platform with Admin, Tutor, and Affiliate dashboards, bank account tokenization, and OTP payout verification. Built AmbleVerse end to end with role-based access, streaks engine, and CI/CD.

React TypeScript NodeJS Express MongoDB PostgreSQL Redis S3 GitHub Actions

Lead Mobile Developer

KudiSMS

Feb 2024 - Mar 2025 (1 year 1 month)

Took an in-progress React Native/TypeScript app to shipped in 3 weeks, integrating multiple microservice backends over REST with different auth mechanisms and data contracts. Worked in an agile team with backend, QA, and design on two-week release cycles.

React Native TypeScript REST APIs Agile

Co-founder & Lead Engineer

Springbok Technologies

Mar 2022 - Present (4 years 6 months)

Architected LCU EMR, a multi-tenant electronic medical records platform, as a Turborepo monorepo of 8 role-specific React/TypeScript apps and 5 shared packages. Used TanStack React Query v5 for server state and built a typed API gateway package.

React TypeScript React Query TurboRepo Zustand API Gateway