Senior Fullstack Fintech Distributed Systems Engineer

JOEL AJIDE ADEMOLA

Senior Fullstack Engineer Distributed Systems Fintech Infrastructure

****************@*****.*** +234 814-***-**** linkedin.com/in/joel-ajide-ademola github.com/vanjoe667 Lagos, Nigeria PROFESSIONAL SUMMARY

Fullstack engineer who builds payment systems that process millions — and sleeps soundly because they don't break. 7+ years architecting high-throughput fintech infrastructure. Built crypto on-ramps processing $2M+ monthly across 15 countries. Currently running payment systems handling 3-5k daily transactions with 99.9%+ uptime. Published open- source packages used across production services.

EXPERIENCE

Senior Backend Engineer (Lead Architect) Jul 2025 – Present Peniremit Remote • Crypto-powered bill payments & remittance platform Built entire payment backbone from scratch — processing thousands of transactions daily with near-zero incidents. Architected 7 core microservices (wallet, payments, notifications, scheduling, uploads) — 3-5k daily txns, <0.1% support tickets

Slashed inter-service latency 40% migrating REST gRPC with certificate-based auth Cut message failures 90% consolidating BullMQ + Redis Streams into production-grade RabbitMQ Reduced query latency 60% on ledger operations by migrating to TimescaleDB Published cross-language SDKs (NPM + PyPI) for proto definitions and gRPC certs — used across 5+ services Built Upload Service in Go handling 3k+ daily uploads with pre-signed S3 URLs — zero credential exposure Stack: Node.js, TypeScript, Fastify, FastAPI, gRPC, RabbitMQ, PostgreSQL, TimescaleDB, Go, AWS S3, Docker CTO & Co-Founder Jan 2021 – Jan 2025

Scalex Technologies Lagos • Global crypto on/off-ramp infrastructure Built crypto infrastructure company from zero to $2M+ monthly volume, serving partners across 15 countries. Established engineering foundation for on/off-ramp platform — partnered with EspressoCash, Gamic, Fonbnk, AlchemyPay

Designed modular payments backend handling remittances, settlements, compliance, and identity flows at scale Architected blockchain integrations (Solana, Ethereum, stablecoins) enabling low-fee cross-border transactions Created plug-and-play B2B2C SDK — reduced partner integration time from 4 weeks to 3 days Implemented gasless meta-transactions — reduced user onboarding drop-off by 35% Led team of 4 engineers — established standards for multi-service infrastructure Stack: Node.js, TypeScript, NestJS, MongoDB, Redis, RabbitMQ, Web3.js, Ethers.js, Solana, Solidity, Rust, AWS Senior Backend Engineer Oct 2024 – Jun 2025

Emple (Canalis Technologies) Remote (Contract) • Life & General Insurance Platform Built 6 core microservices — Underwriting, Claims, Quotation, Payments, Communication, Developer APIs Reduced payment integration time 85% (2 weeks 2 days) with provider-agnostic module (Paystack, 9jaPay) Achieved 99.5% message delivery rate using event-driven architecture with RabbitMQ Stack: Node.js, TypeScript, PostgreSQL, Knex, RabbitMQ, Sentry, Azure Software Engineer Mar 2024 – Oct 2024

CBIT Industries Remote (Contract) • E-Commerce & Logistics Control Tower Engineered Control Tower System — real-time order monitoring, SLA tracking, automated alerts — cut escalation response time 50%

Built Admin dashboard frontend with React + Vite — multi-tenant data sync across Customer, Merchant, and Admin portals

Developed promotions engine supporting percentage, flat, conditional, multi-tier rules — increased checkout conversion 15%

Stack: React, Vite, Node.js, TypeScript, Express, PostgreSQL, Prisma, Redis, RabbitMQ, AWS S3 PROJECTS & OPEN SOURCE

Seedwise — Smart Database Seeding Library npmjs.com/org/seedwise github.com/vanjoe667/seedwise Published @seedwise/core and @seedwise/knex — tracks which seeds have run (like migrations) so they don't re-execute. Solves duplicate seed data problem in development environments. TECHNICAL SKILLS

Languages TypeScript, JavaScript, Python, Go, Rust, Solidity Backend Node.js, Fastify, Express, NestJS, FastAPI Frontend React, Vite, Next.js, Tailwind CSS

Databases PostgreSQL, MongoDB, TimescaleDB, Redis, MySQL Messaging RabbitMQ, BullMQ, Redis Streams

Infrastructure AWS (EC2, S3, Lambda, RDS), Docker, Kubernetes, CI/CD Protocols gRPC, REST, WebSockets, Protocol Buffers Blockchain Ethereum, Solana, Web3.js, Ethers.js, Hardhat EDUCATION

Bachelor of Science, Computer Science — University of Ibadan 2019 WHAT SETS ME APART

Production mindset — I architect for failure modes, not just happy paths. Every system I build has monitoring, alerting, and graceful degradation baked in from day one.

Full-stack ownership — From database schema to deployment pipeline to frontend polish, I own the entire lifecycle. I've built companies from scratch; I treat every codebase like it's mine. Cross-functional fluency — I translate between product, design, and ops without a translator. Complex technical decisions become clear business outcomes that stakeholders understand.

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