Joel Ajide Ademola

Architected core payment infrastructure from scratch - 7 microservices handling wallet operations, payments, notifications, file uploads, and scheduling.

Achieved 3-5k daily transactions in week one with near-zero support tickets - built resilient systems with rich admin dashboards enabling self-service issue resolution Published Shared Peniremit Utils (NPM & PyPI) standardizing proto definitions and gRPC certificate management, enabling seamless Node.js/Python interoperability across 5+ services Reduced inter-service latency by ~40% by migrating REST → gRPC with certificate-based authentication Improved system reliability by consolidating fragmented async processing (BullMQ + Redis Streams) into production-grade RabbitMQ architecture - reduced message failures by 90% Cut time-series query latency by 60% on ledger operations by migrating Virtual Wallet Service to TimescaleDB Built high-performance Upload Service in Go with pre-signed S3 URLs - zero credential exposure, handles ~3k+ uploads/day across SMC DAO (parent company) services Tech: Node.js, TypeScript, Fastify, FastAPI, gRPC, Protocol Buffers, RabbitMQ, PostgreSQL, TimescaleDB, Go, AWS S3, Docker

Built engineering foundation for crypto on-ramp/off-ramp platform serving 4 global partners (EspressoCash, Gamic, Fonbnk, AlchemyPay) across 15+ countries Designed modular payments backend handling remittances, settlements, compliance checks, and identity flows - processed $2M+ monthly volume at peak Architected secure integrations with Solana, Ethereum, and stablecoin ecosystems enabling low-fee cross-border transactions Created plug-and-play B2B2C SDK reducing partner integration time from 4 weeks to 3 days Implemented gasless transactions (meta-transactions) for seamless user experience - reduced onboarding drop-off by 35% Mentored team of 4 engineers and established engineering standards across multi-service infrastructure Tech: Node.js, TypeScript, NestJS, MongoDB, Redis, RabbitMQ, Web3.js, Ethers.js, Solana, Solidity, Rust, AWS

Built core microservices backbone for insurance platform - Underwriting, Claims, Quotation, Payments, Communication, Developer APIs Reduced payment integration time from 2 weeks to 2 days by designing provider-agnostic module (Factory Pattern) supporting Paystack, 9jaPay without code rewrites Implemented event-driven architecture with clean service boundaries - 99.5% message delivery rate using RabbitMQ Tech: Node.js, TypeScript, PostgreSQL, Knex, RabbitMQ, Sentry, Azure

Engineered Control Tower System enabling real-time order monitoring, SLA tracking, and automated alerts - reduced logistics escalation response time by 50% Built multi-tenant platform with seamless data sync across Customer, Merchant, and Admin portals - 3 portals, 1 unified data layer Developed discount & promotions engine supporting percentage, flat, conditional, and multi-tier rules - increased checkout conversion by 15% Tech: Node.js, TypeScript, Express, PostgreSQL, Prisma, Redis, RabbitMQ, AWS S3