Open to opportunities

John Oshalusi

@johnoshalusi1

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I've built scalable full-stack products across fintech, blockchain, SaaS, and AI workflows for nine years.

Nigeria

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What I'm looking for

I'm looking to build reliable, customer-facing products end-to-end, especially across fintech, SaaS, blockchain, or AI-powered workflows, while contributing to architecture and collaborating with distributed engineering teams.

At Input Output Group, I've spent four years building Lace Wallet, a production Cardano wallet used by thousands of active users across mobile and browser extensions. I own wallet experiences from onboarding, transactions, staking, multi-sig, and account management through React, TypeScript, Node.js, and GraphQL services.

I've also launched platforms from the ground up at Ontrac Technologies, improved high-traffic applications at SpiceFactory, and built reliable frontend systems for peak exam usage at Multilent Software. My work spans TypeScript, Go, Node.js, React, PostgreSQL, distributed systems, performance optimisation, and practical AI agent orchestration.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Input Output Group

May 2022 - May 2026 (4 years)

Core contributor to Lace Wallet, a production Cardano blockchain wallet. Owned end-to-end delivery of core wallet flows and led refactors that improved developer velocity.

React TypeScript GraphQL PostgreSQL Redis TypeORM Blockchain Cardano Unit Testing Integration Testing System Design

Software Engineer

SpiceFactory LLC

Aug 2021 - Mar 2022 (7 months)

Delivered full-stack improvements on a high-traffic application, refactored legacy components, and resolved performance bottlenecks.

GraphQL PostgreSQL Firebase React Performance Optimization

Software Engineer

Ontrac Technologies Limited

Feb 2020 - Aug 2021 (1 year 6 months)

Built and launched a platform from the ground up, owning the full stack from frontend to backend and deployment. Designed caching strategies and developed data models.

React Angular Python Django MySQL MongoDB Redis Electron Caching

Frontend Engineer

Multilent Software

Mar 2018 - Feb 2020 (1 year 11 months)

Built and optimized frontend systems with a focus on reliability during peak periods. Partnered with backend engineers to improve data loading performance.

Frontend Development Performance Optimization React