Open to opportunities

Collins Oromoni

@collinsoromoni

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Full‑stack software engineer specializing in scalable web and blockchain systems.

United Kingdom

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What I'm looking for

I seek a role building scalable web or blockchain products where I can improve performance, reliability, and deliverables through end‑to‑end engineering, testing, and documentation.

I am a full‑stack software engineer focused on building scalable web and blockchain applications, with hands‑on experience across frontend, backend, testing, and DevOps practices. I deliver performant user experiences using React/Next.js and optimize backend services with Node.js, GraphQL and MongoDB.

In recent roles I improved API latency from 1.31s to 98ms, cut time‑to‑market by 40%, and boosted stability and retention through load testing, comprehensive test suites, and UI performance work. I have built real‑time features with WebSockets, integrated payment gateways, and authored API docs and developer handover guides that reduced onboarding time by 50%.

I also contribute technical writing on React performance, web3 integrations, and system design, and I work with blockchain tools like Ethers.js and Hardhat to build smart contracts, dApps and NFT/DeFi features. I seek roles where I can drive end‑to‑end product quality and scalable architecture improvements.

Experience

Work history, roles, and key accomplishments

Fullstack Engineer

Chow

Feb 2025 - May 2025 (3 months)

Delivered React Native mobile front-end and Node.js/MongoDB backend, reducing rendering time 30% and cutting API response times 90%; integrated payment gateway APIs and authored API docs and integration tests to boost retention 20%.

React Native Node MongoDB API Integration Jest Payment Gateways CI CD

Software Engineer

Lux Rental

Mar 2024 - Sep 2024 (6 months)

Optimized Node.js/Express microservice endpoints, reducing latency from 1.31s to 98ms and improving scalability; led React UI and GSAP page optimizations that improved load times 40%, raised retention 15%, and cut bounce rate 25%.

Node React WebSockets MongoDB API Documentation Jest

Fullstack Engineer

YC Startup

Jan 2024 - Jul 2024 (6 months)

Directed end-to-end development of a scalable web platform, cutting time-to-market by 40% and improving stability 35% via Jest and DB testing; built Node.js/GraphQL/MongoDB microservices validated with Locust.io load tests.