ReactNext.jsTypeScriptGraphQLNode.jsLangChainAnthropic Claude APIOpenAI APIMCP ServersAgentic Systems
Founder · Fullstack · 2024 → now
Senior Fullstack Engineer · Finland
JeshurunEzeobi.
I'm a fullstack engineer with deep expertise in frontend and agentic systems, building AI-native interfaces. At SingleFile, I shipped the CTA project behind a $9M funding round.
Education
— Jeshurun
130k+
Companies served at SingleFile
$9M
Funding round my CTA project contributed to
7+
Years shipping production software
Where I've worked
Seven years,
four teams, one habit — shipping.
- Full-timeApr 2022 — Present
Senior Software Developer
SingleFile Inc
Washington, USA
- ●Lead AI-feature work on an enterprise SaaS platform serving 130,000+ companies.
- ●Delivered the CTA project that contributed to the company securing a $9M funding round.
- ●Built 50+ reusable React/TypeScript components with Jest + Playwright coverage.
- + 2 more on the timeline
ReactTypeScriptDjangoJestPlaywrightGraphQL - Full-timeMay 2020 — Oct 2021
Founding Frontend Developer
Happierleads
London, United Kingdom
- ●Architected the frontend codebase and component patterns from zero — became the team standard.
- ●Designed a Storybook-driven library of 40+ React/TS components.
- ●Reached 88% coverage (Jest + Cypress); halved the bug-escape rate.
- + 2 more on the timeline
ReactTypeScriptJestCypressStorybookNode.js - ContractMar 2020 — May 2020
Frontend Developer (Contract)
GG Software Ltd
United Kingdom
- ●Built and maintained React/TS components for gameanalytics.com — 50M+ daily events.
- ●Reached 85% coverage with Jest + Cypress in a 3-month window.
- ●Resolved 40+ complex component issues; cut page load 25%.
ReactTypeScriptCypressJestREST APIs - InternshipMay 2013 — Nov 2013
Software Intern
Amitech Computers
Anambra, Nigeria
- ●Built responsive pages and e-commerce features with HTML, CSS, PHP, JavaScript.
- ●Shipped auth, form validation and payment integration modules.
- ●Optimised queries — −20% page load.
HTMLCSSPHPJavaScript
Personal projects
Built on my own time —
shipped, used, alive.
Four projects I built and maintain outside client work. Real users, real uptime, real code on GitHub.
Next.js 16React 19TypeScriptTailwind v4PostgreSQLServer Actions
Fullstack · Maintainer · 2025
ReactNext.jsTypeScriptNode.jsnext-intlTailwind CSSAnt DesignShadCN UIPlaywright
Fullstack · QA Lead · 2024
TypeScriptReactNext.jsNode.jsDjangoGraphQLLangChainMCPClaudeOpenAIPlaywrightCypressJestTailwindPostgreSQLAWSDockerTypeScriptReactNext.jsNode.jsDjangoGraphQLLangChainMCPClaudeOpenAIPlaywrightCypressJestTailwindPostgreSQLAWSDocker
Get in touch
Let's build something that ships.
One project at a time, replies within 48 hours, and a real human on the other end. Send a note — anything agentic, AI-native or genuinely hard, I'd like to hear about it.