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I'm Funsho Cornelius Olusumbo, a frontend engineer based in Lagos with five years of experience building web applications in React, Next.js and TypeScript. I like the parts of frontend work that don't show up in a screenshot. On a marketplace app, I built the real-time messaging layer where inbound socket events and optimistic user actions reconcile into a single cache, so every screen stays consistent without refetching, and hardened its data flows for the network conditions our users actually had. On an internal admin platform, I designed the authentication and session architecture around its failure modes, including a token refresh route that deliberately never retries because a retry could revoke the whole session. I've also built a live classroom Q&A system solo, where four separate screens run off one reactive data source and the fairness rules live in the backend rather than the client. I care about architecture that holds up as a team grows, measurable performance, and accessible interfaces. I currently teach React part-time, and I'm looking for frontend roles where I can keep building products that ship and keep working.…I'm Funsho Cornelius Olusumbo, a frontend engineer based in Lagos with five years of experience building web applications in React, Next.js and TypeScript. I like the parts of frontend work that don't show up in a screenshot. On a marketplace app, I built the real-time messaging layer where inbound socket events and optimistic user actions reconcile into a single cache, so every screen stays consistent without refetching, and hardened its data flows for the network conditions our users actually had. On an internal admin platform, I designed the authentication and session architecture around its failure modes, including a token refresh route that deliberately never retries because a retry could revoke the whole session. I've also built a live classroom Q&A system solo, where four separate screens run off one reactive data source and the fairness rules live in the backend rather than the client. I care about architecture that holds up as a team grows, measurable performance, and accessible interfaces. I currently teach React part-time, and I'm looking for frontend roles where I can keep building products that ship and keep working.

FUNSHO CORNELIUS OLUSUMBO

Front-End Developer, Programmer, Drummer, +4

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I'm Funsho Cornelius Olusumbo, a frontend engineer based in Lagos with five years of experience building web applications in React, Next.js and TypeScript. I like the parts of frontend work that don't show up in a screenshot. On a marketplace app, I built the real-time messaging layer where inbound socket events and optimistic user actions reconcile into a single cache, so every screen stays consistent without refetching, and hardened its data flows for the network conditions our users actually had. On an internal admin platform, I designed the authentication and session architecture around its failure modes, including a token refresh route that deliberately never retries because a retry could revoke the whole session. I've also built a live classroom Q&A system solo, where four separate screens run off one reactive data source and the fairness rules live in the backend rather than the client. I care about architecture that holds up as a team grows, measurable performance, and accessible interfaces. I currently teach React part-time, and I'm looking for frontend roles where I can keep building products that ship and keep working.…I'm Funsho Cornelius Olusumbo, a frontend engineer based in Lagos with five years of experience building web applications in React, Next.js and TypeScript. I like the parts of frontend work that don't show up in a screenshot. On a marketplace app, I built the real-time messaging layer where inbound socket events and optimistic user actions reconcile into a single cache, so every screen stays consistent without refetching, and hardened its data flows for the network conditions our users actually had. On an internal admin platform, I designed the authentication and session architecture around its failure modes, including a token refresh route that deliberately never retries because a retry could revoke the whole session. I've also built a live classroom Q&A system solo, where four separate screens run off one reactive data source and the fairness rules live in the backend rather than the client. I care about architecture that holds up as a team grows, measurable performance, and accessible interfaces. I currently teach React part-time, and I'm looking for frontend roles where I can keep building products that ship and keep working.

Available to hire

I’m Funsho Cornelius Olusumbo, a frontend engineer based in Lagos with five years of experience building web applications in React, Next.js and TypeScript.

I like the parts of frontend work that don’t show up in a screenshot. On a marketplace app, I built the real-time messaging layer where inbound socket events and optimistic user actions reconcile into a single cache, so every screen stays consistent without refetching, and hardened its data flows for the network conditions our users actually had. On an internal admin platform, I designed the authentication and session architecture around its failure modes, including a token refresh route that deliberately never retries because a retry could revoke the whole session. I’ve also built a live classroom Q&A system solo, where four separate screens run off one reactive data source and the fairness rules live in the backend rather than the client.

I care about architecture that holds up as a team grows, measurable performance, and accessible interfaces. I currently teach React part-time, and I’m looking for frontend roles where I can keep building products that ship and keep working.

Skills

Experience Level

Expert

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Intermediate

Intermediate

Intermediate

Language

English

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Yoruba

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Work Experience

Web & Systems Engineer at Technocrat Technologies / Blessing Computers

February 1, 2026 - Present

Enforced architecture governance in CI using eslint-plugin-boundaries and authored ADRs plus a feature scaffolding generator. Built a typed data layer that unwraps API envelopes and normalizes inconsistent response shapes into typed errors. Designed server-seeded sessions and token refresh behavior (no-retry refresh route, cross-tab single-flight refresh via Web Locks). Hardened edge security including env isolation, Vercel WAF/IP-block recovery, and SSR cookie-forwarding fixes. Shipped a serverless upload proxy (bypassing edge timeouts) and an AI smart-paste parser behind a unit-testable LLM seam. Also built a custom Next.js server and integrated checkout across two payment gateways (Miden, Paystack) while managing Nginx/PM2/SSL/DNS infrastructure.

Frontend Engineer at Pikkam (Peer-to-Peer Marketplace)

August 1, 2025 - April 1, 2026

Built real-time messaging with optimistic UI and socket-driven RTK Query cache reconciliation using temp-ID rollback and event de-duplication so live and self-sent messages converge without refetching. Created a modular tag-driven data layer with an invalidation graph for surgical cache updates across domains (messages, offers, listings, notifications). Shipped an AI-assisted listing flow that pre-fills forms with guardrails for low-confidence results and review-before-publish framing. Hardened data flows for lossy networks using upload timeouts, AbortController, and backoff retries with plain-language recovery messaging. Implemented dual-cookie session auth (httpOnly + client-readable mirror) with middleware route gating and a singleton socket service for reconnection/network recovery.

Frontend Development Instructor (Part-time) at Pedagon Academy

January 1, 2025 - Present

Delivered project-based training in HTML, CSS, JavaScript, Tailwind CSS, and React; designed an 8-week ReactJS curriculum and mentored learners through live coding, code reviews, and debugging support.

Frontend Engineer at BulqSoft

May 1, 2023 - May 1, 2024

Refactored components into a reusable TypeScript design system reducing code duplication by 40%. Improved frontend performance by 65% and reduced load time by 3.2s using Lighthouse/Core Web Vitals audits; optimized caching with React Query for additional ~40% load-time reduction. Integrated Stripe payments for real-time transaction flows and implemented CI/CD pipelines to reduce production bugs by 30%.

Frontend Engineer at Universal Site Technologies

August 1, 2021 - May 1, 2023

Designed and shipped React/Next.js components for Splunk-integrated security analytics dashboards including alert/trend visualizations with Chart.js and Recharts. Integrated REST and GraphQL APIs with over 98% test coverage. Built RBAC workflows and reusable component libraries reducing dev cycle time by 45%.