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Olusegun Olayinka

About

Engineer. Designer. Quiet operator.

I've spent the last seven years shipping financial platforms (9jaPay), insurance platforms (Unyte Africa), AI tooling (Turing), and a few independent e-commerce builds. The work I'm proud of has a few things in common: a typed contract end-to-end, a small design system that holds up under change, performance that doesn't degrade as the codebase grows, and accessibility wired in from the first commit. Outside product teams, I partner with founders, photographers, designers, and consultants on bespoke portfolio sites that read like print and ship like static.

Portrait of Olusegun Olayinka

Values

The things I won't compromise on.

  • /01

    Craft is a default

    Type, spacing, motion, and contrast are not afterthoughts — they are the product. I sweat the kerning so your users feel cared for.

  • /02

    Performance as a feature

    Every site I ship targets Lighthouse 95+ across the board. Fast loads convert better, rank better, and respect your users.

  • /03

    Accessible by construction

    WCAG AA is the floor, not the ceiling. Semantic HTML, focus states, contrast, and reduced-motion are baked into every component.

  • /04

    Own your platform

    You should be able to leave me. Code lives in your repo, copy in MDX, design in your Figma. No proprietary platform, no lock-in.

Experience

A short résumé.

  1. Turing

    Nov 2024 — Present

    California, United States (Remote)

    Senior Software Engineer

    • Architected React-based internal platforms for evaluating AI-powered systems on large datasets.
    • Designed modular, scalable frontend architecture in TypeScript that reduced cross-feature regressions.
    • Established testing and validation flows that improved production output reliability.
  2. 9jaPay

    Apr 2023 — Nov 2024

    Lagos, Nigeria

    Senior Frontend Engineer

    • Led the frontend architecture and delivery of the business banking platform end-to-end.
    • Designed component systems and state management for KYC/KYB and transaction flows.
    • Integrated Sentry and a structured error-handling layer that cut incident resolution time.
  3. Unyte Africa

    Mar 2022 — Apr 2023

    Lagos, Nigeria

    Mid-level Software Engineer

    • Reduced production defects by 60% with unit, integration, and end-to-end testing.
    • Built dashboards for policy operators that improved usability and engagement.
    • Contributed to the launch of a digital insurance platform serving thousands.
  4. Auditbar Ltd.

    Dec 2020 — Mar 2022

    Lagos, Nigeria

    Frontend Engineer

    • Optimized site performance, reducing page load times by 30%.
    • Implemented React Query for data fetching, cutting unnecessary network requests.
    • Hardened site security with vulnerability scanning and activity tracking.
  5. TellerOne

    Jan 2020 — Nov 2020

    Lagos, Nigeria

    Associate Software Engineer

    • Rebuilt a legacy jQuery frontend in React, refactoring 70%+ of the legacy code.
    • Improved the integration layer between frontend and backend services.

Let's talk

Have a project in mind?

Hiring a senior frontend lead, or commissioning a portfolio site that finally reads the way you write? Four questions, one tailored quote, no generic price list.

Olusegun Olayinka — portrait
Olusegun OlayinkaLagos, Nigeria