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Oseni Adefemi

@oseniadefemi

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Senior software engineer specializing in backend systems, performance, and scalable integrations.

Nigeria

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What I'm looking for

I seek technical roles where I can improve system performance, scalability, and developer productivity, mentor engineers, and drive reliable production delivery.

I am a senior software engineer with extensive experience building backend and frontend systems that prioritize performance, reliability, and developer productivity. I have improved stability, security, and data integration across multiple platforms while leading projects from design to deployment.

My work spans micro-frontends, GraphQL Federation, cache optimization, real-time socket services, and CI/CD implementations, with a focus on streamlining developer workflows and onboarding through clear documentation and reusable components.

I mentor junior engineers, drive code quality via reviews and testing practices, and deliver measurable improvements in application efficiency, resilience, and user engagement.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Bleacher Report

Jun 2021 - Present (4 years 3 months)

Improved software stability and security, advanced data integration and GraphQL Federation, and implemented an efficient cache service to reduce data retrieval times and boost application performance.

Python GraphQL Caching System Security Data Integration API Design Performance Optimization Testing

Backend Software Engineer

Retina-AI Health

Jan 2022 - Mar 2023 (1 year 2 months)

Built a real-time socket service, implemented fail-safe email mechanisms, introduced asynchronous processing for concurrent requests, and produced developer documentation to speed onboarding.

Real Time Systems WebSockets Asynchronous Programming Documentation Testing Python API Development

Frontend Software Engineer

Pangaea Holdings

Apr 2021 - Dec 2021 (8 months)

Developed interactive frontend features, led code reviews and A/B tests to refine UX, and implemented SEO strategies to increase visibility and user engagement.

React A B Testing SEO Frontend Development Code Review JavaScript Analytics

Senior Frontend Engineer

Kodobe Ltd

Jan 2021 - May 2021 (4 months)

Adopted micro-frontend architecture and unified design systems to accelerate development, streamlined pipelines for faster deployments, and created reusable Node.js packages to improve efficiency.

Design Systems Node CI CD Frontend Architecture React Automation)

Senior Software Engineer

Algorism Ltd

Jan 2019 - Dec 2020 (1 year 11 months)

Led projects to successful deployment, implemented CI/CD to speed delivery, improved code quality via collaborative practices, and mentored junior developers to raise team capability.