Tosin Felixson Yusuf
Lagos
Summary
Lead React Developer with 13+ years of professional software engineering experience, including 10+ years focused on frontend architecture using React, TypeScript, and Next.js. Proven track record modernizing legacy platforms into reusable, scalable frontend systems, including a unified React/TypeScript portal serving 2,000+ firms and 200k+ end users. Experienced in building UI components and patterns, Developer Portal / API discovery experiences, and API-driven integration workflows. Strong delivery in Agile environments with automation (build, deploy, configure, validate, monitor) in regulated contexts (SOC 2, ISO 27001, HIPAA-aligned systems).
Overview
14
14
years of professional experience
Work History
Head of Engineering (Hands-on Frontend/Platform Lead)
Helium Health
01.2024 - Current
- Led modernization of a large enterprise EMR platform, guiding architecture and delivery from Elixir/Angular to Vue, React/Next.js, and Node.js using event-driven architecture (Kafka).
- Owned technical delivery and release execution across a 30+ engineer organization, while remaining hands-on on critical frontend and platform systems.
- Defined and delivered 9 core solutions spanning EMR workflows, integrations, and AI-enabled consultation experiences.
- Led the AI transition, acting as solution architect and lead frontend engineer (React/Next.js) for clinical decision support and medical scribe workflows; fine-tuned and trained models on proprietary healthcare data.
- Integrated AI-powered consultation workflows with HMO/billing, Paystack payments, and core clinical services used across 500+ facilities.
- Contributed to ISO 27001 certification and HIPAA-aligned workflow hardening; partnered with platform and operations teams on CI/CD automation, monitoring, and production readiness.
- Africa & GCC
Senior Software Engineer (Permanent)
Botkeeper
01.2021 - 08.2025
- Modernized multiple legacy portals into a unified React/TypeScript platform serving 2,000+ accounting firms and 200k+ end users.
- Built and maintained UI components and patterns (design system + reusable component library), delivering polished, consistent, responsive and accessible UI adopted across teams.
- Standardized frontend architecture for large migrations using Redux and modularized complex flows with Hooks/Context.
- Shipped enterprise-grade npm libraries using Webpack, packaging reusable UI and workflow modules embedded across legacy systems and third-party applications.
- Built and maintained Node.js services powering an API Platform for integrations including QuickBooks workflows and bank connectivity (e.g., Bank of America).
- Supported partner/customer integration troubleshooting under third-party constraints; strengthened testing discipline (Jest), frequent production releases, and mentored engineers as a technical escalation point.
Senior Software Engineer (Part-time Consulting)
Tontine AI
02.2021 - 08.2024
- Delivered v1 capabilities for a real-time commerce/AI product, shaping frontend architecture, integrations, and reliability.
Senior Software Engineer (Contract, Relocation)
Bolt
09.2022 - 04.2023
- Frontend delivery on a large-scale mobility platform, focusing on performance-critical user flows and end-to-end testing in a high-traffic consumer environment.
Senior Technical Consultant (Andela Talent Network)
Andela
01.2019 - 01.2021
- Deployed to the Botkeeper engagement; mentored engineers through onboarding, code reviews, pairing, and delivery standards.
Software Engineer (GIS & Health Systems)
eHealth Africa
10.2017 - 01.2019
- Built a configurable vaccination tracking system for large-scale public health programs using React/React Native, Node.js, Python, and GIS tooling.
- Implemented CI/CD, Docker, and Kubernetes for reliable deployments in field environments.
Software Engineer
Algorism • ISEM/Support Systems • e-Sense Technologies
01.2012 - 01.2017
- Delivered web and geospatial platforms across frontend and backend systems, progressing from IC delivery to technical leadership.
Education
M.Sc. - Computer Science
Georgia Institute of Technology
USA12-2026
B.Sc. - Geography
Ahmadu Bello University
Nigeria01.2011
Skills
- React
- Database management
- Frontend frameworks
- TypeScript
- ES6
- Nextjs
- Redux
- Hooks/Context
- Vue
- SPA architecture
- Performance optimization
- Tailwind CSS
- MUI
- Bootstrap
- Styled Components
- CSS Modules
- Raw CSS
- Responsive & accessible UI (WCAG-aligned)
- Npm (package authoring/versioning)
- Webpack
- Design systems
- Reusable component patterns
- Jest
- React Testing Library
- End-to-end testing
- Nodejs
- Python
- REST APIs
- Third-party integrations
- Modular frontend architecture
- Event-driven systems
- Kafka
- AWS (S3, Cognito)
- Terraform
- CI/CD
- Docker
- Kubernetes
- Basic observability
- SOC 2
- ISO 27001
- HIPAA-aligned systems
Open Source Shared Libraries
- Unified-redux-wrapper, public npm package, https://www.npmjs.com/package/unified-redux-wrapper
- Built and maintained multiple internal npm libraries to standardize state management, UI patterns, and integration workflows across teams.
Personal Information
- Relocation: Open to relocation
- Title: Lead Frontend Engineer (React, TypeScript, Next.js)
Languages
English
Native
Native
Timeline
Head of Engineering (Hands-on Frontend/Platform Lead)
Helium Health
01.2024 - Current
Senior Software Engineer (Contract, Relocation)
Bolt
09.2022 - 04.2023
Senior Software Engineer (Part-time Consulting)
Tontine AI
02.2021 - 08.2024
Senior Software Engineer (Permanent)
Botkeeper
01.2021 - 08.2025
Senior Technical Consultant (Andela Talent Network)
Andela
01.2019 - 01.2021
Software Engineer (GIS & Health Systems)
eHealth Africa
10.2017 - 01.2019
Software Engineer
Algorism • ISEM/Support Systems • e-Sense Technologies
01.2012 - 01.2017
M.Sc. - Computer Science
Georgia Institute of Technology
B.Sc. - Geography
Ahmadu Bello University