Name: Sameera Madushan
Role: Technical Lead & Senior Full-stack Engineer
Location: Boralesgamuwa, Sri Lanka
Email: sameeradelpechithra@gmail.com
LinkedIn: https://linkedin.com/in/sameeradelpechithra
GitHub: https://github.com/sameeramadushan

Professional Summary:
Technical Lead and Full-stack Engineer with 9+ years building scalable web and mobile platforms across automotive, healthcare, and telecom. Currently leading frontend engineering for a Dutch B2B vehicle-repair marketplace.

Key Achievements:
- Led a cross-functional team of 6+ (devs, QA, DevOps, POs) to a 95% on-time delivery rate.
- Delivered a zero-incident Webpack to Turbopack migration (Next.js 16 / React 19) in under 2 sprints: full build ~5 min to 44s (~85% reduction), dev-server startup 14s to 6s, page compile 782ms to 102ms, memory steady at ~4GB versus prior 8GB spikes.
- Traced ~90% of production errors in Sentry to a single 401 error storm; executed a 4-phase remediation plan cutting Sentry error volume by 50%+.
- Restructured a ~100-issue modernization epic into 5 focused epics and a 16-phase React 19 migration program.
- Introduced trunk-based development and LaunchDarkly feature flagging across 4 repos, cutting cycle time by 30%.
- Championed AI-assisted engineering: led a Claude Code pilot with a documented 93.8% efficiency gain.
- Authored the Frontend Unit Testing Playbook (Jest + React Testing Library, 70%+ coverage target).

Experience:
- Technical Lead — Gapstars | Fixico · Sri Lanka (Sep 2024 - Present)
    Leading frontend engineering for the marketplace's product dashboards across four production repositories.
    * Directed a team of 6+ (devs, QA, DevOps, POs) with a 95% on-time delivery rate.
    * Delivered zero-incident Webpack to Turbopack migration slashing build times by ~85% (5 min to 44s).
    * Cut production Sentry error rate by 50%+ after solving a critical 401 error storm.
    * Pioneered Claude Code AI pilot achieving a documented 93.8% efficiency gain.
- Senior Software Engineer — Gapstars | Fixico · Sri Lanka (Sep 2021 - Sep 2024)
    Owned platform stability and delivered complex features including cross-platform user management, Next.js migrations, and team mentoring.
- Lead Mobile Engineer — ObjectOne | NCell Nepal (Nov 2020 - Sep 2021)
    Designed mobile platform architecture with Keycloak auth; shipped React Native distribution app on App Store, Play Store, and CodePush.
- Software Engineer — Villvay · Sri Lanka (Nov 2018 - Nov 2020)
    Built dealer management tools (React, Webpack) and customer platforms (MeteorJS, Spring Boot REST API, React Native).
- Junior Software Engineer — Virtusa · Sri Lanka (Nov 2016 - Nov 2018)
    Automated manual banking workflows (reducing time by 2X) and created real-time Node.js dashboards.

Selected Projects:
- Build Tooling Modernization: Led a zero-incident Webpack-to-Turbopack migration on a production Next.js dashboard (Next.js 16 / React 19), cutting build times by ~85%. (Next.js, React, Turbopack, TypeScript)
- AI-Assisted Development: Ran a Claude Code pilot measuring a 93.8% effort reduction on test writing, then designed a shared fifteen-repo workspace that cut cross-service debugging from ~3 hours to ~30 minutes. (Claude Code, Developer Experience, Jest & RTL, Documentation)
- Platform Stability & Monitoring: Audited Sentry across two production Next.js dashboards: 13.5M transactions against ~25k errors, 75–90% of them noise. Defined the sampling, capture and user-context policy to bound both. (Sentry, Observability, Next.js, Cost Control)
- Continuous Delivery & Feature Flags: Moved four repositories to trunk-based development behind LaunchDarkly flags, decoupling deploy from release and cutting cycle time by ~30%. (Trunk-Based Dev, LaunchDarkly, CI/CD, A/B Testing)

Skills:
- Frontend: React 18/19, Next.js, TypeScript, Turbopack, Redux Toolkit, Material UI
- Backend & APIs: Node.js, Next.js API, REST, GraphQL, MySQL, Cloud SQL
- Cloud & DevOps: Docker, Kubernetes, GCP, LaunchDarkly, Sentry, CircleCI
- AI & Practices: Claude Code, Gemini, Cursor, Trunk-Based Dev, Jest & RTL