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Daniel Baran

@danielbaran

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Senior Software Engineer specializing in scalable full‑stack web applications and performance optimization.

Poland

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What I'm looking for

I seek senior full‑stack roles focused on scalable web platforms, strong engineering culture, mentorship opportunities, and measurable impact via performance and reliability improvements.

I am a Senior Software Engineer with over 9 years delivering scalable, high-performance full‑stack applications across SaaS, IoT, media, and healthtech domains. I build robust frontends with React, Next.js, Angular, and Vue, and design secure backends with Node.js/Nest.js and PHP/Laravel.

I have a proven track record migrating monoliths to microservices, optimizing performance with code splitting, memoization, and virtualized rendering, and implementing RESTful and GraphQL APIs with CI/CD automation. I consistently improve system reliability through Docker, AWS, Redis, and test automation.

I thrive in agile, cross-functional teams, mentoring junior engineers and contributing to end-to-end delivery that enhances client platforms in fintech, healthcare, and media.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

SPD Technology

Apr 2021 - Present (4 years 6 months)

Engineered scalable enterprise web applications and APIs for fintech and healthcare, migrated PHP monoliths to microservices, and optimized React frontends to reduce bundle size and improve dashboard performance.

React Next.js PHP (Laravel)Docker GraphQL Redis React Lazy React Window CI CD

Full Stack Engineer

Pethelp

Jul 2019 - Apr 2021 (1 year 9 months)

Built interactive music discovery and streaming features, designed scalable Node.js backends serving millions of streams, and implemented ElasticSearch-powered search and Stripe payment flows.

React Angular Node MongoDB Elasticsearch Stripe JWT Docker AWS EC2 Redis

Full Stack Developer

Zabka Polska

Nov 2015 - Jun 2019 (3 years 7 months)

Developed real-time air quality IoT dashboards and backend services, implemented WebSocket/MQTT alerting, and optimized ingestion pipelines to handle high-frequency sensor data.