Open to opportunities

Diego Martinez

@diegomartinez1

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Senior Full Stack Developer specializing in scalable, secure web applications using JavaScript, TypeScript, and Python.

Croatia

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What I'm looking for

I seek senior/full‑stack roles where I can lead architecture and teams, build secure high‑performance web apps, and drive product lifecycle from design to deployment.

I am a Senior Full Stack Developer with 10+ years building scalable, end-to-end web applications across healthcare, finance, and SaaS. I design responsive frontends and robust backends, and I focus on performance, security, and user-centric solutions.

At Gearheart I led development of a HIPAA-compliant healthcare document platform serving 50K daily users, implemented JWT/OAuth2 access control, built real-time features with Socket.io, and created Python FastAPI microservices for document processing. I reduced load times, mentored an 8-person team, and migrated legacy systems to modern stacks.

I have delivered high-performance tracking systems, multi-tenant SaaS platforms, real-time analytics, and optimized database and backend architectures to improve latency and throughput. I adopt CI/CD, cloud-native deployment patterns, and practical security practices to reliably take products from concept to production.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Gearheart

Mar 2023 - Present (2 years 10 months)

Designed and led development of a HIPAA-compliant healthcare document management platform serving 50K daily active users; migrated legacy jQuery to React reducing load times by 60% and implemented JWT/OAuth2 for enterprise access control.

React TypeScript RESTful APIs GraphQL fastAPI Socket.IO Redux OAUTH2 HIPAA

Lead Developer

Softnix

Jun 2020 - Dec 2025 (5 years 6 months)

Developed a multi-tenant SaaS platform using React and Node.js microservices, implemented CI/CD and AWS deployments, and optimized backend caching and clustering to reduce API latency by 45% while achieving 95+ Lighthouse scores.

React Node Microservices AWS CI CD Redis Fastify D3.Js Performance Optimization

Full Stack Developer

Dawson Andrews

Apr 2017 - Dec 2025 (8 years 8 months)

Built a high-performance tracking system processing 100M+ events daily with sub-second responses, implemented fraud detection reducing invalid traffic by 30%, and deployed JS widgets to 10,000+ partner sites for real-time conversion tracking.

JavaScript MongoDB PostgreSQL WebSockets REST APIs Fraud Detection Performance Tuning Data Pipelines

Full Stack Developer

Bornfight

May 2014 - Dec 2025 (11 years 7 months)

Developed cross-browser responsive web applications for healthcare, finance, and manufacturing using modern and legacy JavaScript stacks, designed versioned RESTful APIs, and optimized databases to improve performance by 50%.