Open to opportunities

Sebastian Perez

@sebastianperez1

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Senior Full-Stack & AI engineer building scalable web apps and production-ready AI for impact.

Colombia

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What I'm looking for

I’m looking for a role where I can build scalable full-stack products and production-grade AI—pairing React/Next.js development with LLM evaluation, RLHF/prompt engineering, and MLOps. I want to mentor teams and ship measurable impact.

I’m a Senior Full-Stack & AI Engineer with 7+ years designing and developing scalable web applications, AI-powered solutions, and enterprise platforms across fintech, banking, and payment industries. I bring 5+ years of hands-on AI experience—training, fine-tuning, LLM integration, AI agent systems, and intelligent automation—to deliver production-ready outcomes.

Most recently, I led AI-powered analytics used by 500,000+ users, improving engagement by 28% and increasing feature adoption by 35%. I’ve also built scalable, accessible React/Next.js platforms and integrated AI-driven predictive analytics and automated messaging—then backed it all with strong evaluation, RLHF workflows (including preference/response ranking), prompt engineering, and MLOps practices to ensure quality, reliability, and safe AI behavior.

Experience

Work history, roles, and key accomplishments

Senior FullStack Engineer

Bitly

Jan 2025 - May 2026 (1 year 4 months)

Led development of AI-powered analytics used by 500,000+ users, increasing engagement 28% and feature adoption 35%. Architected scalable React/Next.js frontend and AI/ML pipelines for link-usage recommendations, while improving performance, accessibility, and system reliability.

React Next.js Recommendation Systems Accessibility Analytics Engineering

Senior Full Stack Developer

Accurx

Mar 2023 - Dec 2024 (1 year 9 months)

Designed and built the Accurx platform for patient-clinician communication, improving NHS workflow efficiency and patient outcomes. Led responsive, scalable React/Next.js frontend and delivered AI-driven predictive analytics, automated messaging, and intelligent notifications; mentored teams and improved performance, reliability, accessibility, and security.

React Next.js Predictive Analytics Frontend Architecture Accessibility

Full Stack Developer

Spyrosoft

Oct 2020 - Feb 2023 (2 years 4 months)

Developed and maintained frontend and backend applications across healthcare, finance, education, and automotive, building responsive UIs with React and TypeScript. Implemented REST APIs and backend services with Node.js/Express and GraphQL, and supported Agile delivery, code standards, and CI/CD pipelines.