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Severino User

@severinouser

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Senior full-stack developer building scalable SaaS and AI systems with high-performance APIs.

Philippines

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What I'm looking for

I’m looking for a team that values clean architecture and scalable systems, where I can build high-performance APIs, ship AI-powered automation, and improve reliability and cost with data-driven optimization.

I’m a Senior Full-Stack Developer with 10+ years of experience building scalable web applications, SaaS platforms, and AI-powered systems. My focus is clean architecture, scalability, and measurable business impact through production-ready engineering.

Over the last several years, I’ve architected backend systems using Node.js and Python (FastAPI), designed and optimized APIs, and worked on microservices and cloud-based architectures. In one role, I reduced response times by 30% and improved system observability, cutting production incidents by 25%.

I integrate AI-powered capabilities that actually ship—using OpenAI APIs for automation and intelligent workflows, along with prompt engineering to improve outcomes. I’ve also delivered SaaS experiences for thousands of users, including building platforms end-to-end with React and Node.js and supporting growth to 5,000+ users.

I’m equally comfortable building the full product lifecycle: from delivery in agile environments to performance optimization (like improving PostgreSQL query performance by 28%) and refactoring legacy systems for maintainability. I mentor engineers to improve team delivery efficiency and consistently aim for reliable, high-performance software.

Experience

Work history, roles, and key accomplishments

Senior Full-Stack Engineer

8th Light

Sep 2022 - Dec 2025 (3 years 3 months)

Architected scalable backend systems with Node.js and Python (FastAPI) to handle high concurrent traffic.
Designed and optimized APIs, reducing response times by 30%, and integrated OpenAI APIs for automation and intelligent workflows.

fastAPI Docker Next.js React Python Django GraphQL Redis PostgreSQL AWS CI CD

Senior Full-Stack Developer

Designli

Aug 2020 - Oct 2021 (1 year 2 months)

Built SaaS platforms end-to-end with React and Node.js, serving 5,000+ users. Integrated Stripe payments, implemented AI-assisted features, and reduced infrastructure costs by 20% through optimization.

ReactJS Javascript (ES6)NodeJS ExpressJS OpenAI Docker Cloud Services AWS PostgreSQL CI CD REST APIs

Software Developer

Atomic Object

Jan 2018 - May 2020 (2 years 4 months)

Developed scalable applications and backend services, contributing to architecture and system design decisions. Optimized PostgreSQL queries, improving performance by 28%.

PostgreSQL Docker React TypeScript NodeJS NestJS ExpressJS Python fastAPI AWS

Software Programmer

Simform

Jul 2016 - Nov 2017 (1 year 4 months)

Improved API performance by 25% through targeted optimizations and refactoring of legacy systems. Delivered features in agile environments while improving maintainability.

Git HTML5 CSS3 JavaScript jQuery Bootstrap PHP Laravel MySQL WordPress

Freelance Full-Stack Developer

Freelance

Mar 2011 - Jun 2016 (5 years 3 months)

Delivered 20+ web applications across SaaS and service sectors, managing the full development lifecycle. Built responsive frontends and scalable backend systems for end-to-end solutions.

Responsive UI REST APIs SaaS PostgreSQL MySQL MongoDB

Education

Degrees, certifications, and relevant coursework

Polytechnic University of the Philippines

Bachelor of Science in Information Technology (BSIT), Information Technology

2006 - 2010

Grade: 3.7

Activities and societies: Built web-based projects using React and Node.js, collaborated on team assignments, participated in coding and software development activities

Earned a Bachelor of Science in Information Technology (BSIT) at the Polytechnic University of the Philippines.