I am a Senior Full-Stack Developer with 10+ years of experience designing and delivering scalable web applications, SaaS platforms, and marketplace systems. I specialize in React, Next.js, Node.js, and NestJS, with solid database architecture experience in MySQL and PostgreSQL. I have hands-on experience with cloud deployment (AWS), payment integration (Stripe), performance optimization, and building production-ready systems used by thousands of users. I focus on clean architecture, reliability, and business-driven development.…

Severino Osena

I am a Senior Full-Stack Developer with 10+ years of experience designing and delivering scalable web applications, SaaS platforms, and marketplace systems. I specialize in React, Next.js, Node.js, and NestJS, with solid database architecture experience in MySQL and PostgreSQL. I have hands-on experience with cloud deployment (AWS), payment integration (Stripe), performance optimization, and building production-ready systems used by thousands of users. I focus on clean architecture, reliability, and business-driven development.…

Available to hire

I am a Senior Full-Stack Developer with 10+ years of experience designing and delivering scalable web applications, SaaS platforms, and marketplace systems.
I specialize in React, Next.js, Node.js, and NestJS, with solid database architecture experience in MySQL and PostgreSQL. I have hands-on experience with cloud deployment (AWS), payment integration (Stripe), performance optimization, and building production-ready systems used by thousands of users. I focus on clean architecture, reliability, and business-driven development.

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Skills

Experience Level

Node.js
Expert
React JS
Expert
MySQL
Expert
JavaScript
Expert
SQL
Expert
TypeScript
Expert
Express
Expert
UI
Expert
Amazon Web Services
Expert
Stripe
Expert
Tailwind
Expert
MongoDB
Expert
API
Expert
PostgreSQL
Expert
Docker
Expert
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Language

English
Advanced
Russian
Advanced

Work Experience

Senior Full-Stack Engineer at 8th Light
September 1, 2022 - December 1, 2025
Led architecture of production systems handling high concurrent traffic. Designed APIs with caching & DB tuning, reducing response times by 30%. Improved system observability, reducing production incidents by 25%. Mentored 4+ engineers, improving code quality and delivery speed.
Senior Full-Stack Developer at Designli
August 1, 2020 - October 1, 2021
Built SaaS platforms from concept to launch used by 5,000+ active users. Implemented Stripe billing, increasing recurring revenue stability. Reduced infrastructure costs by 20% via caching and query optimization. Contributed to AWS CI/CD pipelines improving deployment reliability.
Software Developer at Atomic Object
January 1, 2018 - May 1, 2020
Developed scalable applications supporting thousands of users. Optimized PostgreSQL queries, improving system performance by 28%. Participated in architecture planning and technical solution design.
Software Programmer at Simform
July 1, 2016 - November 1, 2017
Improved API performance by 25% through query and schema optimization. Refactored legacy modules, reducing bug rates and improving maintainability. Collaborated in Agile teams delivering features on time.
Full-Stack Developer (Freelance)
March 1, 2011 - June 1, 2016
Delivered 20+ custom web applications across SaaS and service sectors. Reduced page load times by up to 30% through frontend optimization. Managed end-to-end lifecycle including design, development, and deployment.

Education

Bachelor of Science in Information Technology (BSIT) at Polytechnic University of the Philippines
September 1, 2006 - June 7, 2010

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Professional Services
    paper Custom Business Website

    Designed and developed a professional business website for DM Craftsmen, a residential remodeling company.
    Built a responsive, modern, user-friendly site highlighting services, project galleries, client testimonials, and contact functionality.
    Developed clean layout and navigation to improve user experience and help convert visitors into estimate requests.
    Ensured the website looks great on mobile and desktop and structured content to support SEO visibility

    paper Engineering Web Products Built to Last

    Designed and developed a modern corporate website for Vanderbilt Insurance & Risk Management, emphasizing professional branding and user trust. Built fully responsive layouts for seamless navigation across insurance services and resources. Structured content to clearly present auto, home, and risk management solutions. Integrated quote request functionality and interactive elements to increase engagement and lead generation. Optimized performance, accessibility, and SEO to improve visibility and conversions.

    paper Building Reliable Web Solutions for Real Businesses

    Designed and developed a modern dealership website , focused on showcasing heavy machinery inventory, attachments, and service offerings.
    Implemented dynamic equipment listings with filtering by category, manufacturer, and condition.
    Built responsive layouts optimized for desktop and mobile users.
    Integrated search functionality, inventory management structure, and lead generation features to improve customer engagement and sales inquiries.
    Optimized performance, usability, and SEO structure for better search visibility and conversions.

    paper Building Structured, Results-Driven Web Products

    Designed and developed a modern exam preparation platform with mock test dashboards, performance analytics, free sample access, subscription system, and responsive UI. Focused on user experience for students and parents, optimized performance, and implemented structured content for SEO.

    paper Trusted End-to-End Delivery For Real Businesses

    Designed and developed a professional facilities management website focused on flexible FM solutions, interim staffing, and consultancy services. Built clear service pages, case studies, and job board functionality to support client engagement and recruitment. Optimized structure, performance, and user experience to reflect a trusted, people-first business approach.

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