Portfolio
Aljon Sealmoy Seidel
Senior Full Stack Developer
Senior Full Stack Developer with 13 years building scalable web applications
About
01Most of my recent work has been in food delivery and restaurant tech, where I've dug into the kinds of problems that surface at scale: slow queries, brittle API layers, deployment inconsistencies, and systems that need to stay reliable under pressure. I tend to get drawn into the parts of a codebase that are hardest to change, whether that's a migration to TypeScript, a caching strategy that needs rethinking, or an architecture decision that will matter two years from now. That early freelance and agency experience, working across different industries and codebases with different constraints, still shapes how I approach new problems today.
I'm a full stack developer with 13 years of experience building web applications across the entire stack, from consumer-facing React and Next.js interfaces to Node.js and NestJS back-end services. My work has spanned CMS platforms, e-commerce storefronts, enterprise tools, and high-traffic food tech products, and I've carried a consistent focus on performance and scalability throughout. I started my career doing freelance work alongside my studies, then spent years across agencies and product companies before moving into senior roles where I now shape architecture and engineering standards.
Skills
02- TypeScript
- JavaScript
- PHP
- HTML
- CSS
- Liquid
- React
- Next.js
- NestJS
- Node.js
- Vue.js
- AngularJS
- Express
- MySQL
- PostgreSQL
- Docker
- Git
- WordPress
- Shopify
- WooCommerce
- npm
Experience
03-
Mar 2023 → Jul 2026
Senior Full Stack Developer
CoverLayer Inc.- I built and maintained full stack features across a suite of web applications connecting restaurants and food delivery services with end users, working across React and Next.js on the front end and Node.js and NestJS on the back end.
- I led scalability improvements including API layer refactoring, caching strategy implementation, and database query optimization to keep the platform reliable under growing traffic.
- I drove the team's adoption of TypeScript and Docker as core standards, and took an active role in code reviews and shaping engineering best practices across the engineering organization.
- I architected back-end service enhancements that improved system reliability and throughput for a high-traffic consumer-facing food tech platform.
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Aug 2019 → Feb 2023
Full Stack Developer
Pinnacle Risk Solutions- I contributed to enterprise-level web platforms, building and maintaining both the React-based front end and the Node.js back-end services that powered the company's core products.
- I designed and maintained RESTful APIs, ensuring reliable integrations between front-end clients and back-end data layers across multiple product lines.
- I collaborated closely with the DevOps team to build and maintain Docker-based deployment pipelines, improving deployment consistency and reducing environment-related issues.
- I led the migration of significant portions of the codebase to TypeScript, improving long-term maintainability and reducing runtime errors across the platform.
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Jan 2017 → Jul 2019
Full Stack Developer
Meridian Digital Concepts- I took on broader technical ownership across client projects, delivering custom React applications, Node.js back-end services, and Shopify storefronts built with Liquid templates for e-commerce clients.
- I introduced TypeScript into front-end projects as the ecosystem matured, improving code quality and developer experience across the team.
- I built internal tools using early versions of Vue.js, demonstrating flexibility across front-end frameworks and a willingness to adopt emerging technologies.
- I drove key architectural and technology decisions on client engagements, balancing delivery timelines with code quality and long-term maintainability.
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May 2015 → Dec 2016
Junior Full Stack Developer
Archway Web Systems- I built and customized WordPress themes and plugins, including WooCommerce integrations, for small online retailers, gaining hands-on experience in CMS-driven full stack development.
- I developed bespoke web applications using PHP and MySQL, delivering custom back-end logic and database-driven features for client projects.
- I picked up AngularJS to deliver more interactive and dynamic front-end experiences, broadening my JavaScript skills beyond server-rendered pages.
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Jun 2013 → Apr 2015
Junior Software Developer
Meridian Digital Concepts- I built client websites and web applications using PHP, MySQL, jQuery, HTML, and CSS, developing a solid foundation in full stack web development from the ground up.
- I built and customized WordPress themes for small business clients, establishing strong CMS development skills and experience communicating technical solutions to non-technical stakeholders.
- I applied hands-on freelance experience from my studies to hit the ground running, contributing meaningfully to client projects from my first weeks on the job.