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Elijah Stephenson

@elijahstephenson1

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Full Stack Software Engineer with 10+ years building scalable web/mobile apps with Node.js, React, TypeScript.

Romania

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What I'm looking for

I’m looking to build high-performance, scalable web and mobile products in Agile teams—owning end-to-end design, APIs, and performance optimization. I want challenging engineering work with cross-functional collaboration and room to iterate fast.

I’m a Full Stack Software Engineer with 10+ years of experience building scalable web and mobile applications using Node.js, React, TypeScript, Python, PostgreSQL, and REST APIs. I design end-to-end solutions, integrate third-party services, and optimize application performance while collaborating with cross-functional teams to deliver reliable, user-focused products.

In my work as a Senior Full-Stack Engineer (Self Employed | 2022 - 2025), I built and developed scalable full-stack applications using Node.js, Fastify, and Agile/Scrum. I built and integrated RESTful APIs, optimized application performance, and improved user experience for over 100,000 monthly users, including third-party service integration and PDF export functionality for scheduling tools.

Before that, I served as a Senior Full-Stack Developer at Societe Generale (2021 - 2022), where I worked on a social network (mobile/web) app using React and React Native. I led back-end development (Sails.js, DynamoDB) and supported front-end work (React, React Native), building an MVP for the mobile/web product.

I’m also proud of my ability to quickly learn new technologies and deliver high-quality software in fast-paced Agile environments. Whether it’s architecting component libraries, implementing A/B testing infrastructure, or improving Core Web Vitals, I stay focused on performance and solving complex engineering challenges.

Experience

Work history, roles, and key accomplishments

Senior Full-Stack Engineer

Self Employed

Jan 2022 - Jan 2025 (3 years)

Designed and developed scalable full-stack applications using Node.js, Fastify, and PostgreSQL, including REST API and GraphQL integration. Optimized application performance, integrated third-party services, and implemented PDF export for scheduling tools while improving user experience for 100,000+ monthly users in Agile/Scrum workflows.

Node Fastify REST APIs PostgreSQL GraphQL API Integration Agile Scrum

Senior Full-Stack Developer

Société Générale

Jan 2021 - Jan 2022 (1 year)

Served as a developer lead for backend (Sails.js, DynamoDB) and worked on frontend (React, React Native) for a social network mobile/web app. Built an MVP for the social network application.

React React Native Sails.JS DynamoDB

Senior Full-Stack Developer

Smartree

Jan 2018 - Jan 2021 (3 years)

Developed responsive landing page experiences aligned to Figma designs and improved performance using a Next.js foundation with routing and server-side rendering. Implemented page load optimizations including code splitting, image compression, and caching strategies.

Next.js Server Side Rendering Routing Caching Figma

Junior Full-Stack Developer

Starcounter

Jan 2017 - Jan 2018 (1 year)

Designed and developed new features for a university student management system and created components for the university accounting system. Analyzed and increased the stability and reliability of the accounting and student management systems.

Accounting Systems System Reliability

Senior Full-Stack Developer

HeroilStrtegies LLC

Architected a scalable React and TypeScript component library using Tailwind CSS and integrated Builder.io to provide a visual CMS for marketing teams. Built A/B testing infrastructure and optimized Core Web Vitals and front-end performance for fast, responsive experiences across mobile and desktop.

React TypeScript Tailwind Builder.Io A B Testing