Software Engineer Senior

ALEXANDER MAZAKAS

SENIOR FULL-STACK ENGINEER

+1-765-***-**** ***************@*****.***

CAREER SUMMARY

Senior Software Engineer with 8+ years of experience building full-stack web applications using React, Next, Node.js, and TypeScript. I’ve designed and maintained scalable APIs, background job systems, WebSocket services, and cloud-based microservices on AWS. On the frontend, I build responsive, accessible and performant UIs with React, Next and TypeScript. Also integrated AI features into production systems, including GPT-4-powered services for content summarization and automation, and have experience deploying LLM-based tools via REST and SSE for real-time user interaction. Committed to delivering clean, maintainable code that enhances user experience and system reliability.

EDUCATION AND CERTIFICATION

B.S. in Computer Science

Florida State University, 2009 – 2013

Relevant Coursework: Software Engineering, Design Patterns, Database Management Systems, OOP, Web Architecture, Network Security.

TECHNICAL SKILLS

Programming Languages: JavaScript (ES6+), TypeScript, HTML5, CSS3, Node.js, C#, SQL

Frameworks & Libraries: React, Next.js, Redux, Vue.js, GraphQL, Express.js, Tailwind CSS, Bootstrap

Testing & Tools: Jest, React Testing Library, Cypress, ESLint, Prettier, Webpack, Vite, Storybook

DevOps & CI/CD: GitHub Actions, Azure DevOps, Docker, Kubernetes, NGINX

Database: PostgreSQL, MongoDB, Firebase, SQL Server

Cloud & Hosting: AWS (EC2, S3, Lambda), Azure, Netlify, Vercel

WORK EXPERIENCE

Senior Full Stack Developer Job Corps Austin, TX Sep 2022- Jul 2025

Led the end-to-end migration of a legacy ASP.NET MVC frontend to a modern React application using functional components and Hooks, resulting in a 30% improvement in page load speed and user engagement. Collaborated with design and product teams to refactor UI workflows, implement responsive layouts, and improve accessibility across key user journeys.

Developed a reusable component library in React, styled with Tailwind CSS and documented in Storybook, enabling consistent UI patterns and reducing feature delivery time across multiple teams by standardizing frontend development workflows.

Architected and led the migration from a monolithic Next.js application to a micro-frontend architecture using Next.js 14 and TypeScript, resulting in a 32% reduction in bundle size and improving Lighthouse performance scores to 97 across critical pages.

Designed and deployed a suite of Node.js microservices using Express and Prisma, orchestrated on AWS ECS Fargate, capable of maintaining 30,000+ concurrent WebSocket connections with 99.99% uptime across peak usage.

Integrated React Query and Zustand into the state management layer, eliminating over 60% of unnecessary component re-renders and reducing redundant API traffic by 35%, resulting in a significantly smoother user experience.

Engineered a gateway layer using Express.js that unified 12 downstream microservices via both REST and GraphQL interfaces, and introduced an OpenAPI-driven SDK generation pipeline to streamline frontend-backend integration.

Built and secured a role-based authentication system using JWT and refresh token rotation, supporting both web and mobile clients, and successfully passed a third-party security audit with zero critical findings.

Mentored a team of six engineers on advanced TypeScript practices, test-driven development using Cypress, and peer code review standards, contributing to a 40% increase in sprint velocity and higher overall code quality.

Designed and deployed an OpenAI GPT-4 powered microservice using Node.js and TypeScript to automate contract clause summarization, which reduced legal review time by 68% and contributed to a $2.3M ARR upsell opportunity.

Built a real-time React dashboard integrating Server-Sent Events (SSE) to stream GPT-4 completions with end-to-end latency under 400ms, enabling seamless AI interaction for over 15,000 daily users.

Senior Software Engineer SEA Electric Los Angeles, CA Mar 2019- Aug 2022

Built a modular frontend UI using React, TypeScript, Tailwind CSS, and Storybook, enabling cross-team collaboration on dynamic dashboards for telematics, vehicle diagnostics, and electrification status tracking for fleets powered by SEA Drive® systems.

Designed and maintained WebSocket services and event streams to monitor vehicle telemetry at scale; handled spikes of tens of thousands of concurrent connections with robust uptime and low-latency data delivery.

Championed CI/CD automation using GitHub Actions, automating linting, type-checks, testing, and deployments and decreasing deployment cycles from manual weekly releases to fully automated daily releases without interruption.

Collaborated with product and UX teams to translate complex electrification workflows—such as state-of-charge visualizations, battery data summaries, and charging events—into user-friendly interactive components.

Contributed to system architecture improvements, implementing a GraphQL gateway over a mix of REST microservices, supported by autogenerated SDKs from OpenAPI definitions to streamline frontend integration.

ed engineering mentorship and technical best practices initiatives, coaching developers on test strategies (e.g. Jest, Cypress), TypeScript typing patterns, and performance optimization; helped raise team velocity and code quality.

Middle Software Developer mTrip Toronto, Canada Aug 2016 - Feb 2019

Developed interactive frontend components in React and TypeScript for itinerary management and travel dashboards, enabling travelers to view trip details, offline maps, risk alerts, and payment integrations (e.g. TravelPerk, Troovo).

Built Express based middleware and API layers that consolidated itinerary data from various sources (GDS systems, OBTs, booking APIs), supporting white label flexibility for different client brands and enabling seamless integration across platforms.

Integrated real time traveler tracking and risk management features by consuming GPS or itinerary tracking services, surfaced through dashboards for duty of care monitoring and travel safety alerts.

Contributed to offline-first functionality, including PDF itinerary generation and in-app guides with interactive maps, ensuring reliability even without internet connectivity during trips.

Collaborated with UX and backend teams to align API contracts and frontend workflows, supporting multiple clients with customized branding and functionalities via a shared codebase and dynamic configuration patterns.

Participated in unit and integration testing efforts using Jest and React Testing Library, ensuring interface reliability across travel journeys and consistent performance in mission-critical features.

Frontend Developer Wavestone New York, NY Aug 2013 - Jun 2016

Built responsive dashboards using AngularJS and Highcharts for enterprise audit systems.

Integrated real-time updates using SignalR and Socket.io into SPAs.

Rewrote legacy jQuery-heavy pages into modular Angular components.

Delivered custom CMS UI used internally by non-technical teams.

Advocated for and implemented consistent code style with ESLint and Prettier.

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