Open to opportunities

Alex Jin

@thealexjin

Message

Full-Stack engineer crafting scalable, high-performance web platforms with elegant UX and AI features.

Bulgaria

Message

What I'm looking for

I’m looking for a team where I can build scalable products end-to-end—improving performance and conversion, shipping AI features thoughtfully, and shaping robust architectures that blend great UX with reliable backend engineering.

I’m a Full-Stack Engineer with 10+ years of experience designing and delivering scalable, high-performance web platforms across healthcare, digital publishing, IoT, e-commerce, and travel-tech. I architect microservice-based and modular monolith systems using Node.js, Nest.js, Spring Boot, Python, and cloud infrastructure on AWS/GCP.

I build rich, performant frontends with React, Next.js, and TypeScript, and I integrate AI-powered features using LangChain and the OpenAI API (including RAG pipelines and vector search). I’ve driven measurable impact through performance optimization and conversion improvements—contributing to $4M+ revenue growth through user-centric product development.

I also care deeply about maintainable engineering and team enablement: I’ve mentored engineers, shaped robust product architectures that bridge elegant UX with reliable backend work, and contributed to open source by helping maintain TinaCMS. Most recently, I’ve improved Core Web Vitals and instrumented frontend analytics to support data-driven decisions.

Experience

Work history, roles, and key accomplishments

Current

Frontend Engineer

Current

Examine.com Inc

Dec 2024 - Present (1 year 6 months)

Built and maintained user-facing features for a high-traffic nutrition and supplement research platform used by millions of users. Improved Core Web Vitals (CLS, LCP, INP), shipped conversion-focused landing pages and A/B tests for Examine+ growth, and implemented GA4-based frontend analytics across product teams.

React Next.js TypeScript A B Testing GA4 Conversion Optimization

Full Stack Engineer

Publi LLC

Aug 2022 - Nov 2024 (2 years 3 months)

Designed and implemented a microservice-based publishing architecture on Google Cloud Run using Nest.js, integrating PostgreSQL, TypeORM, and Upstash Redis/QStash for scalable content delivery and background job orchestration. Built an AI-powered editorial experience (Python, LangChain, OpenAI API), a Slate.js-based WYSIWYG editor, multi-tenant authentication with NextAuth, and deployed zero-downt

NestJS Microservices Python Lang Chain OpenAI API Google Cloud Run PostgreSQL Next.js Slate CI CD

Full Stack Engineer

GonnaOrder B.V.

Jun 2020 - Aug 2022 (2 years 2 months)

Architected a modular Spring Boot monolith powering a multi-tenant online ordering platform adopted by 600 merchants across 15 European countries. Delivered tenant-isolated REST APIs and async/event-driven integrations using AWS (SNS/SQS, RDS, Elastic Beanstalk), reducing release time by ~60% and incident response time by ~40%, while building merchant apps with Angular and Ionic plus real-time ord

Spring Boot AWS Elastic Beanstalk SNS SQS RDS PostgreSQL Angular Ionic WebSockets Event Driven Architecture

Senior Frontend Engineer

Home Tech Innovation, Inc.

Mar 2018 - Apr 2020 (2 years 1 month)

Led development of Suvie’s marketing and meal-planner apps (Next.js PWA) serving 10K daily active users and contributing to $2M in annual recurring revenue growth. Optimized SEO, Core Web Vitals, and WCAG 2.1 accessibility (organic traffic +30%, page load time -25%) and built a React Native mobile app for real-time smart-oven management, partnering with backend engineers to improve GraphQL and red

Next.js React Native Typescript Javascript SEO WCAG Accessibility GraphQL Cypress

Frontend Engineer

Sweet Inn

Feb 2016 - Mar 2018 (2 years 1 month)

Rebuilt Sweet Inn’s booking platform for a hybrid apartment + hotel model, adding modules for stay customization and contactless check-in, which boosted booking conversion by 22%. Delivered a responsive UI system and real-time property/pricing via Apollo GraphQL, Redux, and performance improvements (code-splitting, image lazy-loading, caching) that reduced page-load time by 35%, alongside TDD with