AJ
Standing Rank
Rank Not Available
Developer Badges
Badges Pending
Skills & Technologies
56 skillsjavascripttypescriptpythonjavarubyreactnext.jsangularreact nativenestjsexpressspring bootruby on railsgraphqlslate.jsreduxzustandjotaitailwind cssawsgcpvercelherokudockerhasurapostgresqlmysqlmongodbdynamodbrediselasticsearchamazon snssqsgoogle pub/subcloud tasksupstashtinybirdjestcypressplaywrightmochatddunit & e2e testinggithub actionssentrydatadogcloudwatchgrafanaprometheusllm integrationlangchainrag pipelinesvector searchclaude codecursorcodex
Work Experience
Frontend Engineer
Examine.com Inc
Dec 2024 - Present Sofia, Bulgaria
- Built and maintained user-facing features for a high-traffic nutrition and supplement research platform serving millions of users
- Improved Core Web Vitals (CLS, LCP, INP) across content-heavy pages including supplement and condition pages
- Collaborated with marketing and sales teams to implement A/B tests, landing pages, and conversion-focused campaigns for Examine+ membership growth
- Optimized performance for membership and subscription flows supporting Examine+, Clinician Edition, and ExamineAI products
- Instrumented and maintained frontend analytics using GA4 to support data-driven decision making across teams
Full Stack Engineer
Publi LLC
Aug 2022 - Nov 2024 Sofia, Bulgaria
- Designed and implemented microservice-based publishing architecture using Nest.js on Google Cloud Run, integrating TypeORM, PostgreSQL, and Upstash Redis/QStash for scalable content delivery and background job orchestration
- Built an AI-powered editorial experience with Python, LangChain and OpenAI API, enabling auto-summarization, SEO tag generation, and writing assistance within the editor
- Developed a Slate.js-based WYSIWYG content editor in Next.js/React/TypeScript, supporting drag-and-drop blocks, embedded media, and collaborative editing with real-time state persistence
- Engineered NextAuth-based authentication with multi-tenant access control, supporting team workspaces, domain-restricted publications, and OAuth providers
- Leveraged Upstash QStash and Google Cloud Tasks for distributed task scheduling, ensuring reliable delivery of async jobs like AI processing, content indexing, and webhook notifications
- Deployed and optimized the platform on Vercel and Google Cloud Run, achieving high performance and zero-downtime CI/CD using environment-aware build pipelines
- Established component-driven UI architecture with Tailwind CSS and design tokens for branded, responsive, and accessible digital publications used by multiple editorial teams
Full Stack Engineer
GonnaOrder B.V.
Jun 2020 - Aug 2022 Sofia, Bulgaria
- Architected a modular monolith in Spring Boot powering a multi-tenant online ordering and order-management platform adopted by 600+ merchants across 15+ European countries
- Designed and deployed REST APIs and a PostgreSQL (RDS) data layer with tenant-based isolation and auditing, hosted on AWS Elastic Beanstalk with blue/green deployments and automated CI/CD using GitHub Actions, reducing release time by ~60%
- Developed and maintained the web, mobile, and desktop apps for merchants using Angular 8+, and Ionic, implementing WebSocket-based real-time communication to instantly deliver new order alerts and trigger automatic receipt printing on connected devices
- Implemented asynchronous, event-driven communication between internal modules using Amazon SNS and SQS, improving reliability of background tasks such as order notifications and third-party integrations, and increasing system resilience under load
- Managed Secrets Manager and CloudFormation for secure, reproducible infrastructure; leveraged CloudWatch dashboards and alerts that reduced incident response time by ~40%
Senior Frontend Engineer
Home Tech Innovation, Inc.
Mar 2018 - Apr 2020 Sofia, Bulgaria
- Led the development of Suvie’s marketing and meal-planner apps (Next.js PWA) serving 10K+ daily active users, driving $2M+ in annual recurring revenue growth through subscription-based meal services
- Optimized SEO, performance, and WCAG 2.1 accessibility, increasing organic traffic by 30% and reducing page load time by 25% through Core Web Vitals enhancements
- Collaborated with design and marketing teams on A/B testing of tailored brochure versions for specific user segments, analyzed performance using GA4 and GTM, and delivered a ~20% increase in conversion rate and user retention
- Spearheaded the development of Suvie’s mobile app using React Native, Expo, and AWS IoT SDK providing a seamless UX for real-time smart-oven management
- Partnered with backend engineers using Rails, Solidus, and Hasura to design scalable data models and role-based GraphQL APIs, reducing API development time by 60% and cutting latency by 30%
- Established automated code-quality checks using ESLint, Prettier, and GitHub Actions, and implemented comprehensive unit and e2e testing with Jest and Cypress to ensure reliable, maintainable releases; mentored two frontend engineers on these workflows and best practices in code review and CI/CD
Frontend Engineer
Sweet Inn
Feb 2016 - Mar 2018 Sofia, Bulgaria
- Rebuilt Sweet Inn’s booking platform to support its hybrid “apartment + hotel” model, adding new modules for personalized stay customization, contactless check-in via smart locks, integrated customer-service chat, and dynamic pricing—boosting booking conversion by 22%
- Designed and implemented a modular, responsive UI system using React, Next.js, and Styled Components, ensuring cross-device consistency across 5+ international markets
- Integrated Apollo GraphQL and Redux to deliver real-time property and pricing data for 1,000+ listings, improving responsiveness and data integrity between client and backend services
- Enhanced performance with route-level code-splitting, image lazy-loading, and caching optimizations, reducing page-load time by 35% and improving Lighthouse SEO scores.
- Practiced full Test-Driven Development (TDD) using Jest, Mocha, Enzyme, and Cypress, achieving comprehensive coverage across unit, integration, and end-to-end testing flows
Projects
TinaCMS
View ProjectCMSOpen Source
- Collaborated with the founders & core team to maintain TinaCMS, an open-source Git-backed headless CMS with 13K+ GitHub stars
- Implemented new features and integrations, authored technical documentation, and resolved community-reported issues to improve stability and developer experience
- Assisted with customer onboarding and technical migration from Forestry to TinaCMS (including enterprise clients like Smashing Magazine)
Leaderboard Standings
Leaderboard Position Pending
Global test scores, peer standing percentiles, and algorithm leaderboard ranks are updated dynamically.
Assessment Highlights
Assessments Not Completed
Coding evaluations, system assessment results, and conceptual score badges will appear here after taking a test.
AI Collaboration Score
AI Collaboration Score Pending
Developer coding behavior, assistant cooperation, and AI pair-programming indicators are evaluated during live coding sessions.
Role Compatibility Profile
Role Compatibility Analysis Pending
Custom matching reports, candidate role compatibility percentiles, and core engineer strength profiles are processed once conceptual code screenings are complete.
Achievements
Revenue Growth Contribution
Contributed to $4M+ revenue growth through performance optimization, conversion improvements, and user-centric product development.
About Details
Professional Bio
Experienced Full-Stack Engineer with 10+ years designing scalable web platforms across healthcare, IoT, and e-commerce. Skilled in Node.js, Python, React, and AWS/GCP cloud infrastructure. Proven track record of driving revenue growth through performance optimization and user-centric development.
Bachelor’s Degree in Computer Science (Engineering)
Fudan University (2010 - 2014)
Languages: English, Hindi
Email: Locked
LinkedIn: https://linkedin.com/in/thealexjin
GitHub: https://github.com/thealexjin