Ahsan Ahmed

Senior Full Stack Engineer

Lead Generation for Contractors | Plumbing, HVAC, Roofing, Concrete, etc Leads | Local Businesses • Período integral

Jul 2025 - May 2026 • 10 mos

Owned full-stack development on an AI-powered B2B SaaS platform handling millions of records a month, across React frontends, Node.js/BullMQ backend services, and AWS infrastructure. • Built a distributed Elasticsearch cluster with ClickHouse for OLAP analytics, cutting query cost while keeping performance fast • Re-architected the data-export system into a batch model processing 100+ jobs in parallel (was sequential) • Shipped V2 campaign infrastructure: BullMQ scheduler, Gmail Watch, Microsoft Graph, and DNS/health-check systems • Designed and deployed an AI feature end-to-end using a RAG pipeline on AWS Bedrock • Owned deployments across 3 production servers, database migrations, and critical hotfixes Stack: React, Node.js, BullMQ, MongoDB, Redis, Elasticsearch, ClickHouse, AWS (Bedrock)

Senior Full Stack Engineer

Venture Backed • Período integral

Feb 2024 - Jul 2025 • 1 yr 5 mos

Delivered full-stack web applications for multiple clients across FinTech, HealthTech, and no-code platforms. • Architected a 3-role HealthTech recovery platform (Doctor / Patient / Hospital Admin) with Next.js, NestJS, PostgreSQL, WebRTC/Twilio video, and wearable integrations (Apple HealthKit, Google Fit) • Led a FinTech security incident response: contained unauthorized access, rotated credentials, and fully restored production within 72 hours, then ran a full codebase audit • Built CMS, e-commerce, and drag-and-drop modules for a no-code app builder Stack: Next.js, React, NestJS, Node.js, PostgreSQL, MongoDB, AWS, WebRTC

Senior Frontend Developer

Shipper List • Período integral

Dec 2021 - Apr 2023 • 1 yr 4 mos

Built and maintained a production Next.js web app. • Developed a server-side-rendered app in Next.js integrated with a headless CMS (Prismic) via GraphQL and Tailwind CSS • Implemented SEO meta tags and dynamic routing to improve organic search visibility • Improved initial page load times by ~40% through code splitting, caching, and lazy loading Stack: Next.js, JavaScript, GraphQL, Prismic CMS, Tailwind CSS