PRODUCTION SYSTEMS & COMMUNITY LEADERSHIP

WORK EXPERIENCE

Architecting transactional billing backends, stress-testing systems to 1,000+ concurrent users, and mentoring university engineers in cloud computing.

freelance// 5,500+ Line OpenAPI Spec • Headless PDF Engine

Freelance Backend Developer

Smile Care Dental Clinic

2025

Remote

Architected a modular production REST API applying Clean Architecture with decoupled repositories, transactional billing, and async BullMQ/Redis worker pipelines.

Architected a modular REST API in TypeScript, Node.js, and Express.js, applying Clean Architecture with decoupled repositories and centralized dependency injection.

Built an automated billing engine on PostgreSQL transactions that generates dynamic PDF invoices via headless Puppeteer and Mailgen.

Designed a resilient BullMQ/Redis worker system for async email and invoice delivery, with exponential-backoff retries and concurrency control.

Hardened patient-data security with JWT auth (refresh rotation), TOTP/2FA, strict schema validation, and tiered rate limiting.

Authored a 5,500+ line OpenAPI 3.0 (Swagger) spec that streamlined UI integration and enabled automated API testing.

TypeScriptNode.jsExpress.jsPostgreSQLRedisBullMQPuppeteerOpenAPI 3.0JWT / 2FA

leadership// Stress-Tested to 1,000 Concurrent Users • 250+ On-Campus Participants

Backend Lead — Chakravyuh Event

IEI Students' Chapter of CSE, Academy of Technology

Oct 2025 – Present

Hooghly, West Bengal

IEI Students' Chapter of CSE, Academy of Technology — Event Visual

Served as Backend Lead for Chakravyuh, building high-throughput PostgreSQL/Redis/Drizzle ORM data pipelines, real-time WebSocket leaderboards, and automated moderation.

Served as Backend Lead for Chakravyuh, the community's largest on-campus event with over 250+ participants, building its backend in Node.js, TypeScript, and Express.

Built a PostgreSQL/Redis/Drizzle ORM data layer stress-tested to 1,000 concurrent users.

Shipped real-time WebSocket leaderboards, an anti-cheat auto-banning system, and automated slot scheduling.

Implemented the participant ban/moderation system end-to-end and coordinated directly with the frontend team to keep UI in sync with backend state changes.

Cut integration friction by authoring an event-end auto-submitter and a centralized admin dashboard for the frontend team.

Node.jsTypeScriptExpress.jsPostgreSQLRedisDrizzle ORMWebSocketsSystem Design

community// 250+ Day-1 Registrations • RazorPay Webhook Integration

Technical Associate

InnovateX Engineers Community

Aug 2026 – Present

Hooghly, West Bengal

InnovateX Engineers Community — Event Visual

Led full-stack engineering of the Connect event platform on Next.js and MongoDB, handling end-to-end domain routing, payments, and SEO.

Led full-stack development of the Connect event website on Next.js and MongoDB, scaling to 250+ registrations on day one.

Built a secure RazorPay webhook payment flow with Google Authentication and rate-limited ticketing.

Registered and configured the InnovateX domain end-to-end — custom routing, mail, and SEO — improving search crawlability.

Next.jsReactMongoDBRazorPayGoogle AuthTailwind CSSSEO

cloud// Inaugural Event Speaker • Cloud Mentorship

Tech Team Member & Workshop Co-Host

AWS Cloud Club AOT

Jun 2026 – Present

Hooghly, West Bengal

Session Poster #1

Session Poster #2

Co-hosted cloud computing workshops and taught student developers how to deploy, manage, and scale real-world applications on AWS infrastructure.

Co-hosted 'Introduction to AWS' at the club's inaugural event, covering core cloud concepts for university students.

Taught attendees to deploy and manage real-world applications on Amazon EC2 and AWS Lambda with automated deployment pipelines.

Amazon EC2AWS LambdaAWS S3Cloud ArchitectureDevOps

Interested in bringing this architectural discipline to your team?

Srayash Raj is available for high-throughput backend roles, distributed cloud systems, and Flutter applications.

CONNECT WITH SRAYASH RAJ ↗