Lead records in the production platform context I worked on.
Software Engineer · Mumbai, India
I’m Ayush Saha. I build reliable backend systems for real-world products.
I’m Ayush Saha — a backend-focused software engineer working across Node.js, NestJS, AWS serverless infrastructure, and React. I enjoy solving problems around event-driven systems, partner integrations, reliability, observability, and operational tooling.
Selected impact
Engineering outcomes, not just tools.
A snapshot of the scale and improvements described in my professional work. Figures are based on project and platform context, not personal ownership of the entire platform.
Improvement in lead-processing reliability through queue resilience work.
Reduction in deployment ZIP sizes after shared Lambda-layer instrumentation changes.
Instrumentation initialization time after refactoring OpenTelemetry setup.
Selected work
Systems I’ve helped build.
A mix of production engineering, full-stack applications, and open-source work. Professional case studies are intentionally generalized where details belong to the employer or client.
Professional case study2026 — Present
Elixir LMS - Event-driven insurance integrations
Backend services for configurable partner onboarding and lead workflows. Work included validation and callback pipelines, asynchronous queue recovery, reconciliation, observability, and operational reprocessing tools.
Product engineering2024 — 2025
Digital donation kiosk
React Native donation kiosk serving 1M+ users and supporting 10M+ donations annually, with Razorpay QR and deep-link payments plus WhatsApp and SMS updates. Focused on transaction success and session reliability.
AI-powered product2025
Inner Heal — AI wellness companion
A MERN application for mood tracking and journaling, with Gemini-powered insights, authenticated APIs, and MongoDB aggregation pipelines.
Full-stack platform2023 — 2024
StudyNotion — EdTech platform
A course platform with authentication, OTP verification, password recovery, Razorpay payments, and Cloudinary media processing for instructors and learners.
Real-time applicationPersonal project
SmartChat — real-time messaging
A MERN chat application with Socket.IO messaging, JWT authentication, online presence, and persistent sessions.
Experience
Where I’ve worked.
Production delivery across enterprise insurance workflows and customer-facing mobile products.
Mar 2026 — Present
Software Engineer · Rezolut Infotech
Mar 2026 — Present · Building event-driven backend services for configurable partner onboarding and lead processing on an enterprise insurance platform handling 50M+ lead records. Core stack: Node.js, NestJS, AWS Lambda, Amazon SQS, Amazon SNS, MySQL, Sequelize, React 19, and TypeScript.
- Developed configurable partner onboarding and lead-processing services using Node.js, AWS Lambda, SQS, MySQL, and Sequelize.
- Strengthened lead-processing reliability by 30% through resilient asynchronous messaging with Amazon SQS, retries, message replay, and dead-letter queues (DLQs).
- Refactored OpenTelemetry integration across 4 AWS Lambda functions to reuse a shared Lambda layer, reducing deployment ZIP sizes by 77–83% and instrumentation initialization from approximately 750 ms to 80 ms; retained trace-correlated Winston logs in SigNoz.
- Revamped four Elixir admin modules using React 19 and TypeScript, delivering reusable components, custom hooks, pagination, filters, and operational tooling.
- Automated partner reconciliation with a NestJS service and scheduled IST execution, comparing forward and reverse feeds across 13 partner application IDs and 21 node groups; distributed reports through Amazon SNS.
- Delivered production fixes for HDFC partner workflows and built a secured batch-reprocessing endpoint supporting up to 2,000 leads with dry-run validation.
Nov 2024 — Apr 2025
Software Developer Intern · Hari Solution
Worked on a React Native donation kiosk serving 1M+ users and supporting 10M+ donations annually. Integrated Razorpay QR codes and deep links with WhatsApp and SMS payment-link flows, contributing to a 25% improvement in transaction success.
Technical toolkit
Tools I work with.
A practical stack across backend development, cloud infrastructure, frontend delivery, data, and production operations.
Languages
JavaScript (ES6+), TypeScript, Java, C++, SQL, Python
Backend & APIs
Node.js, NestJS, Express.js, REST APIs, Sequelize, TypeORM, JWT, SOAP/XML, API integrations
Cloud & DevOps
AWS Lambda, SQS, SNS, RDS, RDS Proxy, Secrets Manager, CloudWatch, Docker, ECS, CodeBuild, CI/CD
Frontend
React, React Native, Vite, Tailwind CSS, Ant Design, HTML5, CSS3
Data & Observability
MySQL, MongoDB, OpenTelemetry, SigNoz, Winston, structured logging
Engineering workflow
Git, GitHub, Jira, Postman, Linux, Agile/Scrum, debugging, production support
Open source
Contributing beyond my day job.
I value documentation, maintainability, and small improvements that make tools better for the wider developer community.
Express.js website · Pull Request #2112
Merged documentation and security-policy link correction in the official Express.js website repository.
expressjs/codemod
Contributed tooling maintenance by migrating the repository to Biome v2.3.11 and updating lockfiles.
Problem solving
Strong fundamentals through consistent practice.
Regular data structures and algorithms practice has strengthened my approach to logical reasoning, algorithm design, and debugging.
500+ DSA problems solved
Practice across LeetCode and GeeksforGeeks, covering problem-solving patterns, data structures, algorithms, and debugging.
A little about me
Engineer by practice. Curious by nature.
I’m a software engineer based in Mumbai, India, with a B.Tech in Computer Science and Engineering from Engineering College Bikaner, affiliated with Bikaner Technical University.
My strongest interest is backend engineering: designing APIs and integrations, making asynchronous workflows dependable, debugging production systems, and improving how services are observed and operated. I also enjoy building React interfaces when a problem calls for full-stack ownership.
Outside of day-to-day product work, I explore open source, build side projects, and write about technology and learning. I’m interested in teams that value sound engineering, thoughtful collaboration, and measurable product outcomes.
Current baseMumbai, Maharashtra, India
EducationB.Tech · Computer Science & Engineering
UniversityBikaner Technical University
Graduation2025
CGPA8.50 / 10
Primary focusBackend & cloud engineering
Also interested inDistributed systems · AI products · Open source
Contact
Have a challenging problem to solve?
For engineering roles, collaboration, or a conversation about backend systems, feel free to reach out.