Avinash Kumar

Backend Software Engineer

Mumbai, India 3+ yrs exp 88 · Excellent

About

Backend Software Engineer with 4.2 years of experience specializing in building scalable systems using Node.js, TypeScript, GraphQL, and PostgreSQL. Demonstrated expertise in REST APIs, event-driven architecture, and Salesforce CPQ integrations, with a strong focus on cloud infrastructure using AWS and Azure. Proven track record in optimizing performance, implementing automation, integrating AI, and ensuring system reliability across Web3, ERP, and CPQ domains.

Skills & Expertise (28)

Node.js Advanced

8.5/10

Years Exp

Typescript Advanced

8.2/10

Years Exp

JavaScript Advanced

8.0/10

Years Exp

REST API design Advanced

7.8/10

Years Exp

GraphQL Intermediate

7.5/10

Years Exp

MongoDb Intermediate

7.0/10

Years Exp

Postgresql Intermediate

7.0/10

Years Exp

Docker Intermediate

6.5/10

Years Exp

AWS Intermediate

6.5/10

Years Exp

Event-Driven Architecture Intermediate

6.0/10

Years Exp

JWT Authentication Intermediate

6.0/10

Years Exp

Git Intermediate

6.0/10

Years Exp

Supabase Intermediate

5.5/10

Years Exp

Salesforce CPQ Intermediate

5.0/10

Years Exp

Redis Intermediate

5.0/10

Years Exp

Webhooks Intermediate

5.0/10

Years Exp

Next.js Intermediate

5.0/10

Years Exp

Jest Intermediate

4.5/10

Years Exp

Mocha Intermediate

4.5/10

Years Exp

IPFS Intermediate

4.0/10

Years Exp

Web3 Intermediate

4.0/10

Years Exp

System Design Intermediate

4.0/10

Years Exp

RBAC Intermediate

4.0/10

Years Exp

API Security GitHub Azure Blob Storage NestJS Express.js

Work Experience

Software Engineer – Backend

Sigma Solve, Inc.

Jan 2025 - Mar 2026

Built scalable backend services using Node.js, TypeScript, and Next.js API Routes, integrating Salesforce CPQ for complex multi-tier pricing workflows and automated quote generation at scale. Designed high-performance REST APIs for bulk Excel/CSV data processing, improving pricing efficiency by 30%+ engineered secure file pipelines via Azure Blob Storage with signed URLs. Automated workflows using pg cron and webhooks, reducing manual backend operations by 40%; implemented event-driven architecture for real-time Salesforce CRM ↔ Supabase/PostgreSQL sync.

Node.js Backend Developer

Biz Technologies IT Solutions

Mar 2023 - Dec 2024

Architected full backend for a Web3 marketplace supporting NFT trading, virtual land ownership, and digital asset transactions with smart contract integration on the blockchain. Developed decentralized REST APIs for scalable asset discovery, transaction processing, and ownership verification, inspired by patterns from large-scale virtual ecosystems like Decentraland. Integrated IPFS with MongoDB for a hybrid storage layer – IPFS for immutable asset data, MongoDB for structured metadata – and optimized queries to reduce API response time by 10–15%. Led end-to-end backend ownership of asset lifecycle including minting, transfers, rental logic, and marketplace transactions with full blockchain and database consistency.

Node.js Backend Developer

Red Roots India Pvt. Ltd

Apr 2022 - Mar 2023

Built and maintained scalable ERP backend systems using Node.js and PostgreSQL covering HR, sales, inventory, and vendor operations for a mid-sized enterprise client. Developed an automated expense management module with multi-level approval workflows, reducing HR processing workload by 20% and improving finance team visibility. Improved overall API performance by 20% through targeted query optimization, strategic indexing, and response caching, resulting in faster page loads and better UX. Implemented role-based access control (RBAC) and secure JWT-based authentication, ensuring fine-grained authorization across all ERP modules and protecting sensitive employee data.