Sachin Kumar

As a freelance backend developer, I am driven by a strong sense of autonomy and self-reliance, thriving on the independence my work offers. I approach every challenge with a logical and diligent mindset, committed to building robust and efficient systems.

Experience

Freelance Backend Developer

Freelance · Jun 2023 – Present

Not yet confirmed

• Designed and shipped 4 production-grade applications across e-commerce, auth, messaging, and microservice domains – all independently architected from database schema to deployment.
• Reduced redundant database reads by ~60% on the Urban Stitch platform by introducing Redis caching for frequently accessed product and category data, cutting average API response times noticeably.
• Prevented inventory overselling under concurrent load by implementing Redis-based reservation locking with automatic TTL expiry in the Inventory Service, eliminating race conditions on stock deductions.
• Hardened authentication across projects with JWT refresh-token rotation, Redis blacklisting of invalidated tokens, OTP-based password reset, and multi-layer brute-force rate limiting.

What drives their work

The Architect

Before acting, you envision the complete, logical structure.

Sachin's superpower

You excel at designing and implementing complex backend systems that are both functional and secure.

How Sachin works

You are best suited for roles in small to medium-sized teams where you can take ownership of backend systems and contribute significantly to their design and implementation.