Headline

Backend Developer @CoinDcx | Specializing in Rails, NodeJS, Blockchain & Fintech | NSUT 24

About

Backend Engineer with 2+ years of experience building high-scale distributed systems in fintech. Currently at CoinDCX, owning systems that serve 20M+ users at 1.7K RPS. I work at the intersection of reliability and scale auth, KYC, payments, and event-driven pipelines where correctness is non-negotiable. What I've shipped: → Cut P99 latency 70% (41ms → 12ms) on a service handling 6M req/hr via Redis caching → Built an autonomous SMS circuit breaker that eliminated manual vendor failover entirely → Reduced KYC turnaround 65%, driving +6% activation conversion for 20M+ users → Built Kafka event pipelines with idempotency, DLQ, and exponential backoff at scale Stack: Node.js · TypeScript · Ruby on Rails · PostgreSQL · Redis · Kafka · AWS · Docker Beyond work: → Built LLD Playground — 37 system design problems used by 5,000+ developers from 30+ countries, recommended by ChatGPT, Claude, Gemini & Perplexity → 900+ LeetCode problems · Peak rating 1714 · All India Rank 359 Open to SDE-1/2 Backend roles at product-based companies in Delhi NCR (open to Pan-India). vivek.nsut@gmail.com

Location

Delhi

AI stack

antigravity

codex

claudecode

Work experience

Back End Developer at CoinDCX, Apr 2025 - Present · 1 yr 5 mos, Bengaluru, Karnataka, India, 1. Cut P99 latency ~70% (41ms to 12ms) on validate_token (~6M req/hr, 1.7K RPS) by designing a Redis hash-map cache (cache-aside + TTL + invalidation), eliminating ~95% PostgreSQL SELECTs. 2. Built an in-house SMS circuit breaker in Node.js + TypeScript tracking vendor health scores (error rate + latency) in Redis via webhooks – auto-routes traffic to healthy vendors and retries failed messages, reducing SMS delivery failures to near 0% and eliminating manual config intervention. 3. Built a Kafka-backed event-routing layer in the Customer Engagement Service integrating AppsFlyer S2S attribution across 4 apps with idempotent event IDs, retries, and DLQ; sustained <2ms per-event overhead. 4. Reduced KYC median TAT 65% (148s to 52s) for 20M+ users by architecting Reverse Penny Drop flow on Ruby on Rails, driving +5% KYC to BAV and +6% Signup to NAP conversion uplift. 5. Reduced daily session drops 80% (800+ to 150) across iOS, Android, and Web by root-causing auto-logout issues using Datadog distributed traces and PagerDuty triage. 6. Engineered a vendor-agnostic sanctions-screening adapter with active-active failover (LexisNexis to Zigram), delivering zero-downtime migration and full audit traceability. 7. Improved city-level GeoIP accuracy from 61% to 97% by automating MaxMind refreshes with GitHub Actions CI/CD, reducing location decisioning errors to <3%.

Software Engineer at Odenkirk Private Limited, Dec 2024 - Mar 2025 · 4 mos, Remote, Lifted user retention 20% by rearchitecting mentor-dashboard data flows and community-feed pagination on Node.js + MongoDB, improving API reliability for 600+ active users. Shipped booking, editing, and cancellation REST APIs end-to-end; resolved 15+ production bugs across scheduling and payment workflows, cutting user-reported errors by 30%.

Junior Software Engineer at OnFocus Soft, May 2024 - Nov 2024 · 7 mos, Remote, 1. Built authentication flow, REST APIs, and core features (posts, stories, events, likes) for a real estate–focused social media app with 100+ daily active users. 2. Designed and developed an admin dashboard in React.js to manage 1000s of users and real estate listings. 3. Optimized MongoDB queries and API performance, reducing response times and improving scalability.

Research Intern at Netaji Subhas University of Technology, Jun 2023 - Jul 2023 · 2 mos, New Delhi, Delhi, India

Education

Bachelor of Technology, Electrical and Electronics Engineering, Netaji Subhas University of Technology (NSUT, Formerly NSIT)

Public links

github: https://github.com/vivek-panchal