Resume

Sayan Mondal

Senior Software Engineer & Tech Lead — Kolkata, India.

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Jul 2022 — Present

Senior Backend Engineer & Tech Lead

Drivado — Chauffeur & Mobility Platform
  • Led backend architecture and a 15+ engineer cross-functional team for a global chauffeur and mobility platform operating across 400+ cities.
  • Built an LLM-powered location normalization service using OpenAI, Mapbox, and LangSmith, reducing manual location searches from 50% of bookings to 1–2%.
  • Improved booking performance by 3× (speed of booking conversion from search) and user engagement by 2× through backend optimization, 70% faster search, Redis caching, and automated billing, invoicing, and payment flows.
  • Migrated booking workflows from Redis Pub/Sub to Kafka to reliably process 300K+ daily events, retain event history, and enable consumption across multiple services.
  • Designed a zone-based pricing engine using polygon matching and layered rules for markups, discounts, and night/event charges, delivering pricing under 700ms.
  • Owned production infrastructure with Docker, Kubernetes, NGINX, and GitHub Actions, reducing infrastructure costs by 53% while supporting 500+ RPS.
  • Hardened payment APIs with Cloudflare WAF to support PCI DSS compliance.
Jan 2020 — Jul 2022

Founding Engineer

Rising Leafs — EdTech Platform (WEBEL-BCC&I)
  • Co-founded and built a role-based learning platform using Node.js, Express, React, and MongoDB, onboarding 500+ users.
  • Redesigned backend APIs and frontend workflows, increasing platform engagement by 30%.