Sunil Tomar

• Infrastructure & Platform Ownership
  Led org-wide migration from Squadcast to AWS Incident Manager, reducing cost by 90% and onboarding 35+ teams.
  Migrated Kubernetes secrets to HashiCorp Vault, designed Helm-based onboarding flow, and standardized secure secrets handling for more than 120 micro services.
  Designed centralized error handling library (ErrorCommons) across services using RFC-compliant structure, improving API reliability and DX.
• Backend Systems & Architecture
  Delivered high-throughput systems (7.8K QPS, 800+ orders/sec) with multithreading, reactive programming, and virtual threads.
  Spearheaded a custom rate limiter in Go using goroutines and channels; deployed via Kubernetes to safeguard critical APIs.
  Led Java upgrades (11 → 17 → 21) across core services, improving performance, compatibility, and developer efficiency.
• Product & Delivery Leadership
  Architected self-serve onboarding platform for connected banking; enabled dashboard-based lead intake and API credential generation.
  Merged payout and bulk transfer services by unifying codebases, DB schemas, and access layers with zero-downtime.
  Reduced cache latency for merchant config APIs; optimized TTLs across layers to eliminate incident-prone bottlenecks.
• Cross-Functional Impact: Delivered UAE market services, including VA offering, Telr PG integration, and infra setup across 25+ services.
  Built a bulk webhook queue using SQS and Go threading; enabled retry and replay for high-volume webhook systems.
  Created transaction reporting engine with support for scheduled, filtered, and real-time exports for ops visibility.
• Mentorship & Engineering Culture
  Took 25+ interviews across SDE2/SDE3 roles; contributed to hiring, campus drives, and bar-raising.
  Mentored multiple engineers (SDE3, SDE2, intern) across feature ownership, code quality, and delivery velocity.
  Actively led sprint planning, retros, and contributed to SDRC design reviews and org-level technical discussions.

Company Overview: ZestMoney is a consumer lending AI based fintech company

• Loan Repayment Systems: Led development and optimization of core repayment workflows, handling EMIs, prepayments, and partial payments with complex validations and edge cases.
• Microservices Architecture: Designed and built scalable services in Java (Spring Boot) replacing legacy C#/.NET modules, reducing operational overhead and improving service maintainability.
• .NET to Java Migration: Spearheaded migration of critical loan management services, reducing AWS infra cost and simplifying deployment pipelines.
• Payment Gateway Integrations: Integrated with PGs and banks to automate loan repayments, reconciliations, and auto-debit flows (eNACH).
• Performance Optimization: Refactored memory-intensive flows, implemented asynchronous processing, reducing API latency and improving system throughput.
• Cross-Team Collaboration: Worked closely with Credit Risk, Product, and Ops teams to fine-tune repayment rules and exception handling logic.

• Enterprise Web Application Development: Built and maintained enterprise-grade web solutions for Fortune 500 clients using .NET stack.
• TDD & SOLID Principles: Practiced clean code, unit testing, and reusable components to improve long-term code maintainability and onboarding efficiency.
• Postage Charge Engine: Developed a highly optimized postage computation module; reduced execution time by 40% through algorithm tuning and async execution.
• Agile Delivery: Delivered sprint-based modules in customer portals and admin panels with quick turnaround cycles and continuous deployments.
• Client-Facing Exposure: Participated in requirement gathering, grooming sessions, and weekly demo meetings, ensuring alignment with client expectations.