Sanjay Kumar | Senior Software Developer

SUMMARY

Senior Software Developer with 3+ years of experience in backend development, API integration, and building scalable systems. Skilled in designing payment solutions, optimizing performance, and leading technical projects. Passionate about using technology to solve real-world problems efficiently.

PROFESSIONAL EXPERIENCE

Senior Software Development Engineer

Vegrow Chennai 04/2024 – Present

Built a multilingual voice agent prototype using Python 3.9 and Gemini Flash Exp with minimal latency; integrated Twilio/Exotel for telephony—projected to reduce ops manpower by 30%.
Developed a certified farm marketplace app using basic DASH protocol with caching—reduced video buffering by 35%.
Proposed and deployed infrastructure optimizations (NAT Gateway, CRON job migration to AWS EKS, SQL query optimization & indexing)—reduced API latency from 30s to 500ms.
Designed and launched Instant Payment Service using ICICI and Razorpay payout APIs—now handling 6,000+ monthly IMPS/UPI transactions worth ₹20 Cr+ with 99.9% success rate.
Engineered an in-memory graph-based material traceability system to improve ACP/ASP calculations—boosted pricing accuracy by 25%.

Software Development Engineer

Vegrow Chennai 04/2023 – 03/2024

Integrated Finbox, Finstack (bank analysis), KYC, and UPI APIs—automated credit checks and onboarding; reduced verification time by 80%.
Enforced business-specific credit/payment logic—cut overdue payments by 30%.
Built a SQL CDC microservice for real-time cache invalidation and audit logging—achieved 99.9% cache accuracy.
Developed a scalable Golang notification system for WhatsApp, Slack, SMS & Firebase—handled 1M+ messages/month with 98% delivery rate.

Software Development Engineer

Xoxoday Bangalore 06/2021 – 03/2023

Led integrations with HubSpot, ZohoCRM, SurveyMonkey, Typeform, and Zapier for reward workflow automation—increased new customer onboarding by 20%.
Contributed to core backend services for consumer transactions and 3rd-party APIs—processed 500K+ transactions with 99.8% uptime.
Improved reliability using Redis Bull queues and fail-safe logic—cut job processing time by 50%, reduced transaction failures by 35%.
Built scalable AWS-based services (Lambda, Cognito, SQS, SNS, SES, DynamoDB, EventBridge)—reduced infra costs by 20%.

EDUCATION

M.Sc. CS Integrated

CEG, Anna University 08/2016 – 04/2021 Chennai

KEY ACHIEVEMENTS

Instant Payment Service

Built and deployed a real-time Instant Payment Service, which became a major USP for the company among farmers—handling ₹20 Cr+ transactions monthly with 99.9% success rate.

2nd Place – Vetechathon

Won 2nd place in Vegrow Techathon for designing a high-impact backend solution.

TECHNICAL SKILLS

Languages & Frameworks

Golang, Python (3.9+), Ruby on Rails, Node.js, TypeScript, Express.js, HTML, CSS

Databases & Messaging

MySQL, PostgreSQL, MongoDB, Redis, Kafka, Amazon SQS

DevOps & Cloud Infrastructure

Docker, Kubernetes, Jenkins, GitHub Actions, CI/CD, AWS (Lambda, EC2, S3, DynamoDB, Cognito, SNS, SES, EventBridge), GCP

API Design & Architecture

RESTful APIs, Microservices, Webhooks, GraphQL

Tools & Integrations

HubSpot, ZohoCRM, SurveyMonkey, Typeform, Zapier, Razorpay, Twilio, Exotel, Firebase, Kaleyra, Slack, BotSpace

Testing & Monitoring

RSpec, Jest, Testify, Postman, New Relic, CloudWatch, Signoz