Backend & Microservices at Scale
Designing and building Java / Spring Boot microservices for high-throughput transaction processing (20K–30K TPS) with Eureka Server for service discovery in distributed architectures.
Backend
Java + Spring Boot
APIs
REST + SOAP
About Me
I build backend systems and full-stack products that solve real problems.
Hello, I am Saurabh Kumar Singh, a Software Engineer focused on scalable backend systems, clean API design, full-stack delivery, and problem-solving. Software engineer with hands-on experience building scalable microservices and payment systems using Java, Spring Boot, and Oracle DB, alongside a full-stack foundation in MongoDB, Node.js, Express, React, and Python. Comfortable across UPI systems, REST and SOAP APIs, distributed architectures, backend testing, and system design, with additional exposure to Docker, Kubernetes, Kafka, and Redis. I have shipped production backend modules processing tens of thousands of transactions per second, alongside side projects spanning search engines, job portals, and expense tracking tools.
I completed my Bachelor of Engineering in Information Technology from Army Institute of Technology, Pune with CGPA 8.11.
1+ Yrs
Professional experience
30K
TPS scale delivered
1418
Codeforces max rating
10+
Real-time projects
Experience & Education
Where I've built and learned.
Experience
Software Engineer
Oracle Financial Services Software Limited
July 2025 – PresentPune, Maharashtra
- Contribute to backend modules across UPI payment workflows on a large-scale banking platform serving millions of daily transactions, improving reliability and reducing production incidents.
- Designed and built 5+ backend microservices from scratch using Java and Spring Boot, supporting transaction processing at 20K–30K TPS with Eureka Server for service discovery.
- Performed API validation and backend testing across 50+ endpoints using Postman, cutting manual regression testing time by an estimated 30% through an internal automation framework.
- Integrated and maintained enterprise technologies including Oracle DB, Flexcube, and WebLogic Server, resolving 20+ production and backend defects across deployment cycles.
Education
B.E. in Information Technology
Army Institute of Technology, Pune
Oct 2021 – July 2025Pune, Maharashtra
- Graduated with a CGPA of 8.11, with a strong foundation in Data Structures, Algorithms, DBMS, Operating Systems, and Computer Networks.
- Built a strong competitive programming track record, including a Codeforces Specialist rating and multiple contest wins.
- Applied coursework to real projects spanning search systems, job portals, and full-stack web applications.
Background
How I approach engineering.
I think like a builder: understand the problem, design the data flow, ship the first useful version, test the APIs, harden it for scale, and keep the system maintainable enough to grow.
Payments & UPI Systems
Hands-on experience with UPI payment workflows, transaction reliability, and backend modules powering a large-scale banking platform.
API Validation & Testing
Validating and testing REST/SOAP endpoints with Postman and internal automation frameworks, cutting manual regression effort significantly.
Full Stack Development
Building complete web applications with React, Node.js, Express, MongoDB, authentication flows, dashboards, and clean UI experiences.
Competitive Programming
Specialist at Codeforces with max rating 1418, Global Rank 130 in CodeChef Starters 82 Division 3, and winner of DSA Craft.
Engineering Foundation
Bachelor of Engineering in Information Technology from Army Institute of Technology, Pune with CGPA 8.11.
Capabilities
What I can build.
From backend services to frontend screens, I can work across the full product flow: APIs, database, authentication, distributed systems, integrations, testing, and deployment preparation.
React
Frontend
Oracle DB
Database
Backend microservices at scale
Building Java and Spring Boot microservices for UPI transaction workflows, handling 20K–30K TPS with Eureka Server-based service discovery.
Payment & UPI reliability
Working on backend modules for a large-scale banking platform, reducing production incidents across transaction workflows.
API validation & automation
Testing and validating 50+ REST/SOAP endpoints with Postman, backed by an internal Java-based automation framework.
Full stack & ML side projects
Shipping React/Node full-stack apps and ML-driven tools, including a BERT-powered semantic search engine.
Skills
Backend depth, full-stack breadth.
Java
Spring Boot
Microservices
Eureka Server
System Design
MongoDB
Express.js
React
Node.js
JavaScript
REST APIs
SOAP APIs
Python
C++
SQL
Oracle DB
Redis
Kafka
Docker
Kubernetes
UPI & Payments
Postman
API Testing
Git
Linux
AI-native Development
JFrog
Problem Solving
Achievements
Problem-solving signals.
Specialist at Codeforces with a maximum rating of 1418.
Achieved Global Rank 130 in CodeChef Starters 82 Division 3 among 9342 participants.
Winner of DSA Craft competition organized by MKSSS's Cummins College of Engineering.
Qualified for the Finals of CODEFT Solutions coding competition at AIT Pune.
Shortlisted for the Education Scholarship Scheme for Army Personnel (ESSA) for AY 2022–23 and 2023–24.