Abhishek Singh

Backend Engineer

Bengaluru, India 1+ yrs exp 83 · Excellent

About

Software Development Engineer with 1.5+ years of experience building scalable backend systems using Java and Spring Boot. Skilled in designing high-performance RESTful APIs and PostgreSQL query optimization, achieving 80%+ latency reduction in production systems. Experienced in working with microservices architecture, distributed systems, and asynchronous workflows to improve scalability and system reliability. Hands-on experience with payment integrations and production-grade backend development.

Skills & Expertise (20)

Java Intermediate

7.7/10

Years Exp

RESTful APIs Intermediate

7.5/10

Years Exp

Spring Boot Intermediate

7.4/10

Years Exp

Postgresql Intermediate

7.2/10

Years Exp

Spring Security Intermediate

7.0/10

Years Exp

MySql DBMS Data Structures and Algorithms Object-Oriented Programming DBeaver IntelliJ Postman Docker AWS Git Hibernate JPA JUnit 5 SQL Python

Work Experience

Software Development Engineer I

Prosperr.io

Apr 2025 - Apr 2026

Designed and developed scalable REST APIs in Java (Spring Boot) for payroll, FBP, and financial workflows, improving system modularity and throughput. Optimized complex PostgreSQL queries (joins, indexing, restructuring), reducing API latency from ∼7s to ∼1.23s (80%+ improvement). Built CSV-based bulk ingestion pipelines with validation, error handling, and automated reporting, reducing manual effort and data-entry errors. Implemented asynchronous payment workflows (polling + fulfillment) to manage subscription lifecycle states, improving processing reliability. Designed feature-flag-driven rollout strategies to safely migrate legacy systems with zero downtime. Developed HRMS integration workflows for employer onboarding and organization mapping, improving data synchronization efficiency. Secured APIs using HMAC authentication and Spring Security, and implemented field-level encryption for PII data.

Software Developer Intern

TCR Innovation

Sep 2024 - Feb 2025

Developed backend modules in Java using IntelliJ IDEA, applying object-oriented design principles to improve system scalability. Implemented features and resolved bugs using strong analytical and problem-solving skills. Collaborated with team members to design, test, and debug software features in an agile development environment. Demonstrated ownership, dedication, and professionalism while delivering assigned tasks within deadlines.