Abhishek Singh

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.

Software Development Engineer I - Prosperr.io - Bengaluru, India

(2025-04 - 2026-04)

• 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 - Navi Mumbai, Maharashtra

(2024-09 - 2025-02)

• 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.

B.Tech - Computer Science and Engineering - United College of Engineering and Research (2020-08 - 2024-07)