Sumit Kumar

Sumit Kumar

Work style

Remote

Contact details — on requestProof of Work — on request

Experience

Lumber

Software Developer

Lumber · Aug 2025 – Present

Not yet confirmed
L

Software Engineer

Lumberfi · Aug 2025 – Present

Not yet confirmed
  • Wrote and shipped 75+ production REST API components in Java / Spring Boot with PostgreSQL - applying software design best practices (style guidelines, testability, accuracy, efficiency) through active peer code reviews.
  • Triaged, debugged, and resolved 150+ production issues by analyzing root causes across service operations, database layers, and data processing pipelines - consistently meeting SLA and reliability targets.
  • Built a distributed scheduled job system (Quartz) with timezone-aware configurations for automated operational workflows - eliminating manual interventions and improving service uptime.
Lumber

Software Developer Internship

Lumber · Feb 2025 – Aug 2025

Not yet confirmed
  • • Developed function-based RESTful APIs using Spring Boot and PostgreSQL, enhancing system performance.
  • • Created a paginated project listing API, significantly improving scalability for user access.
  • • Enhanced leave management features with dynamic filters and accrual tracking, streamlining user experience.
L

Software Engineer Intern

Lumberfi · Feb 2025 – Aug 2025

Not yet confirmed
  • Architected the Leave History API with full audit-trail schema and optimized data retrieval via Hibernate ORM and native SQL - reducing query execution time by 65% and improving system observability.
  • Engineered transactional bulk-assignment modules processing 1,000+ records with rigorous input validation and OO design - improving data processing throughput by 60% at production scale.
LESS PAY

Full-stack Developer

LESS PAY · Feb 2024 – May 2024

Not yet confirmed
  • Developed a public API to retrieve merchant details by ID, optimizing backend processes with Express.js.
  • Improved user experience and functionality of LessPay.co.in by contributing to the About and Contact pages.
G

Software Intern

Gastos Private Limited · Feb 2024 – May 2024

Not yet confirmed
  • Developed and launched a merchant discovery REST API in Node.js / Express.js - reducing data retrieval latency by 30% and contributing to system documentation and integration testing on delivery.
  • Built modular, reusable React.js UI components with Context API and custom hooks, applying software design principles to reduce coupling and improve testability across the front-end product.

Skills 0 proven through work

Also works with

Assignment System DevelopmentTime Tracking Module DevelopmentCustomer Relationship BuildingStakeholder Communication AdaptationTime ManagementModular System DesignNotification System DevelopmentOn-time DeliveryWork Planning and PrioritizationLocation-Based Feature DevelopmentUI Performance OptimizationNode.js DevelopmentReact DevelopmentHibernate ORM UsageSpring Data JPATechnical Solution DesignAPI Performance OptimizationDatabase Query OptimizationTeamworkProblem SolvingAdaptabilityCode ReviewRequirements AnalysisService Layer Architecture DesignREST API Endpoint DevelopmentData ModelingData Architecture DesignFilter and Search UI ImplementationWorkflow Engine DevelopmentPostgreSQL Database UsageJava DevelopmentSpring BootBackend DevelopmentSoftware Development Practices

Proof of Work

Proof of Work

Sumit shares this with people who ask. You'll hear back either way.

Education

Bachelor of Technology, Computer Science

Indian Institute of Information Technology, Vadodara · 2021 — 2025

Contact details

Contact details

Sumit shares this with people who ask. You'll hear back either way.

Ask about this candidate

AI responses may contain errors. Proof status and source information are provided by Proof of Skill.

A Proof CV — one profile, kept current, with the proof attached. Back to the portal