Sumit Kumar
Contact details — on requestProof of Work — on request
Experience
Software Developer
Lumber · Aug 2025 – Present
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Software Engineer
Lumberfi · Aug 2025 – Present
- 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.
Software Developer Internship
Lumber · Feb 2025 – Aug 2025
- • 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.
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Software Engineer Intern
Lumberfi · Feb 2025 – Aug 2025
- 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.
Full-stack Developer
LESS PAY · Feb 2024 – May 2024
- 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.
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Software Intern
Gastos Private Limited · Feb 2024 – May 2024
- 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
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Education
Bachelor of Technology, Computer Science
Indian Institute of Information Technology, Vadodara · 2021 — 2025
Contact details
Contact details
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