Sunil Kumar

Software Engineer

Bengaluru, Karnataka, India3 yrs 1 mo experience

Key Highlights

Reduced API response times by 88% through optimization.
Hands-on experience in fintech microservices development.
Strong background in teaching data structures and algorithms.

Stackforce AI infers this person is a Backend Developer specializing in Fintech microservices and performance optimization.

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Skills

Core Skills

JavaMicroservices ArchitectureFrontend DevelopmentTeaching

Other Skills

API OptimizationASP.NET Web APIAlgorithmsAngularBootstrapC (Programming Language)C++CSSCompetetive ProgrammingCompetitive ProgrammingComputer ScienceData StructuresDatabase DesignDatabase Management System (DBMS)Digital Authentication

About

Java Backend Developer with hands-on experience building and scaling production-grade microservices in a fintech environment. Currently working as a Software Engineer I, I have owned backend development for critical services, optimized high-latency APIs (17s → 2s), and handled on-call responsibilities in production systems. Core strengths: • Java, Spring Boot, REST APIs • Microservices architecture • Performance optimization & query tuning • Redis caching & Elasticsearch • MySQL & PostgreSQL • Kibana APM, production debugging I enjoy working on backend systems that demand scalability, reliability, and real-world performance. Actively open to Java Backend / Microservices roles in product-based companies.

Experience

3 yrs 1 mo

Total Experience

2 yrs 2 mos

Average Tenure

11 mos

Current Experience

73 strings

2 roles

Software Engineer I

Jul 2025 – Present · 11 mos · Bengaluru, Karnataka, India · On-site

Owned backend development for mission-critical fintech microservices using Java, Spring Boot, MySQL, PostgreSQL, Redis, and Elasticsearch.
Optimized high-latency APIs, reducing response times from 17 seconds to 2 seconds (~88%) using query optimization, batching, and caching.
Worked extensively on production systems, handling on-call responsibilities and resolving client-blocking issues.
Collaborated closely with monitoring and frontend teams to deliver reliable, scalable backend services.

JavaSpring BootMySQLPostgreSQLRedisElasticsearch+2

SDE INTERN

Aug 2024 – Jul 2025 · 11 mos · Bengaluru, Karnataka, India · On-site

Built Excel add-ins using Angular and Office.js for financial monitoring and analytics.
Developed backend APIs using Java and Spring Boot for monitoring workflows.
Gained hands-on experience with production debugging, performance analysis, and cross-team collaboration.

AngularOffice.jsJavaSpring BootFrontend Development

W3grads

DSA Instructor

May 2024 – Jul 2024 · 2 mos · Mathura, Uttar Pradesh, India · On-site

Designed and delivered interactive Data Structures and Algorithms (DSA) sessions for students, focusing on problem-solving techniques and coding best practices.
Created structured lesson plans, covering topics such as sorting algorithms, dynamic programming, graph theory, and object-oriented programming.
Guided students in competitive programming and coding platforms like CodeForces and LeetCode, improving their problem-solving skills and coding efficiency.

Data StructuresAlgorithmsProblem-solvingTeaching

Glau codechef chapter - codebusters

2 roles

Technical Head

Jul 2023 – Jul 2024 · 1 yr · Mathura, Uttar Pradesh, India

Technical Associate

May 2022 – Jul 2023 · 1 yr 2 mos · Mathura, Uttar Pradesh, India

Encouraging 3000+ students of various branches to learn code by conducting various hands-on workshops, seminars, and competitions to encourage students and improve their skill set.