I'm Abhishek Kumar

Backend Developer

Backend Developer with ~2 years of experience building scalable microservices and GenAI-powered systems in production. Shipped real-time AI avatar APIs and order/delivery infrastructure serving 100–200 customers daily across GoGiver AI and Speedbae. Strong in Java 21, Spring Boot, Kafka, Redis, LLM integration, and distributed systems design.

View My Work View Resume
Abhishek Kumar

About Me

Backend Developer with ~2 years of experience building scalable microservices and GenAI-powered systems in production. Shipped real-time AI avatar APIs and order/delivery infrastructure serving 100–200 customers daily across GoGiver AI and Speedbae. Strong in Java 21, Spring Boot, Kafka, Redis, LLM integration, and distributed systems design.

~2 Years Experience
15+ REST APIs Built
85%+ Test Coverage
3 Independent Projects

Technical Skills

Java

Java (8, 11, 17, 21), Spring Boot, Spring Security, Spring Data JPA, JPA/Hibernate, REST APIs, Microservices, WebSocket, Kafka

AI / GenAI

OpenAI APIs, LLM Integration, Prompt Engineering, RAG Pipelines, Pydantic-AI

Databases

MySQL, Cassandra, Redis

DevOps & Tools

Docker, Jenkins, CI/CD, Git, Bitbucket, Postman, Swagger/OpenAPI, JIRA, Agile/Scrum

Security

Spring Security, JWT Authentication, RBAC

Testing

JUnit 5, Mockito, Integration Testing, 85%+ Coverage

Familiar

React.js, JavaScript (ES6+), HTML5, CSS3

Experience

Backend Developer

Jan 2025 – Present

GoGiver AI  |  Bangalore

Digital Human Interface (DHI) AI Startup, Bangalore

  • Built backend services for real-time AI avatar interactions across 3 client platforms using Spring Boot and microservices
  • Developed 15+ REST APIs for multi-modal interaction with Swagger/OpenAPI docs, cutting frontend integration time by ~40%
  • Integrated OpenAI LLM APIs into the conversation pipeline — prompt formatting, response parsing, and guardrail validation
  • Built a RAG-based context-passing layer with dynamic prompt chaining, improving response relevance across conversations
  • Implemented a WebSocket-based bidirectional communication module serving 100–200 daily users with heartbeat checks, auto-reconnection, and graceful degradation
  • Added validation, error handling, and rate limiting on core endpoints, sustaining 99.5%+ API uptime
  • Implemented Spring Security (JWT, RBAC); wrote 80+ JUnit/Mockito tests reaching 85%+ coverage

Tech: Java 21, Spring Boot, Spring Security, REST APIs, WebSocket, OpenAI APIs, MySQL, Redis, Docker, Microservices

Backend Developer

Jul 2024 – Jan 2025

Speedbae  |  Jamshedpur

E-commerce Last-Mile Delivery Startup, Jamshedpur

  • Built end-to-end order lifecycle service processing 100–200 daily orders using Spring Boot and microservices
  • Optimized JPA queries and eliminated N+1 issues, cutting order API p95 latency from 800ms to 180ms
  • Built inventory reservation/release service for 5,000+ SKUs with transactional safeguards
  • Developed real-time delivery tracking pipeline on Cassandra, cutting tracking latency from ~40s to ~12s
  • Automated CI/CD with Jenkins, cutting deployment time from 45 min to 12 min

Tech: Java, Spring Boot, JPA/Hibernate, MySQL, Cassandra, REST APIs, WebSocket, Docker, Jenkins

Independent Projects

Personal projects — solo, end-to-end ownership

E-Commerce REST API

Comprehensive REST API for an E-Commerce platform handling end-to-end CRUD operations with robust JWT authentication and session management.

Java Spring Boot MySQL Spring Security
View on GitHub Live Demo

URL Shortener with Real-Time Analytics

Scalable URL shortener with Redis O(1) lookups and Kafka async analytics streaming, rate limiting, and expiry policies.

Java 17 Spring Boot Redis Kafka MySQL Docker
View on GitHub

Cognitive API Agent

AI-powered tool converting natural language into API calls, with a reasoning layer for request validation and user-confirmed execution.

Python Streamlit OpenAI Pydantic-AI
View on GitHub Live Demo

Education & Certifications

B.Tech, Computer Science & Engineering

2020 – 2024

CEC, Jharkhand

  • CGPA: 7.93/10

Certifications

2023 – 2024
  • Java Programming — Intellipaat (2023)
  • Walmart Advanced Software Engineering — Forage (2024)

Get In Touch

Email

iamabhishek2k1@gmail.com

Location

Bangalore, India

Current Role

Backend Developer at GoGiver AI