Sanjay Kumar

Sanjay Kumar

Senior Software Engineer

Back-end Engineer with strong expertise in scalable architectures, concurrency design, and secure authentication. Proven track record of re-architecting critical systems, optimizing real-time data flow, and building high-throughput task execution frameworks. Skilled in Java, Spring Boot, Docker, MQTT, and modern CI/CD workflows.

Experience

Senior Software Engineer

Vimaan | Jun 2022 - Current | Bengaluru, India

Re-architected Authentication Flow: Designed and implemented SSO (OIDC) authentication. Introduced secure session handling, encrypted PII, and enforced robust access controls to significantly improve platform security.
Dynamic Operator UI Orchestration: Led UI re-architecture to reduce firmware data latency and increase modularity. Enabled flexible state injection, dynamic component rendering, and declarative styling/actions (API, firmware).
Station Concurrency Framework: Designed a per-scan-UUID task orchestration system using station-level thread pools. Ensured strict task ordering and sync-then-async execution with robust thread safety using Java concurrency primitives like Thread, ReentrantLock, Condition, and Semaphore.
API Gateway Ownership: Improved gateway performance with token caching and API throttling. Hardened security using Spring Security and custom headers to prevent web exploits.
WebSocket + MQTT Integration: Developed Angular WebSocket clients for real-time UI updates. Built MQTT lifecycle-managed backend for reliable telemetry communication with firmware.
CI/CD & Debugging Enhancements: Automated CI checks for unit tests, linting, and coverage. Utilized Linux tools (e.g., tcpdump, awk, grep) for in-depth microservice and network debugging.

Software Engineering Intern

TomTom | Jun 2021 - Aug 2021 | Remote

Researched map quality using SWOT analysis across Google Maps, OSM, and TomTom.
Implemented user interaction tracking in Angular-based reporting dashboard.

Projects

Sample Project 1: Awesome Utility Suite

Description: A collection of command-line tools to automate common development tasks, built with Python. Features include file processing, code generation, and environment management.

Technologies used: Python, Click, Docker

Link to Repository (GitHub) | Link to Live Demo (if applicable)

Sample Project 2: Personal Portfolio Website V1

Description: My previous personal website (now archived!), built to learn the fundamentals of web development. Focused on clean HTML, CSS, and basic JavaScript.

Technologies used: HTML, CSS, JavaScript

Link to Repository (GitHub)

Sample Project 3: IoT Data Logger

Description: A Raspberry Pi-based sensor data logger that collects environmental data and sends it to a cloud platform for visualization. Explored MQTT for data transmission.

Technologies used: Python, Raspberry Pi, MQTT, InfluxDB

Link to Repository (GitHub)

Skills

Java: Java Concurrency, Multithreading

Spring Boot, Spring Web Security

WebSocket, MQTT

OIDC, OAuth 2.0

Python3, Bash Scripting

Docker, Docker-compose

Nginx

CI/CD Pipelines (e.g., Jenkins, GitLab CI)

Unit Testing & TDD

Agile Methodologies

System Design & Architecture

Microservices

Linux & Command-line Tools (grep, awk, tcpdump)

Experience

Senior Software Engineer

Software Engineering Intern

Projects

Sample Project 1: Awesome Utility Suite

Sample Project 2: Personal Portfolio Website V1

Sample Project 3: IoT Data Logger

Skills

Education

Bachelor of Technology: Computer Science And Engineering

Senior Secondary

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