Kevin Sebastian

About Kevin Sebastian

I’m a Software Engineer with hands-on production experience building scalable backend systems and cloud-based IoT platforms.Currently at Cronlux Technologies, I work on Java Spring Boot microservices, Apache Kafka event streaming, MQTT-based real-time communication, and AWS cloud infrastructure — powering smart home automation at scale. Key contributions:• Reduced API response time by 45%(180ms → 100ms) using Redis caching, validated under concurrent requests with JMeter• Built and maintained 5+ production microservices for device management, automation workflows, and OAuth2-secured authorization• Enabled Amazon Alexa Smart Home integration (Login with Amazon) used by real-world users• Led end-to-end development and deployment of the Cronlux product website (React · Vite · Vercel)Previously, I gained cross-stack experience as a Frontend Intern at WYND Technologies (fintech) and built a Linux system monitoring tool from scratch in C during my first internship.Beyond engineering, I’ve led student communities as Head of the ISTE CSE Forum — organizing workshops, coding contests, and mentoring programs. I’m also GATE 2025 qualified, reflecting a strong foundation in core computer science concepts. Tech stack:Java · Spring Boot · Python · Kafka · MQTT · Redis · MySQL · PostgreSQL · AWS (EC2, ECS) · Docker · React · Angular I’m currently open to Software Engineering roles (Backend / Cloud / Platform / Full Stack) where I can build scalable systems and solve real-world problems. Let’s connect:[k••••••••@gmail.com](mailto:k••••••••@gmail.com)

Experience

1. Software Engineer

   Cronlux

   May 2025 — Present · Kochi, IN

   Reduced API response time by 45%(180ms → 100ms) by implementing Redis caching for session and device-state management; validated under concurrent requests using Apache JMeter• Built and maintained 5+ Java Spring Boot microservices on AWS (EC2, ECS) powering device management, automation workflows, and scalable REST APIs for a production IoT platform• Engineered MQTT-based real-time messaging for bidirectional device communication and used Apache Kafka as the event streaming backbone for decoupled microservices• Designed and deployed an OAuth2 authentication service enabling secure user and device authorization across platform services• Enabled Amazon Alexa Smart Home integration (Login with Amazon), extending platform capabilities to voice-controlled ecosystems• Developed Python validation scripts in collaboration with firmware teams to ensure firmware–API backward compatibility across releases• Containerized microservices using Docker, standardizing development, testing, and deployment workflows• Led end-to-end development and deployment of the Cronlux product website (React · Vite · Vercel)• Collaborated with engineer backend team within Agile sprints (Jira), contributing to code reviews, sprint planning, and feature delivery

Education

• Chavara Public School

  Class 12

• APJ Abdul Kalam Technological University

  Bachelor of Technology - BTech, Computer Science

  2021 — 2025

• Government Engineering College Wayanad

  Bachelor of Technology

  2021 — 2025