Performance Engineering
Re-architected APIs and data pipelines from 3000ms to 700ms responses, and cut mobile app load times by 35%.
Open to senior engineering opportunities
Hi, I'm Kathirgamanathan Kajanan
Senior Software Engineer building scalable, high‑performance digital products.
Full-stack engineer experienced in mobile apps, real-time platforms, cloud systems, event-driven architecture, and user-focused product engineering.
Vavuniya, Sri Lanka
production — snapshot
const engineer = {
role: "Senior Software Engineer",
focus: ["real-time", "full-stack", "mobile", "cloud"],
api_latency: "3000ms → 700ms",
live_updates: "<200ms @ 5,000+ users",
mobile_loads: "35% faster",
prod_bugs: "down 30%",
};
35%
Faster load times
Mobile app performance optimization
3000→700ms
API response time
Backend & pipeline re-architecture
5,000+
Concurrent users
Live updates under 200ms latency
30%
Fewer production bugs
Modular architecture & code quality
Who I am
About
Engineering products end to end, with outcomes you can measure.
I'm a senior full-stack engineer who ships products end to end — from polished mobile front ends to event-driven back ends and the cloud infrastructure underneath them. Over five years at SenzMate IoT Intelligence, I've built physiotherapy and wellness apps, real-time sports platforms, agriculture intelligence systems, and data pipelines that process high-volume event streams.
My work is measured in outcomes: cutting average API response times from 3000ms to 700ms, reducing production bug reports by 30% through modular architecture, and delivering live score updates in under 200ms to more than 5,000 concurrent users. I sweat the details that make software feel fast, reliable, and effortless to use.
Beyond product work, I maintain open-source libraries in the React and React Native ecosystem and keep exploring emerging technologies — the best engineering decisions come from staying curious.
At a glance
- 5+ years building production systems
- Mobile, web, backend & cloud
- Real-time & event-driven architecture
- Open-source maintainer
Scalable Architecture
Event-driven systems on Apache Kafka, Spark, and Elasticsearch, designed to absorb high-volume event streams.
Real-Time Systems
Live score updates delivered in under 200ms to 5,000+ concurrent users over MQTT and WebSocket.
Full-Stack Delivery
React Native and Next.js front ends to Nest.js and Node services on AWS — owned and shipped end to end.
Career
Experience
Five years of shipping production systems at SenzMate IoT Intelligence — from intern to engineer owning full-stack, real-time products.
Software Engineer
SenzMate IoT Intelligence
June 2022 — PresentCurrent
Leading full-stack delivery across mobile, web, and event-driven backend systems.
- Designed and optimized a mobile physiotherapy and wellness application using React Native, Redux, Mediapipe, Node.js, and Express — reducing load times by 35% and increasing daily active users by 20%.
- Built a full-featured car rental platform with React.js and Nest.js, enabling real-time bookings and improving customer retention by 15%.
- Implemented event-driven data pipelines with Apache Kafka, Apache Spark, and Elasticsearch, cutting average API response time from 3000ms to 700ms.
- Raised code quality through modular architecture, reducing production bug reports by 30%.
React NativeReact.jsNest.jsNode.jsKafkaSparkElasticsearchAssociate Software Engineer
SenzMate IoT Intelligence
June 2021 — May 2022
Built real-time IoT and data-intelligence products at production scale.
- Developed and maintained a real-time agriculture intelligence platform using React Native and the MERN stack, helping improve crop yield predictions by 20%.
- Built a sports results tracking system with Next.js, MQTT, and the MENN stack, delivering live score updates with under 200ms latency to 5,000+ concurrent users.
React NativeMERN StackNext.jsMQTTIoTSoftware Engineer Intern
SenzMate IoT Intelligence
Dec 2020 — May 2021
First production experience across the full JavaScript stack.
- Implemented features for a Courses Management System using React, Node.js, MongoDB, and Express.js.
ReactNode.jsMongoDBExpress.js
Selected work
Featured Projects
Production systems built for real users — measured by performance, retention, and scale.
01
Mobile · HealthTech
Physiotherapy & Wellness Mobile App
A mobile wellness and physiotherapy application optimized for performance, usability, and user engagement.
35% faster load times · 20% increase in daily active users
React NativeReduxMediapipeNode.jsExpress
02
Full-Stack Web
Car Rental Platform
A full-featured car rental platform with real-time booking workflows and scalable backend architecture.
Improved customer retention by 15%
React.jsNest.jsReal-time BookingFull-stack
03
Data Engineering
Event-Driven Data Pipeline
A reliable event-driven data pipeline designed to process high-volume event streams with scalability and observability.
API response time reduced from 3000ms to 700ms
Apache KafkaApache SparkElasticsearchScalable Systems
04
Real-Time IoT
Agriculture Intelligence Platform
A real-time agriculture intelligence platform supporting crop yield prediction and farmer decision-making.
Helped improve crop yield predictions by 20%
React NativeMERN StackIoTData Intelligence
05
Real-Time Systems
Sports Results Tracking System
A live sports results platform delivering low-latency score updates at scale.
Under 200ms latency for 5,000+ concurrent users
Next.jsMQTTMENN StackReal-time Systems
06
Full-Stack Web
Courses Management System
A course management platform with core learning-management features and full-stack implementation.
End-to-end LMS features shipped across the stack
ReactNode.jsMongoDBExpress.js
Community code
Open Source
I also contribute to open-source tools focused on React, React Native, and developer productivity.
Toolbox
Skills & Technologies
A full-stack toolkit shaped by production work across mobile, web, backend, and cloud.
Programming Languages
JavaScriptPythonCJava
Mobile
React NativeAndroid Studio
Frontend
React.jsTypeScriptNext.jsBackboneHTMLCSSSASSTailwind CSS
Backend
Node.jsExpress.jsDjangoGraphQLNest.jsWebSocket
Databases
MongoDBMySQLPostgreSQL
Cloud & DevOps
AWS EC2AWS Elastic BeanstalkRoute 53OpenSearchDocker
Architecture & Engineering
SOLID PrinciplesDesign PatternsOOP ConceptsEvent-Driven ArchitectureReal-Time SystemsAPI Optimization
Soft Skills
Problem-SolvingCritical ThinkingTeam CollaborationCustomer Service
Recognition
Awards & Achievements
Competition wins that reflect fast, product-focused engineering under pressure.
Winner · 2022
EngHack 48-Hour Idea Hackathon
Won a national 48-hour hackathon by rapidly prototyping and pitching a product idea end to end.
Winner · 2022
IEEE Innovation Nation Sri Lanka
First place in IEEE's national innovation competition for engineering-driven product thinking.
First Place & Winner · 2016
Yarl Geek Challenge Junior
Took first place in one of Sri Lanka's leading technology challenges for young engineers.
Foundation
Education
Formal computer science education backed by hands-on professional training.
University
BSc (Hons) in Computer Science and Technology
Uva Wellassa University, Sri Lanka
Professional Training
Full-Stack Web Development
UKI Coding School
Advanced Level
G.C.E A/L — Physical Science Stream
Vavuniya Tamil Madhya Maha Vidyalayam
Ordinary Level
G.C.E O/L
Vavuniya Tamil Madhya Maha Vidyalayam
Beyond the job
Leadership & Community
Technical volunteering and community leadership across university, IEEE, and open-source communities.
Alpha Microsoft Learn Student Ambassador
Microsoft
Web Team Lead — Impetus 2023 Competition
Uva Wellassa University
Web Admin
Computer Society
Technical Team Member
FOSS Club
Student Member
IEEE
Member
Computer Society
Get in touch
Let's build something great together
Whether it's a scalable platform, a real-time system, or a mobile product — I'm always open to discussing interesting engineering problems and new opportunities.