AI & LLM Systems
Where I spend most of my time retrieval, orchestration, and getting models to production.
- Transformers
- RAG
- Agentic AI
- LangChain
- LangGraph
- Fine-tuning
- Unsloth
- Inference Optimization
- Autoencoders
- LSTMs
kavishka.sysAI / Systems / Security
Open to AI/LLM engineering roles
Kavishka Kalhara
Computer EngineerLLM Systems Engineer, AI Security Researcher, Full-Stack AI Developer
I build secure, production-grade AI systems from RAG pipelines and agentic orchestration to self-healing security architectures that detect, explain, and repair their own failures.
Matara, Sri Lanka
portrait.bmp
Currently
BEng Computer Engineering
University of Ruhuna
Focus
LLM Security
About
I build intelligent, secure and scalable systems.
I'm a Computer Engineering graduate from the University of Ruhuna, with academic requirements completed and convocation in 2027. My focus is building intelligent, secure and scalable systems.
As an Intern Software Engineer at BotCalm Pvt Ltd, I built production LLM applications, RAG pipelines and secure AI backend services. My final-year project, an AI-driven self-healing security framework for IoT, combines anomaly detection, explainable AI and LLM agents for automated threat remediation.
I also have hands-on experience in full-stack development, DevOps and web application security (OWASP Top 10), and I practice ethical hacking as a personal interest.
As Founding President of the Computer Engineering Society (ComES) and Main Organizer of ReXtro 2025, I enjoy leading teams and driving technical initiatives.
6 mo
Production internship
Shipping real AI features
3+
Major systems built
Security, alumni, LLM infra
6+
Leadership roles
Societies, exhibitions, CTFs
2
National competitions
1st Runner-Up · Finalist
Toolkit
The stack I reach for.
Grouped by where it sits in the system from model internals down to the metal it runs on.
Languages
- Python
- TypeScript
- JavaScript
- C / C++
- Java
Backend
- Node.js
- Express.js
- FastAPI
- REST APIs
Cybersecurity
Defensive engineering threat modelling LLM apps before they ship.
- Web Application Security
- OWASP
- LLM Vulnerability Mitigation
DevOps & Cloud
- Docker
- Kubernetes
- AWS EC2
- Nginx
- Linux
- ArgoCD
- Jenkins
Databases
- MongoDB
- PostgreSQL
- SQL
- ChromaDB
Frontend
- React.js
- Tailwind CSS
Security Tooling
- Wireshark
- Nmap
- Kali Linux
Parallel Computing
- CUDA
- OpenMP
- MPI
AI Coding Tools
- Claude Code
- GitHub Copilot
Experience
Where I've shipped.
Production work the kind with users, deadlines, and on-call consequences.
Technical Team Lead and System Administrator
Ruhuna Engineering Faculty Alumni Association (REFAA)
Volunteer
April 2024 — PresentSri Lanka
Built and maintain refaa.lk, the official alumni platform for the Ruhuna Engineering Faculty Alumni Association, serving 1,000+ users.
- Deployed a secure, scalable platform on AWS EC2 with robust authentication, Cloudflare protection and automated CI/CD pipelines using Dokploy.
- Scaled the backend for high-concurrency traffic using Nginx load balancing, Redis distributed caching and Apache Kafka event streaming to keep latency low.
- Integrated PayHere for secure online payments, including membership and event transactions.
- Developed administrative features that streamlined the executive committee's workflows and improved operational efficiency.
- Implemented SEO optimisation to improve search visibility and organic traffic.
Stack
- React.js
- Node.js
- Express.js
- MongoDB
- Redis
- Apache Kafka
- AWS EC2
- Nginx
- Dokploy
- Cloudflare
- PayHere
Intern Software Engineer
BotCalm (Pvt) Ltd
May 2025 — Nov 2025Sri Lanka
Six months building LLM products that had to survive real traffic, real users, and real latency budgets.
- Built production LLM applications on top of RAG pipelines semantic search, prompt orchestration, and vector-based knowledge retrieval serving live use cases.
- Designed the secure AI backend around them: API authentication, async job processing, and model-serving infrastructure that scaled without falling over.
- Wired multi-step reasoning pipelines with n8n and LangChain, connecting external tools into automation flows the team could trigger and trust.
- Pushed retrieval quality up through better embedding strategies, context filtering and prompt refinement then chased the latency back down with GPU performance tuning.
Stack
- Python
- LangChain
- Unsloth
- Hugging Face
- RunPod
- Docker
- n8n
- React
- Tailwind CSS
Education
BSc. Eng. (Hons) Computer Engineering
Faculty of Engineering, University of Ruhuna — graduate
March 2022 – September 2026
Academic requirements completed; convocation in 2027.
G.C.E. Advanced Level & Ordinary Level
Rahula College, Matara
2011 – 2020
Advanced Level (2020)
Physical Science · 2A, 1B
- Combined Mathematics – A
- Chemistry – A
- Physics – B
Ordinary Level
English Medium
- 8 A passes and 1 B pass
- Elective subjects: ICT, Commerce and English Literature
Achievements & Activities
- Gold Medalist – Provincial School Commerce Competition
- Cadet in the St. John's First Aid Unit, trained in first aid and emergency response, and served at school and community events.
Kumarathugu Munidas Maha Vidyalaya
Dickwella
2006 – 2010
Grade 5 Scholarship Examination (2010) – Score: 173
Selected Work
Systems I've designed and shipped.
Three builds that cover the range: applied security research, a production alumni platform, and a construction ERP.
3 projects
View project
2025Research · AI Security
AI-Driven Self-Healing Intelligent System
IoT security that explains itself — and repairs itself.
An IoT security framework that watches network traffic, detects anomalies with sequential ML, explains its reasoning, and lets LLM agents plan and execute the fix.
- Kafka
- FastAPI
- Zeek
- GRU
- SHAP
- Multi-Agent
View project
2025Full-Stack · Production
refaa.lk — Faculty Alumni Platform
A production platform for the Ruhuna Engineering alumni network.
A secure alumni platform with hardened auth, live payments and automated CI/CD — tuned with Nginx load balancing, Redis caching and Kafka events to stay fast under concurrency.
- React
- Node.js
- MongoDB
- Redis
- Kafka
- AWS
View project
Full-Stack · Microservices
Engineering ERP — Full-Stack Microservices Project
Construction operations across web and mobile.
A construction ERP with role-based access, project planning, BOQ estimation, workforce management, site attendance and initial financial accounting.
- Java
- Spring Boot
- PostgreSQL
- React
- React Native/Expo
- Kafka
Recognition
Competitions won, communities built.
Two things I care about equally: solving hard problems under a clock, and leaving structures behind that outlast me.
Achievements
1st Runner-Up
BitCode v5 — Competitive Programming Competition
University of Ruhuna
National Finalist
Robofest 2024 — National Robotics Competition
Sri Lanka
Leadership & volunteering
Founding President
Computer Engineering Society (ComES)
University of Ruhuna
Founded the society from proposal to active chapter.
Main Organizer
ReXtro 2025
National Engineering Exhibition
Co-Chairman
HaXtreme 3.0 & Red Cypher CTF
Capture-the-flag competition
Main Organizer
IEEE Student Branch
University of Ruhuna
Program Lead
CareerXpo 1.0
Careers & industry expo
Program Lead
HaXtreme 2.0
Competitive Programming Competition
Team Lead — Brand Marketing
AIESEC in Ruhuna
Youth leadership organisation
Writing
Notes from the build
I write about LLM systems, retrieval design and the security side of shipping AI — mostly the things I wish someone had written down before I hit them.
Contact
Let's build something that ships.
I'm open to AI/LLM engineering roles, research collaborations, and interesting problems in secure systems. Email me and I'll get back within a day or two.
Open to opportunities · 2026 intake
Reach me directly
- Emailkavishkakalharapro@gmail.com
- PhoneAvailable on request
- LocationMatara, Sri Lanka