Kalhara JAKalhara JA · Sales Engineer @ WSO2 · AI for Sales Engineering
the boring parts of engineering.
I'm a Sales Engineer at WSO2, building end-to-end AI-related software engineering tools and workflows for the Sales Engineering team.
§01 · Studio
Studio
Bio · WSO2, ColomboI'm Kalhara Jasin Aarachchi - a Sales Engineer at WSO2, holding a BSc (Hons) in IT from the University of Moratuwa. I work on AI-related internal software engineering projects for the Sales Engineering team, alongside three years of full-stack and AI engineering across web applications and the internal tools companies quietly depend on.
At WSO2, I work on AI-related software engineering within the Sales Engineering team - building end-to-end internal tools and systems that support the team's day-to-day work. Alongside that, I've shipped GenAI services, an AI-matching platform, and 20+ projects for clients across eight countries.
Equally comfortable pairing with a recruiter on where I'd fit on a team, or scoping a project directly with a founder. I write clearly, ship on schedule, and default to boring, durable tools.
I care about production code the way most people care about side projects.
Kalhara JA
Sales Engineer - WSO2
RoleSales Engineer
AtWSO2, since Aug 2026
DisciplinesEngineering · AI
StackJava · Python · TypeScript
EducationBSc (Hons) IT · Univ. of Moratuwa
LanguagesEnglish · Sinhala
FocusAI for Sales Engineering
§02 · Experience
Journey
5 roles · 2023-PresentAug 2026 - Present
Sales Engineer
WSO2
Working on AI-related software engineering projects within the Sales Engineering team at WSO2 - building end-to-end internal tools and automation that support the team's engineering needs.
Current
Aug 2025 - Dec 2025
Software Developer
Richmond Capital Advisors LLC · Miami, FL (Remote)
Part-time - engineered real-estate broker platforms - ticketing systems, transaction management and email-scheduling infrastructure for agent/broker operations.
Part-time
Feb 2025 - Jul 2025
Software Engineer Intern
WSO2
Built GenAI services integrating Azure OpenAI, local LLMs, RAG pipelines and AI agents inside Ballerina Integrator. Shipped Ballerina connectors for HubSpot and Google Drive; deployed scheduled tasks to Choreo.
Full-time
Oct 2023 - Oct 2024
Junior Software Engineer
VaVe · Moratuwa, Sri Lanka
Part-time - developed and maintained production web applications in Agile sprints - React front ends on Spring Boot / Java services.
Part-time
2023 - Present
Independent Software Developer
Remote
Part-time - freelance engineering on Fiverr and Upwork, shipping full-stack builds and quick-turn features for clients worldwide alongside full-time roles.
Part-time
§03 · Selected Work
Selected Work
6 of 25+ · Live & shipped
SHOPLYTICS2026
View case study →
KJA·2026
SHOPLYTICS
Phase-adaptive donor-guided forecasting on the VISUELLE 2.0 SO-fore benchmark
A final-year research project on demand forecasting for new fashion products, combining a phase-adaptive similarity engine with donor-guided LSTM transfer to reach WAPE 90.82 on the official VISUELLE 2.0 benchmark.
- Year
- 2026
- Role
- Researcher, Engineer, and Author
- Stack
- Python · PyTorch · OpenCLIP (ViT-B/32) · ResNet-101 · pandas · NumPy · scikit-learn · statsmodels · Streamlit · FastAPI · pytest
- Duration
- Ongoing
Fit Future Careers 262026
View case study →
KJA·2026
Fit Future Careers 26
End-to-end career fair operations and hiring workflow system
A full-stack monorepo platform that streamlines career fair execution from candidate applications to hiring decisions, including admin operations, recruitment workflows, and public-facing experiences.
- Year
- 2026
- Role
- Lead Full-Stack Developer
- Stack
- Next.js 15 · React · TypeScript · PostgreSQL · Prisma · NextAuth.js · TanStack Query · Zod · React Hook Form · Tailwind CSS · shadcn/ui · pnpm
- Duration
- 3+ Months
VOGUE2026
View case study →
KJA·2026
VOGUE
Production-ready commerce monorepo with a review system and promotion engine
A high-conversion, commercial-grade e-commerce monorepo pairing a customer storefront with an admin dashboard, an integrated review system, and a promotion engine for dynamic marketing.
- Year
- 2026
- Role
- Lead System Architect
- Stack
- Next.js 16 (App Router) · React 19 · Tailwind CSS 4 · Prisma 7 & PostgreSQL · TanStack Query & Table · Turborepo (Commercial Setup) · Cloudinary & AWS S3 · Framer Motion (Premium UX)
- Duration
- 4 Months
AnotherShots2024
View case study →
KJA·2024
AnotherShots
Photography Based Platform
Photography platform simplifying bookings, portfolio management, feed and payments for photographers and clients alike and includes admin dashboard. Mentorship provided by 99x
- Year
- 2024
- Role
- Team Lead
- Stack
- NextJS · NestJS · TypeScript · MongoDB · AWS EC2 · Vercel
- Duration
- 10 Months
CareerGPT2024
View case study →
KJA·2024
CareerGPT
AI-Powered Career Guidance Platform
An AI-powered career guidance platform connecting candidates, recruiters, and career coaches through direct, real-time conversations — replacing mutual-invitation barriers with AI-driven recommendations.
- Year
- 2024
- Role
- Project Lead & Full-Stack Developer
- Stack
- React · TypeScript · Express · PostgreSQL · AWS EC2
- Duration
- 3 Months
Years Out2026
View case study →
KJA·2026
Years Out
Longitudinal platform for real-life decision outcomes
A data-first platform where people share major life decisions and post follow-up updates over time, building a structured, searchable archive of real outcomes instead of one-off anecdotes.
- Year
- 2026
- Role
- Founder & Full-Stack Product Builder
- Stack
- Next.js · TypeScript · React · Prisma · PostgreSQL · NextAuth · Tailwind CSS · TanStack Query · Vercel
- Duration
- Ongoing
§04 · Voices
Voices
7 clients · Verified01
"This is about the best team I’ve worked with on fiverr and I’ve worked with many. I strongly recommend them. They clearly exceeded my expectations and were eager to deliver an excellent product to me."
S
spreaditglobalClient · United Arab Emirates
02
"Amazing and adaptable team that works when you're sleeping. You wake up to PRs that are complete, which is the best feeling!"
A
allanzhengClient · United States
03
"We are working together and I am very happy with the results. Kalhara is very keen to learn and very competent. I will carry on working with him and highly recommend him."
L
luigiclement405Client · Spain
04
"Fast delivery, he is comfortable to work with. Love to work with him again."
O
ogckenClient · Hong Kong
05
"Kalhara has the necessary expertise and more to handle NestJS like a boss, I highly recommend him."
P
programantumClient · Colombia
06
"Kalhara was quick, understood the requirements exceptionally well, and delivered a perfect implementation. Highly recommended!"
P
PathumGClient · Sri Lanka
07
"We were impressed by the technical expertise and dedication shown. The solutions provided were robust, scalable, and perfectly aligned with our business goals."
AE
Alwis Express ManagementClient · Alwis Express
§05 · Numbers
Numbers
Live25+
Projects shipped
15+
Happy clients
4+
Years experience
8+
Countries served
§06 · Blogs
Blogs
Field notes§07 · Services
Services
6 disciplines · Project or retainer01/06
Full-Stack Web Applications
Scalable, high-performance web solutions using Next.js and React. Built for speed, SEO, and seamless user experiences.
EngagementStarting at $500
02/06
AI & Intelligent Agents
Leverage the power of GenAI with custom agents and RAG pipelines to automate workflows and enhance decision-making.
EngagementStarting at $1000
03/06
Machine Learning & Data Engineering
Forecasting models, data pipelines, and applied ML research — taken from prototype to production.
EngagementStarting at $800
04/06
Business Automation
Custom software solutions to automate repetitive tasks, integrate APIs, and optimize daily business operations.
EngagementStarting at $600
05/06
Cloud & DevOps
Secure and scalable infrastructure setup with CI/CD pipelines, ensuring your applications are always reliable and efficient.
EngagementStarting at $400
06/06
Mobile App Development
Cross-platform mobile applications for iOS and Android, delivering native-like performance and user engagement.
EngagementStarting at $800
§08 · Contact
Let's
build something.
Available for freelance and consulting work. If you have a product to ship, or a project touching AI and Sales Engineering - write to me. I read every note personally and reply within 24 hours.
LocationColombo, Sri LankaGMT +5:30