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Duminda Harshaka

@dumindaharshaka

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Senior Full-Stack Engineer with expertise in scalable applications.

Sri Lanka

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What I'm looking for

I am looking for opportunities that foster innovation, collaboration, and growth in a dynamic environment.

I am a Senior Full-Stack Engineer with over 10 years of experience in building scalable applications using Node.js and React. My journey has taken me through various sectors, including IoT, AgTech, PropTech, and EdTech, where I have honed my skills in cloud-native development and serverless architectures. I pride myself on my ability to lead small teams and deliver MVPs quickly while optimizing cloud costs.

Throughout my career, I have successfully delivered numerous production-grade web applications, leveraging my expertise in AWS and modern development practices. As a Top Rated Plus Freelancer on Upwork, I have maintained a 100% job success rate, earning over $100K while working with diverse clients. My projects include architecting smart irrigation control platforms and developing backend features for property management SaaS solutions, all while ensuring high performance and reliability.

In addition to my technical skills, I am passionate about sharing knowledge with the community, as evidenced by my writing on full-stack development, AI, Blockchain, and Cloud Infrastructure. I am always eager to learn and grow, and I look forward to contributing my skills to innovative projects that make a difference.

Experience

Work history, roles, and key accomplishments

Current

Lead Full-Stack Engineer

Current

Grungard

Oct 2020 - Present (4 years 7 months)

Built and led a team of engineers to develop a smart irrigation control platform for the agriculture sector. Architected and deployed a high-throughput MQTT pipeline capable of processing over 1 million messages daily from field sensors. Optimized infrastructure costs and implemented robust observability and auto-scaling solutions using AWS CloudWatch, CloudFormation, and Cloudflare.

React IoT MQTT AWS Cloudwatch CloudFormation Cloudflare Team Leadership Architecture Design

Current

Freelance Full-Stack Engineer

Current

Upwork & Direct Clients

Jan 2019 - Present (6 years 4 months)

Delivered numerous production-grade web applications leveraging Node.js, React, Firebase, AWS, and TypeScript. Designed and implemented scalable MVP architectures complete with CI/CD pipelines and secure backend APIs.

Node React Firebase AWS TypeScript CI CD API Development Web Applications

Senior Software Engineer

Different

May 2019 - Oct 2020 (1 year 5 months)

Developed key backend features for a property management SaaS platform. Enhanced the stability and performance of Node.js microservices, significantly reducing downtime and increasing system throughput.

Node Microservices SaaS Backend Development Throughput API Development

Technical Consultant

NatureNurture.lk

Jun 2016 - May 2017 (11 months)

Built an open-source platform facilitating seed exchange and plant donations, contributing to community engagement and resource sharing. Leveraged technical skills to develop a functional and accessible online tool for the NGO's mission.

Open Source Platform Development Web Development Community Engagement Version Control

Software Engineer

EIMSKY

May 2017 - May 2019 (2 years)

Delivered full-stack web applications for diverse projects including beer quality monitoring and mobile health setups. Built and led a team of engineers to develop platforms utilizing Node.js, MQTT, and React, and programmed edge devices using Lua.

Node React MQTT IoT Health Tech Full Stack Web Development Team Leadership Lua Web Applications

Software Engineer / Trainee

EIMSKY

Sep 2014 - Apr 2016 (1 year 7 months)

Contributed to the development of automation tools and health sector data reporting systems. Gained foundational full-stack exposure, working with technologies including Node.js, MongoDB, and IoT integrations.

Automation Tools Data Reporting Health Tech Full Stack Node MongoDB