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Buddhika Sandaruwan

@buddhikasandaruwan

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Senior software engineer delivering scalable fintech systems with resilient architectures.

Sri Lanka

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What I'm looking for

I’m looking for a senior role building secure, high-throughput fintech and enterprise systems, where I can lead architecture, optimize performance, and mentor teams in agile delivery environments.

I’m a Senior Software Engineer with 8+ years delivering scalable, resilient software solutions across fintech and enterprise platforms. I specialize in system design, performance optimization, and end-to-end delivery of production-ready applications.

In my recent role at Paymedia(PVT)LTD, I’ve delivered secure payment integrations for banks, optimized transaction processing with caching and query improvements, and led code reviews and architecture enhancements to improve release stability. I translate complex business requirements into technical solutions and focus on continuous improvement in code quality and system reliability.

Previously, I built core payment gateway services and integrated Mastercard, Visa, and NIBBS Interswitch APIs for secure multi-bank processing, strengthening error handling and validation logic to reduce transaction failures. I also enhanced e-commerce POS experiences and contributed full-stack features using Angular, React, Next.js, and MySQL while collaborating in agile teams.

Across my work and projects, I’ve developed cloud-native microservices with Java, Spring Boot, and AWS Lambda, containerized services with Docker and Kubernetes, and exposed secure RESTful APIs for demanding domains. I’m also passionate about emerging technologies—bringing research-driven thinking into products through AI-assisted systems and NLP-based hate speech detection for Sinhala—while mentoring others and driving quality in every release.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Paymedia (Pvt) Ltd

Jun 2025 - Present (1 year 1 month)

Delivered secure payment integrations for banks, supporting high-volume transactions and improving transaction processing performance. Led code reviews and architecture enhancements to improve release stability and translated business requirements into production-ready solutions.

Payment Integration Transaction Processing Caching Query Optimization Code Review System Architecture

Software Engineer

Paymedia (Pvt) Ltd

Apr 2024 - Jun 2025 (1 year 2 months)

Developed core payment gateway services using Java and Spring Boot and integrated Mastercard, Visa, and NIBBS Interswitch APIs for secure multi-bank processing. Improved error handling and validation logic and supported agile sprint delivery.

Java Spring Boot Payment Gateways Visa API Interswitch Integration Error Handling Agile

Software Engineer

Order Chimps (Pvt) Ltd

Jun 2023 - Feb 2024 (8 months)

Enhanced an e-commerce POS system to improve checkout speed and inventory accuracy. Contributed frontend and backend features using Angular, React, Next.js, and MySQL in a team environment.

POS systems Checkout Optimization Inventory Accuracy Angular React Next.js MySQL

Software Engineer

Virtusa Corporation

Oct 2021 - Jun 2023 (1 year 8 months)

Built enterprise applications using Java, Spring Boot, Node.js, React, and AWS Lambda. Developed reusable UI components, supported cloud-native architectures, and consistently met Agile sprint goals.

Java Spring Boot Node.Js Development React AWS Lambda Cloud Native Architecture UI Components Agile

Associate Software Engineer

Zincat Technology

Jun 2019 - Sep 2021 (2 years 3 months)

Developed RESTful APIs and Spring Boot backend systems for ERP and IoT platforms. Managed CI/CD pipelines and Linux servers to reduce deployment issues and contributed to automated vending and gaming machine solutions.

REST APIs Spring Boot ERP IoT CI CD Pipelines Linux Automation Vending Machines

Software Developer

Developers - In

Jan 2019 - Jun 2019 (5 months)

Built responsive web applications using Angular, HTML, CSS, and TypeScript and developed reusable UI components to improve UI consistency. Worked in Agile workflows using Git for version control.

Angular HTML CSS TypeScript Responsive Web Applications UI Components Git Agile