Subhash Vithanapathirana

A mobile app widely consumed by Sysco restaurants to see estimated delivery windows and the complete overview of inbound items in one place. A map view of the Sysco truck's location and follow the route to know precisely when to expect the shipment, as well as online invoices, to see what's coming in the shipment. Restaurants can receive reliable, real-time status updates directly to their mobile device.

• Designed the complete microservices architecture and presented it to the technical stakeholders of Sysco Corporation.
• Led multiple 12-member full-stack engineering teams to successfully deliver the MVP and the complete solution within the timelines while meeting the company's quality expectations.
• Developed back-end components with two junior back-end engineers.
• Conducted thorough code reviews of the back-end team, focusing on the potential functionality breaks, code quality, cognitive complexity, readability, maintainability, and testability.

A workflow pipeline designed in line with a microservices architecture to support Velou's feature extraction process by analyzing images. The system includes components such as a custom-built Chrome Extension to manually collect images from the web efficiently by the data entry team, an automated process to scrape images from a seed websites list, a process to import batches of images uploaded through CSV files, a process to reliably download and save the resized/optimized images on internal storage, a web interface to verify/refine the accuracy of collected images manually by a domain expert, a process to train new versions of image classification ML models using collected images intelligently as training inputs, an API to extract features/predict tags from a given new image, a reporting platform to monitor the workflow, assign jobs to data entry team, etc.

• Designed the complete microservices architecture and presented it to the CTO.
• Developed the end-to-end solution (only full-stack developer) comprising multiple back-end services and web interfaces within a 2-month timeframe to achieve company goals.

A centralized menu management solution over RESTful APIs to be used across the company's product suite, including restaurant discovery, online ordering, and point-of-sales. End-to-end restaurant menu operations were supported, including management of open hours, categories, products, variations, special attributes/add-ons, and tax rates.

• Led a 6-member engineering team to successfully deliver the complete solution within the estimated timeframe.
• Maintained high-quality engineering standards throughout the project with static code analysis and high unit/integration/functional test coverage.
• Initiated the usage of a NoSQL graph database (Neo4j) within the company to suit the use case of efficiently storing highly interconnected restaurant menu-related data.
• Collaborated with other engineering teams that consume the Menu Core as a service to ensure smooth integration and accommodate their feedback.

A microservices-based architecture for the Velou ecosystem to support medium-large scale enterprise customers. NATS message queue is used as the communication middleware, and 20+ microservices are connected to the queue that serves distinct functionality of Velou such as product data acquisition, text analysis, image analysis, search APIs, spell correction, query suggestion generation, deep mode admin, analytics reporting, etc.

• Closely collaborated with the CTO to design the microservices architecture and inter-service communication interfaces.
• Developed 75% of system components using Node.js, Express, and Vue.
• Integrated with leading eCommerce platforms such as Shopify and BigCommerce to sync product catalogs via webhook events.
• Built reusable libraries to be used across multiple services and published as private npm packages.
• Documented the architecture on the company's technical Wikipedia for future reference.

A US-based platform for skilled gaming with the goal to become the operating system for the esports scene providing the infrastructure to play and create cash-prize tournaments and 1v1 matches, stream matches live, and accelerate players' esports careers. The app has grown from a passion project to a global leader in online competitive gaming.

• Built new features and enhanced existing features on a GraphQL API using Node.js and TypeScript, adhering to microservices architecture.
• Worked on 10+ different services that exposed GraphQL subgraphs and unified them to a supergraph using Apollo Federation.
• Followed TDD with high test coverage automated E2E tests.
• Collaborated with the 3-member back-end team to deliver high-quality back-end services to support the development of mobile applications and admin dashboard features.
• Built new back-office management features in the admin dashboard UI using the React and Next.js framework.

A mobile application targeted to help women over 40 years to live healthier and happier through health coaching. The app offers a 12-week weight loss program that focuses on female physiology, including guidance on nutrition, diet, and workout routines.

• Developed the entire back-end based on the Google Firebase platform consisting of REST APIs to power the web onboarding funnel of the healthcare website and successfully met the target initial deployment deadline.
• Proposed a back-end refactor of the existing project; designed and re-implemented the back-end using the Express.js framework and best practices. Created clean code with a strong focus on separating concerns, maintainability, and testability.
• Integrated with third-party APIs such as Suggestic, sticky.io (payment gateway), Intercom, SendGrid, and troubleshoot related issues.
• Collaborated with the leadership team based in the US to discuss the best approaches and timeframe to implement the back-end roadmap, provide feedback on the technical design, and assist in troubleshooting production issues.

An award-winning self-care coaching app that harnesses the power and wisdom of behavioral science to help people develop lasting healthy habits. Users will learn how to create meaningful daily rituals and stack habits to create routines that guide them toward achieving all their health and wellness goals.

• Worked with the 3-member back-end team to deliver high-quality back-end services based on the Google Firebase platform to support the development of mobile application features in short delivery cycles.
• Conducted thorough code reviews of the back-end team, focusing on the potential functionality breaks, code quality, cognitive complexity, readability, maintainability, and testability.
• Enhanced the automated test suite of back-end functionality by writing E2E tests and unit tests to improve coverage and supported the team in manually testing new features and regressions.
• Worked closely with the CTO to elaborate the technical design of new back-end functionalities.
• Developed the front end of the B2B reporting dashboard independently within a month using prior Vue development experience.

An eCommerce website (custom shopping cart solution) for a Florida-based store consisting of a variety of modern furniture such as bedroom furniture, patio furniture, and sofas.

• Developed and maintained eCommerce website back-end and administration console using the LAMP stack including payment gateway integration.
• Worked closely with the CEO based in Miami, FL to translate the customer requirements into technical requirements through effective communication.
• Collaborated with the web design team and assisted them to come up with user-friendly interfaces.
• Conducted training sessions to peers on advanced concepts of PHP and MySQL web development.