Lasantha D

Freelance Backend & AI Solutions Developer

Upwork • Full-time

Apr 2024 - Present • 2 yrs 1 mo

Currently I am working as a freelance developer delivering scalable backend systems and AI-powered applications for clients, combining traditional enterprise architecture with modern AI capabilities. 1. Designed and developed backend services using Spring Boot and microservices architecture, integrated with AI services where applicable. 2. Built and maintained RESTful APIs to support AI-driven features such as chatbots, document processing, and intelligent automation. 3. Developed LLM-powered applications using OpenAI / Azure OpenAI, including context-aware chatbots and internal AI assistants. 4. Implemented RAG (Retrieval-Augmented Generation) systems to enable AI models to securely query and reason over private client data. 5. Optimized performance using Kafka-based event processing, Redis caching, and efficient data pipelines for AI workloads. 6. Consulted clients on AI adoption, system architecture, and cloud deployment strategies on AWS and Azure. 7. Containerized and deployed AI-enabled services using Docker, ensuring scalability, reliability, and high availability. 8. Ensured solution quality through unit testing, integration testing, and code reviews, following enterprise best practices. 9. This role demonstrates my ability to bridge enterprise software engineering with practical AI solutions that deliver real business value.

Software Engineer

Integro Technologies Pte Ltd, Singapore • Full-time

Apr 2019 - Apr 2024 • 5 yrs

I worked on multiple enterprise banking and financial systems, supporting critical credit, compliance, and recovery workflows used in large-scale production environments. 1. Contributed to the development and enhancement of core banking platforms including Global REACH LOS, CLIMS, ECPS KYC, and D&R systems. 2. Designed and implemented scalable solutions to improve credit processing, loan origination, and recovery operations. 3. Diagnosed and resolved complex technical issues through data analysis, root-cause investigation, and timely implementation of fixes. 4. Maintained detailed technical documentation, including system issue tracking, performance reports, and release notes. 5. Mentored junior developers on Java, Spring, and Hibernate, improving code quality, best practices, and overall team productivity. 6. Proposed product and process improvements based on user feedback, while managing timelines and delivering system enhancements. 7. Led cross-functional collaboration between developers, business analysts, and stakeholders to successfully deliver new features and upgrades.

Software Engineer

PickMe (Digital Mobility Solutions) • Full-time

Jan 2018 - Dec 2018 • 11 mos

I worked as a backend software engineer contributing to large-scale, production systems used in a real-time ride-hailing platform. 1. Developed and maintained RESTful API services for the driver-side application, improving trip matching and directional hire workflows. 2. Refactored existing business logic using SOLID principles, enhancing system maintainability and performance. 3. Implemented asynchronous report generation, reducing processing time and improving system efficiency. 4. Provided Level-2 support for QA-reported issues and performed continuous codebase improvements in a microservices environment. 5. Led GIS data migration using OpenStreetMap APIs, significantly improving route accuracy and location-based services.