Sithara Wanigasooriya
@sitharawanigasooriya
Senior software engineer specializing in distributed systems, DevOps, and cloud-native apps.
What I'm looking for
I am a senior software engineer with 5+ years building distributed systems and multi-tenant SaaS platforms, focused on backend performance, reliability, and automation. I have led small engineering teams, delivered high-uptime services, cut API latency, and implemented multi-tenancy and CI/CD practices that improved release cadence and stability.
My hands-on experience spans Spring Boot microservices, Kubernetes, gRPC, event streaming, observability, and AI-assisted automation (OpenAI GPT, Google Document AI). I prioritize scalable architecture, test automation, and secure operations to drive measurable business outcomes such as reduced manual effort, lower latency, and robust disaster recovery.
Experience
Work history, roles, and key accomplishments
Senior Software Engineer
Self Employed
Jul 2024 - Present (1 year 2 months)
Designed Kubernetes-based Spring Boot microservices and gRPC paths to reduce API latency ~40% and implemented AI-assisted invoice parsing to cut manual entry by ~75%, delivering multi-tenant POS & SaaS platforms with 99% uptime.
Associate Technical Team Lead
CodeGen International (Pvt.) Ltd
Jan 2023 - Jun 2024 (1 year 5 months)
Led a 5-engineer product team to achieve ~90% on-time SaaS feature delivery, implemented RBAC with audit trails reducing unauthorized access ~98%, and established a disaster recovery framework cutting downtime ~99% in failover tests.
Senior Software Engineer
CodeGen International (Pvt.) Ltd
Jan 2022 - Dec 2022 (11 months)
Improved cross-service search performance ~60%, implemented CI/CD pipelines that sped releases ~75%, and led security hardening efforts reducing vulnerabilities ~70% while enforcing GDPR-ready logging and PII redaction.
Software Engineer
CodeGen International (Pvt.) Ltd
Feb 2020 - Dec 2021 (1 year 10 months)
Optimized InfluxDB time-series storage to cut storage costs ~80%, built a Workflow Management System with BPMN 2.0 flows, and achieved 80%+ automated test coverage to improve integration reliability.
Software Engineer Intern
GTN Tech (Pvt) Ltd
Jun 2018 - Dec 2018 (6 months)
Supported feature development in Angular and Java EE/Spring environments contributing to frontend and backend modules during internship engagements.
Education
Degrees, certifications, and relevant coursework
Staffordshire University
Master of Science, Computer Science in Business Computing
2022 -
Pursuing an MSc in Computer Science in Business Computing part-time, expected to complete in December 2025.
University of Moratuwa
Bachelor of Science (Engineering) Honours, Computer Science & Engineering
2015 - 2020
Completed a BSc Engineering (Hons.) in Computer Science & Engineering with graduation in January 2020.
Tech stack
Software and tools used professionally
Availability
Location
Authorized to work in
Social media
Job categories
Skills
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