Design for failure
Timeouts, idempotency, observability, and recovery paths belong in the first sketch—not the postmortem.
About
I build dependable systems—and teams that understand them.
Backend engineering is where product promises meet real-world constraints. I enjoy making that boundary reliable, observable, and pleasantly uneventful.
The short version
Engineer, systems thinker, persistent simplifier.
I’m Ishan Tharusha Wijayabahu, a senior backend engineer based in Singapore. I specialise in Java and Spring Boot systems for public-sector, enterprise, and cloud-native platforms.
My work sits across service design, API contracts, data flows, resilience, security, deployment, and observability. I care about the full operating life of software—not only whether it compiles on launch day.
I also enjoy mentoring engineers, documenting architectural decisions, and writing about the practical edges of distributed systems. Good engineering should leave the next person with more clarity than they started with.
Prefer boring clarity
The best architecture is the smallest one that makes ownership, change, and operations obvious.
Measure the outcome
Latency, reliability, delivery speed, and customer impact matter more than the number of tools in the diagram.
Experience
A career built around backend platforms.
From telco and education to public-sector trade systems.
Oct 2024 — Present
Software Engineer · UOB ↗
Building secure banking APIs and Spring Boot microservices with Java 17, Apache Camel, OAuth 2.0, Docker, and high-volume SQL systems. · Singapore
Aug 2023 — Sep 2024
Senior Software Engineer · CrimsonLogic Pte Ltd
Designing secure, observable microservices for public-sector and trade platforms. · Singapore
Jan 2022 — Aug 2023
Software Engineer · Pearson
Built scalable backend services for global education products with a focus on reliability and performance. · Remote
Jun 2021 — Dec 2021
Solutions Developer · John Keells IT
Delivered enterprise integrations with Java, Apache Camel, and Spring Boot. · Sri Lanka
Jun 2019 — Jul 2020
Software Engineer Intern · hSenid Mobile Solutions
Developed telco applications and integrations with mobile-network APIs. · Sri Lanka
Capabilities
Comfortable across the backend lifecycle.
JavaSpring BootMicroservicesREST APIsApache CamelAWSDockerKubernetesRedisSQLCI/CDSecurityPerformanceObservability
Education
Strong foundations, ongoing curiosity.
2017 — 2021
BEng (Hons) Software Engineering · University of Westminster
Software engineering principles, algorithms, system design, and applied research.
2003 — 2016
G.C.E. Advanced Level · Dharmapala College Pannipitiya
Physical Science stream with mathematics and physics.