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Radovan Toth

@radovantoth

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Senior Full Stack (Java) engineer focused on backend systems, scalability, and modern concurrency.

Slovakia

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What I'm looking for

I seek backend/platform roles where I can architect scalable Java microservices, apply modern concurrency, lead teams, and work in secure, compliance-focused environments with strong CI/CD and observability.

I am a Senior Full Stack Developer with 10+ years of experience building high-performance, secure, and scalable backend systems for fintech, security, and data-intensive domains. I specialize in Java-based microservices, introducing modern concurrency models like Java 21 virtual threads and structured concurrency, and delivering systems that handle tens of thousands of transactions per second with CI/CD, observability, and compliance baked in.

I have architected cloud-agnostic, modular platforms, led GitOps adoption, and mentored cross-functional teams while personally implementing performance-critical services such as fraud evaluators and transaction ledgers. I prioritize Domain-Driven Design, platform-wide observability, secure inter-service communication, and developer experience to produce resilient, compliant systems that meet demanding production SLAs.

Experience

Work history, roles, and key accomplishments

Current

Senior Full Stack Engineer

Current

HSBC

May 2022 - Present (3 years 6 months)

Architected and led development of a modular, high-throughput financial core platform using Java 21 features, reducing payment latency by over 40% and enabling tens of thousands of TPS with GitOps CI/CD and observability.

Java 21+Virtual Threads Spring Boot Microservices AWS GCP GitHub Actions ArgoCD Prometheus

Full Stack Developer

Zabbix

Mar 2018 - May 2022 (4 years 2 months)

Designed and deployed centralized config and secret management, modernized monoliths into Spring Boot microservices, and improved database performance by over 30% while maintaining >90% test coverage and secure CI/CD pipelines.

Spring Boot Docker Jenkins Gitlab CI Spring Security

Backend Developer

Slovnaft

Sep 2015 - Mar 2018 (2 years 6 months)

Built core backend systems for banking and public sector clients, implemented SEPA-compliant payment modules, migrated services to container platforms, and created sandbox environments that cut partner bug reports by ~60%.

Spring MVC Docker OpenShift ISO 20022 REST APIs

Education

Degrees, certifications, and relevant coursework

Comenius University in Bratislava

Bachelor's degree, Computer Science

2011 - 2015

Bachelor's degree completed at Comenius University in Bratislava between 2011 and 2015, providing foundational knowledge relevant to backend and software engineering roles.