Viacheslav V.

Need a Java backend that stays reliable under real production load? I design and modernize Spring Boot/AWS systems, microservices, and event-driven architectures. 13+ years across healthcare, logistics, automotive, and high-volume SaaS. I help companies when they need to: • design a scalable Java/Spring Boot backend from scratch • split or modernize a legacy monolith • build event-driven systems with Kafka/SQS • solve performance and database bottlenecks • migrate workloads to AWS • stabilize an existing production system • make architecture decisions before an expensive rewrite Relevant production experience High-volume SaaS: built core backend services that supporting millions of marketing messages. Real-time systems: worked on the backend behind the IndyCar racing application and live telemetry. Healthcare: developed a cloud ECG diagnostics platform used in real clinical workflows in the US. AWS / Logistics: built serverless services for real-time delivery tracking using AWS. Automotive: worked on navigation-data processing software for automotive infotainment systems. Core stack: Java 8–21, Spring Boot, Spring Framework, PostgreSQL, Kafka, AWS, Docker, Cassandra, Elasticsearch, Redis, CI/CD. I can join an existing engineering team as a senior individual contributor or take ownership of backend architecture and technical decisions. If you already have a Java system and something is slow, unreliable, difficult to scale, or becoming too expensive to maintain, send me a short description of the architecture and the main problem. I can usually identify the first areas worth investigating before we even start the contract.