Sergei User
@sergeiuser2
I build scalable Java microservices, Kafka pipelines, and high-performance PostgreSQL systems.
ArmeniaWhat I'm looking for
I've built backend systems for Monitor Soft, Sberbank, and Glosav using Java, Kotlin, Spring Boot, PostgreSQL, Kafka, Redis, and REST APIs. My work includes scalable microservices, data validation, caching, real-time synchronization, and high-load enterprise data processing.
At Glosav, I designed and implemented a two-component real-time telemetry processing system for industrial sensors, including a Kafka-based pipeline, multithreaded processing, JSON Schema validation, Redis caching, and PostgreSQL storage. At Monitor Soft, I created a custom caching mechanism that reduced database load and built a multithreaded parser for aeronavigation data.
I'm also the sole author of Simple Debugger, an Eclipse IDE plugin for runtime JVM object inspection and debugging that passed Eclipse Foundation review and was accepted on the Eclipse Marketplace.
Experience
Work history, roles, and key accomplishments
Designed and developed an advanced Eclipse IDE plugin for runtime JVM object inspection and debugging using Java Debug Interface (JDI). Successfully passed formal review by the Eclipse Foundation and was officially accepted.
Freelance Backend Engineer
Self Employed
Jan 2024 - Present (2 years 7 months)
Developing and maintaining backend services using Java, Spring Boot, REST APIs and microservices architecture. Designing PostgreSQL database schemas, optimizing queries and implementing performance improvements.
Software Developer (Kotlin)
Sberbank
May 2023 - Sep 2023 (4 months)
Developed backend features and business logic for large-scale enterprise banking systems using Kotlin. Designed and implemented complex PL/pgSQL stored functions and procedures with validation rules.
Junior Java Developer
Glosav
May 2021 - Feb 2023 (1 year 9 months)
Designed and implemented a real-time telemetry processing system for industrial sensors. Built a Kafka-based pipeline with scheduler-driven reader and multi-threaded consumer, storing results in PostgreSQL.
Education
Degrees, certifications, and relevant coursework
GeekBrains
Diploma, Computer Science
Diploma in Java Programming from GeekBrains.
Lomonosov Moscow State University
Master's Degree, General Studies
Master's degree from Lomonosov Moscow State University.
Availability
Location
ArmeniaAuthorized to work in
Job categories
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