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Sergey Zolotaryov

@sergeyzolotaryov

Java developer with diverse experience in building resilient, production-ready systems. Spring Contributor.

Russian Federation

What I'm looking for

Looking for opportunities for professional growth and a healthy working environment.

Java developer with diverse experience spanning backend and frontend development, microservices and monolithic architectures, modern and legacy technologies. Contributor to Spring.

Experienced with common Java frameworks and libraries, both standard and third-party.

Successfully worked on projects using popular relational database management systems such as Oracle DB and PostgreSQL.

Extensive experience writing unit and component tests with tools like JUnit and Mockito, achieving up to 99% code coverage with JaCoCo.

Proficient in Git. Practical experience with GitLab and GitHab for version control and collaborative development.

Fluent in English, frequently using this skill to review technical documentation and engage with the English-speaking developer community.

Passionate about environmental conservation. Served as a moderator for Recyclemap, a public map of recycling facilities (formerly run by Russian Greenpeace), for 5 years. After joining, organized local volunteers to update outdated data, increasing verified recycling points in our city by 85%.

Eager to take the next step and further share my expertise and knowledge.

Experience

Work history, roles, and key accomplishments

PA

Java Developer

paytech

Jun 2026 - Jul 2026 (1 month)

Developed a white-label SaaS payment gateway as part of the integrations team.

- Designed a new integration with the Axiron Pay payment provider: payments, payouts, state checks, and webhook handling.

- Introduced Klarna support to the Adyen payment gateway integration.

Java Spring Framework Spring Boot SQL Oracle Maven Git Jenkins Junit Mockito Redis AWS

RL

Software Engineer

Reshenie, LLC

Apr 2024 - Jun 2026 (2 years 2 months)

Developed and maintained the Medical Information System Ariadne (MIS)

- Introduced support for MySQL and MS SQL.

- Resolved memory depletion on 1.2M+ diagnosis records using lazy loading.

- Cut ICD-10 lookup time by 45 times (8.3s to 0.18s).

- Enabled disability period tracking for in-patient care.

Java SQL Spring Framework Spring Boot Oracle PostgreSQL Maven Git TeamCity Jenkins Junit Mockito

AS

Junior Java Developer

Aston

Sep 2023 - Dec 2023 (3 months)

Collaborated on the backend of a banking application with 7 microservices, including as a team lead.

- Transitioned the app from a blocking gateway to a reactive one, increasing the system's throughput.

- Improved maintainability, reliability, and performance by proposing and overseeing cleanup sprints. The first clean-up spring sped up common SQL queries by orders of magnitude.

Java Microservices API Gateway Team Leadership Spring Framework Spring Boot SQL PostgreSQL Maven Git Gitlab CI Junit Mockito

Education

Degrees, certifications, and relevant coursework

Sergey hasn't added their education

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Tech stack

Software and tools used professionally

GitHub

GitLab

JaCoCo

DB

MySQL

PostgreSQL

Spring Framework

Apache Maven

Java

Hibernate

JUnit

Mockito

Git

Docker

SQL

Availability

Looking for a job

Location

Russian Federation

Authorized to work in

Russian Federation

Portfolio

github.com/NadChel

Salary expectations

30k-100k USD

Social media

Job categories

Back End Developer

Skills

Java Hibernate SQL Git Spring Boot Spring MVC Spring Data Spring Security Spring Cloud Maven Spring Framework Russian

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