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Danekerscode User

@danekerscodeuser

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Lead Software Engineer at Adamant Systems who cut database queries 40x by moving a sync service from REST to Kafka.

Kazakhstan

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What I'm looking for

I’m open to remote contract roles.

At Adamant Systems, I lead a team of 5–8 engineers on the Integrated Tax Administration System (ISNA), where I contribute to task decomposition, estimation, code review, and mentoring. I led the migration of more than 20 microservices to Java 21 and reduced database queries from 60K to 1.5K by moving a sync service from REST to Kafka.

I also build and maintain GitLab CI pipelines and work on production monitoring and incident resolution with Prometheus, Grafana, and Kibana. My work has included optimizing SQL on PostgreSQL and Oracle, improving data integrity through a CDC migration, and upgrading Elasticsearch from version 6 to version 8.

Across my software engineering and full-stack roles, I’ve worked on real-time streaming with Kotlin, Kafka, and Flink, as well as healthcare and government services. I’m open to remote contract roles.

Experience

Work history, roles, and key accomplishments

Current

Lead Software Engineer

Current

Adamant Systems

Mar 2025 - Present (1 year 8 months)

- Lead a team of 5-8 engineers on the Integrated Tax Administration System (ISNA): task decomposition, estimation, code review, mentoring
- Led migration of 20+ microservices to Java 21
- Built and maintain GitLab CI pipelines for backend, frontend, database and AI services
- Reduced database queries 40x (60K to 1.5K) by migrating sync service from REST to Kafka
- Migrated CDC mechanism from Debez

Full-stack Developer

РГП на ПХВ "Республиканский центр электронного здравоохранения" МЗ РК

Jul 2024 - Jul 2025 (1 year)

Migrated user session storage from PostgreSQL to Redis, significantly reducing load on the primary database

Integrated Debezium for real-time data change tracking, improving monitoring and synchronization across services

Used Angular to build a user-friendly and intuitive front-end interface

Software Engineer

E-Dariger

Sep 2024 - Jun 2025 (9 months)

Real-time Streaming & Architecture:

Designed and implemented a high-performance data streaming architecture using Kotlin, Apache Kafka, and Apache Flink. Leveraged Kotlin Coroutines and Flow to handle asynchronous data processing pipelines, ensuring non-blocking integration with ClickHouse for real-time analytics.

Communication & Security:

Engineered real-time server-client communication using

Software Engineer

Adamant Systems

Jul 2024 - Mar 2025 (8 months)

• Optimized ElasticSearch search logic and relevance scoring for improved query performance
• Built scalable localization solution for system-wide interface and messaging
• Enhanced advanced search using Spring Events and JPA Criteria API
• Implemented distributed caching with Spring Cache and Hazelcast, reducing database load
• Executed migration of 56M records between databases in 6 hours
• Ensu

Full-stack Developer

РГП на ПХВ "Республиканский центр электронного здравоохранения" МЗ РК

Nov 2023 - Jul 2024 (8 months)

Implemented electronic vaccination consent using OTP; built the client-side application from scratch with Angular

Developed a vaccination calendar feature for the eGov mobile application and set up SMS notifications based on user roles

Java Software Developer

Findum

May 2023 - Oct 2023 (5 months)

Developed microservices using Spring Boot, Spring Cloud, Spring JPA, and PostgreSQL

Built high-load, reliable search engines leveraging ElasticSearch for data storage and Kibana for visualization

Applied testing frameworks such as JUnit, Mockito, and Testcontainers to detect and resolve numerous critical issues

Implemented authentication and authorization mechanisms by integrating Keycloak as t