Нікіта

NIKITA TATCHUK
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SUMMARY
Java Software Engineer with 3 years of commercial experience across the full backend lifecycle — microservice
architecture, database optimization, messaging systems, and cloud deployment. Known for stabilizing systems under
pressure: restored a near-dead production project, rebuilt a corrupted PostgreSQL schema, and consistently delivered
30–50% performance improvements across multiple roles. Hands-on experience integrating AI APIs (OpenAI, Gemini)
into production workflows. Looking to bring the same ownership mindset to a strong engineering team.
Core Stack: Java Core, Spring Boot, Spring Security, Spring Data, Hibernate, PostgreSQL, MongoDB, Redis, Kafka,
RabbitMQ, Docker, AWS, OpenAI API, Gemini API

SKILLS

Technologies:
- Languages: Java (8, 11, 17, 21)
- Frameworks: Spring Boot, Spring Security, Spring Data JPA, Spring Web (REST)
- Databases: PostgreSQL, MySQL, MongoDB, Redis, Hibernate (ORM)
- AI & Integrations: OpenAI API (GPT Models), Google Gemini API
- Messaging: RabbitMQ, Kafka, ActiveMQ
- Cloud & DevOps: AWS (EC2, S3, RDS, Lambda, IAM, VPC, CloudWatch, ECS), Docker,
Kubernetes, CI/CD
- Tools: Git/GitHub, Maven/Gradle, Swagger/OpenAPI
Computer Science:
- OOP, TDD, DDD, EDA
- Algorithms, data structures
- Monolithic/distributed environments
- Unit/integration testing, automation testing
Languages: English (B2), Ukrainian (Native)

EXPERIENCE
Softica October 2024 – May 2026
Java Software Engineer Remote

• Took full ownership of a fitness platform inherited in a critical failure state, stabilizing the system and recon-
structing a corrupted PostgreSQL schema via Liquibase migrations, reducing the bug rate by 70% and restoring
full production reliability.
• Developed and integrated OpenAI and Gemini APIs into the platform’s content pipeline, automating data
generation workflows and cutting manual processing time by 50%.
• Owned infrastructure and scalability decisions across both projects — introducing Redis caching on AWS EC2
and designing a scaling strategy for high-load endpoints, extending into DevOps-adjacent responsibilities.
• Delivered backend development across 4 microservices for a high-load Facebook-ads CRM platform, implement-
ing asynchronous inter-service communication via RabbitMQ and processing real-time ad campaign and traffic
data streams.
• Optimized critical backend modules, achieving a 40% reduction in query response times for high-traffic, user-
facing endpoints.
WhileTrue January 2024 – September 2024
Java Developer Remote

• Owned business logic development for one of the largest microservices in a hotel-booking platform’s ecosystem,
responsible for core integration with hotel partners.
 • Configured and integrated Apache Kafka as part of the platform’s migration from a micro-monolith to a mi-
croservices architecture, setting up consumer channels to ingest real-time data from dependent services.
• Implemented asynchronous messaging via ActiveMQ to support high-throughput data pipelines, decoupling
critical backend components and improving system resilience.
• Managed data persistence across PostgreSQL and MongoDB, optimizing complex queries through Hibernate/JPA
and targeted indexing — decreasing average query execution time by 30% under high-volume load.
• Integrated OpenAI-based AI tools to extend platform functionality and automate content-related features.
• Containerized microservices with Docker across CI/CD pipelines and increased test coverage from 43% to 80%+
via JUnit and Mockito, improving overall system stability.
ShPlusPlus March 2023 – December 2023
Java Developer Remote

• Designed and built the core backend engine for an EdTech platform, processing, executing, and validating
user-submitted code, delivering a fault-tolerant system capable of reliably evaluating submissions at scale.
• Developed algorithmic validation mechanisms and automated grading logic for logic-based programming chal-
lenges, ensuring accurate and consistent evaluation results.
• Designed and optimized PostgreSQL schemas to efficiently store coding tasks, user solutions, and test execution
results.
• Containerized the application with Docker to ensure environment consistency across development and produc-
tion, eliminating environment-specific deployment issues and reducing deployment time.
• Implemented structured logging and monitoring to proactively identify performance bottlenecks and reduce
mean time to resolution.
• Established a comprehensive JUnit/Mockito test suite covering core execution and validation logic, preventing
regression across releases.

EDUCATION
Bachelor of Computer Science, Odesa Polytechnic National University Expected graduation: 2027