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Khrystyna D.

@khrystynad4

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5.0
1

3.4

3.4

100%

Backend & System Engineer

$50 USD / Hour

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Poland (5:40 AM)

Joined on January 12, 2026

1 Recommendation

$50 USD / Hour

I build high-performance backend and system-level software in C/C++ and Python, focused on reliability, concurrency, and real-world execution. My background includes modern C/C++, Python, Linux, modular architecture, multithreading, debugging, validation, and performance optimization. I have hands-on experience building and improving simulation workflows, real-time processing components, structured state-exchange logic, and robust backend-style systems where correctness, maintainability, and efficiency matter. I help clients with: • Backend logic and API-driven services • High-performance C/C++ and Python development • System design, refactoring, debugging, and code quality improvement • Concurrent and event-driven application logic • Linux-based software and infrastructure-oriented development • Simulation, analytics, and technical processing engines • AI-supporting systems such as preprocessing pipelines, inference integration, and structured data flows • Automation and internal tools that improve reliability and reduce manual work I am especially interested in backend engineering, system-level software, AI-related engineering, infrastructure-minded development, and technically challenging projects that require strong logic, clean design, and careful debugging. I write maintainable code, isolate problems systematically, and build solutions that are easier to test, extend, and trust.

Verifications

On time

100%

On budget

100%

Accept rate

100%

Repeat hire rate

25%

Portfolio

Portfolio

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5.0 · 1 Review
1 Review
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Robert F.

5.0

$500 USD

2 months ago

MSI Installer for Desktop App

My project that I posted was complex. Khrystyna was the only one who, in her proposal, demonstrated that she had read my project specifications. Very important. Further, her education indicated that she was qualified to do the work. Her work was excellent and on time. Documentation was provided with the code, and we were able to use Telegram to chat back and forth. I strongly recommend Khrystyna as a programmer for your projects and plan to ask her to do future projects for me.

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Experience

System & Backend Engineer

Apr, 2017 - Present

9 years

Independent Software Development

Apr, 2017 - Present

9 years

Designed and implemented backend-oriented software components for structured application workflows, service-side logic, and automation-focused systems. Built maintainable modules for processing, validation, and execution flow, with emphasis on clean architecture, debugging, reliability, and extensibility. Worked on API-oriented integrations and reusable backend logic for stable, scalable, and well-structured software behavior.

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Warsaw, Poland

Apr, 2017 - Present

9 years

Simulation Engineer

Feb, 2024 - Sep, 2025

1 year, 7 months

Bohemia Interactive Simulations

Feb, 2024 - Sep, 2025

1 year, 7 months

Built and improved C++ components for distributed simulation workflows with structured state exchange, synchronization logic, and real-time execution behavior. Focused on backend-style technical logic, debugging, validation, and runtime stability across cooperating modules. Improved maintainability and reliability through modular design, focused testing, and targeted corrections in Linux-based, performance-sensitive environments.

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Williamtown, New South Wales, Australia

Feb, 2024 - Sep, 2025

1 year, 7 months

Robotics & Vision Engineer

Apr, 2020 - Nov, 2023

3 years, 7 months

University Collaboration

Apr, 2020 - Nov, 2023

3 years, 7 months

Developed C++ and OpenCV software for robot-soccer perception, including object detection, localization support, and structured world-state outputs used by higher-level control logic. Improved pipeline responsiveness, readability, maintainability, and result quality through iterative debugging and refinement. Worked with camera-driven processing flows in an applied engineering environment combining software and perception systems.

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Warsaw, Poland

Apr, 2020 - Nov, 2023

3 years, 7 months

Education

Uniwersytet Warszawski

2012 - 2016

4 years

Bachelor's Degree in Computer Software Engineering

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Poland

2012 - 2016

4 years

Certifications

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