Null Soul
@nullsoul
Software engineer specializing in Node.js and Go microservices with performance focus.
UkraineWhat I'm looking for
I am a forward-thinking software engineer with strong experience building and optimizing Node.js and Go microservices, advocating Clean Architecture and TDD. I focus on measurable performance improvements and reliable APIs.
I have improved service throughput and reduced query latency through profiling, SQL indexing, and backend refactors, and I’ve sped up report generation with Go-based REST APIs.
I champion testing and quality: I introduced Jest and Cypress pipelines, adopted TDD practices, and reduced bug leakage and regression rates across teams. I also standardize architecture to reduce refactor effort and onboarding time.
I enjoy mentoring, producing clear technical documentation, and driving pragmatic tooling and process changes—Docker optimizations, ESLint rules, and reusable npm packages—to increase team productivity and system reliability.
Experience
Work history, roles, and key accomplishments
Middle Node.js Engineer
Self Employed
Nov 2023 - Present (1 year 11 months)
Improved service throughput by 35% using modular NestJS microservices and concurrency tuning; reduced query latency by 40% via SQL schema normalization and backend refactoring. Standardized clean architecture to cut refactor effort 25% and produced documentation to accelerate onboarding.
Middle Node.js Developer
N-iX
Dec 2021 - Nov 2023 (1 year 11 months)
Accelerated report generation by 40% with Go REST APIs and profiling-driven concurrency; reduced production bugs 30% by introducing Jest and Cypress pipelines and modularized services to cut onboarding time 20%.
Junior Node.js Developer
Self Employed
Apr 2021 - Dec 2021 (8 months)
Halved regression bugs by implementing TDD across travel microservices and designed fault-tolerant services with circuit breakers and retries to improve peak-time availability. Delivered an npm package that reduced UI test project setup time by 50%.
Junior PHP/Node.js Developer
RexSoft
Sep 2017 - Apr 2021 (3 years 7 months)
Improved query response time 30% via ORM optimization and indexing and cut production defects 35% by integrating UI automation testing; extended a Python PDF package to reduce generation time 20%.
Education
Degrees, certifications, and relevant coursework
NPNational University Lviv Polytechnic
Bachelor of Science, Software Engineering
Completed a B.Sc. in Software Engineering with coursework and practical experience in software design and backend development.
Khmelnytskyi Polytechnic College
Specialist, Software Engineering
Completed a Specialist qualification in Software Engineering focusing on practical software development skills.
Availability
Location
UkraineAuthorized to work in
Job categories
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