Vitalii

Nikolenko Vitalii EXPERIENCE

.NET Backend Developer Middle ASP.NET Developer
Brights
[open contact info](look above in the "contact info" section)
04/2021 – 08/2025 | Kyiv (Remote)
[open contact info](look above in the "contact info" section) Overview: Multi-project backend development
Odesa region, Izmail focused on building and maintaining ASP.NET Core
MVC applications and RESTful APIs for SPAs and
1992 internal/third-party integrations.
github.com/nikoltech
Core Engineering & Architecture:
[open contact info](look above in the "contact info" section) Migrated and built backend services when moving
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vitalii-nikolenko-013697144 from a monolithic system to a modular .NET Core
architecture across 3 business domains;
integrated Squidex CMS and SPA frontends.
SUMMARY Maintained system stability during migration while
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supporting ongoing development and delivering
.NET Backend Developer with 4.5 years new features.
of experience building backend systems Applied Clean Architecture and CQRS to decouple
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using ASP.NET Core and RESTful APIs. components and improve testability across
Experienced in developing multi-domain multiple projects.
backend solutions. Focused on API & Integrations:
performance, system reliability, and Optimized data aggregation across external REST
maintainable architecture (Clean
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APIs using parallel processing and application-
Architecture, CQRS). level caching with async locking to prevent
Currently deepening experience with redundant external calls under load — reduced
distributed systems through a personal response time from ~10s to under 1s.
project (see Projects). Integrated third-party ecosystems (Zapier,
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Corezoid, HubSpot, etc.) and implemented REST-
based service-to-service communications.
EDUCATION Delivery & Security:
Triaged bug-bounty reports from an external
Specialist
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security team, identified affected backend and
Odesa National Polytechnic infrastructure components, resolved backend
University, Institute of Computer vulnerabilities, and coordinated remediation.
Systems Ensured reliable delivery under peak workload
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2011 – 2016 | Odesa through parallel development streams.
Qualification: «Computerised control
systems and automatics». Software Engineer
ONPU, Odesa; Dept. of Innovative Information
Technologies
LANGUAGES 2015 – 2017 | Odesa
Developed internal desktop applications using C#
English: Intermediate (B1) (WinForms) and maintained web portals.
Ukrainian: native Stack: PHP, PostgreSQL, MySQL, HTML, CSS,
JavaScript, jQuery.
Russian: Fluent

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CERTIFICATIONS PROJECTS

EF_SET (English) Coworking Platform (Pet)
https://cert.efset.org/en/41tQAb Booking backend system for coworking spaces with
time zones, scheduling rules, concurrency control
Additional certificates and distributed messaging (RabbitMQ, MassTransit).
link github.com/nikoltech/Coworking

SOFT SKILLS SKILLS

Analytical problem-solving, delivery- Core
focused mindset, cross-team .NET 6/8/10, ASP.NET Core (Web API, MVC), EF
coordination, multitasking, attention to Core, LINQ, Async Programming, REST APIs, OData,
detail, stress tolerance. Inter-service communication, RabbitMQ,
MassTransit, external integrations (Auth providers,
Squidex CMS, Zapier, HubSpot)

Architecture
Clean Architecture, CQRS (MediatR), DDD, Vertical
slices, SOLID

Data & systems
MS SQL (T-SQL), PostgreSQL, ACID, In-Memory
caching

Background processing
Hangfire, Quartz

Testing & tools
xUnit, FluentValidation, AutoMapper, Seq, Git
(Bitbucket, GitHub), Postman, Docker (Compose,
volumes, healthchecks).
AI-assisted development: Claude Code, GitHub
Copilot.

Familiar with
Redis, AWS S3 / MinIO, GraphQL

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