Vitalii

Vitalii Nikolenko EXPERIENCE

.NET Developer Career break 09/2025 – Present
Upskilling and a personal distributed-systems project (see
[відкрити контакти](див. вище в блоці «контактна інформація») Projects), following a planned rest after four years at Brights.
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Middle ASP.NET Developer 04/2021 – 08/2025
Izmail, Odesa region, Ukraine Brights Kyiv (Remote)
1992 Overview: Multi-project backend development on ASP.NET Core
(up to .NET 8): MVC applications and RESTful APIs for SPAs and
github.com/nikoltech
third-party integrations.
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Core Engineering & Architecture:
vitalii-nikolenko-013697144
Built and migrated backend services from a monolithic .NET
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Framework system to a distributed .NET Core architecture
SUMMARY across 3 business units in a multi-tenant setup (Web API, self-
hosted headless CMS, SPA per unit).
.NET Backend Developer with 4.5 Migrated functionality from the legacy monolith piece by piece,
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years of commercial experience keeping it live and stable while shipping features.
building backend services using Applied Clean Architecture and CQRS to decouple components
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ASP.NET Core and RESTful APIs. and improve testability across projects.
Experienced in system integration
and multi-tenant backend API & Integrations:
solutions. Focused on performance, Optimized a data aggregation service used throughout the
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system reliability, and maintainable project: parallelized external REST API calls and added in-
architecture (Clean Architecture, memory caching with cache-stampede protection, cutting
CQRS). response time from ~10s to <1s.
Currently deepening experience Integrated third-party services such as Zapier, Corezoid and
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with distributed systems in a HubSpot, and implemented REST-based service-to-service
personal project. communication; published events to RabbitMQ on a later project.

Delivery & Security:
EDUCATION Triaged bug-bounty reports from an external security team,
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identified affected backend and infrastructure components,
Specialist resolved backend vulnerabilities, and coordinated remediation.
Odesa Polytechnic University, Delivered features across up to six concurrent projects under
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Institute of Computer Systems peak workload.
2011 – 2016 | Odesa
Software Engineer 2016 – 2017
Qualification: «Computerised
ONPU, Dept. of Innovative Information Odesa
control systems and automatics».
Technologies
PhD program Developed internal desktop applications using C# (WinForms) and
Odesa Polytechnic University maintained web portals.
Stack: .NET Framework, PostgreSQL, HTML, CSS, JavaScript,
09/2017 – 11/2020 | Odesa
jQuery, PHP.
Left to focus on software
development.

LANGUAGES

English: Intermediate (B1)
Ukrainian: native
Russian: Fluent
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CERTIFICATIONS PROJECTS

EF SET (B1) Coworking Platform (Pet)
https://cert.efset.org/en/41tQAb Booking backend system for coworking spaces with time zones,
scheduling rules, concurrency control and distributed messaging
(RabbitMQ, MassTransit).
Additional certificates github.com/nikoltech/Coworking
drive link

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