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Andrii Marchenko
Back-End.NET Developer
.NET Backend Developer with 2.7+ years of commercial experience building SaaS and integration-
heavy systems with ASP.NET Core, PostgreSQL, RabbitMQ, Redis and Docker. Experienced in
designing backend features end-to-end, third-party integrations, observability, security and
performance-sensitive workflows.

Experience

Contact Backend .NET Developer
Green Line Logistics
10/2025 - Present
Phone
[open contact info](look above in the "contact info" section) Worked on Freitty, a multi-tenant logistics SaaS platform spanning three .NET services: a
customer portal (FreightBox.Api), a mobile warehouse admin (MobileApi — built from
scratch), and a legacy Razor admin. Delivered features end-to-end across backend,
Email
integrations, infrastructure, observability, and testing.
[open contact info](look above in the "contact info" section)
Back end: ASP.NET Core (MVC and Minimal/Fast API), EF Core (PostgreSQL),
Mapster, repository pattern; multi-tenant data isolation; full rework of the payment /
Location billing / subscription flow; real-time messenger between projects.
Bratislava Integrations: Stripe, Google Maps (routing + automated data parsing), QuickBooks,
Twilio Lookup, Telegram (Customer Support bot + WTelegramClient), Respond,
SendGrid, FluentEmail, Expo push notifications.

Education Infrastructure & observability: RabbitMQ (MassTransit), Redis, MinIO, Docker, GitHub
CI; Serilog + Loki with custom Grafana dashboards (login / request-rate / security
metrics); brute-force protection, 2FA, suspicious-request tracking; Playwright + xUnit
tests.
2022-2026
.NET Developer (Contract, part-time)
Bachelor of Science in Software Public-safety alerting platform
Engineering 09/2025 - 12/2025
Backend engineer on the dispatch module of a regional emergency-notification platform
Bohdan Khmelnytsky Cherkasy that controls a network of field devices.
Back end: ASP.NET Core, EF Core, PostgreSQL, JWT, Serilog.
National University
Dispatch: PostgreSQL command queue (LISTEN/NOTIFY, FOR UPDATE SKIP
LOCKED), exponential-backoff retries; custom binary UDP protocol with CRC16 and
ACK-tracked delivery.
Language Infrastructure: .NET BackgroundService workers, Docker, GitLab CI.

English - Upper intermediate .NET Developer (Freelance)
Kovalchuk Clinic
Ukrainian - Native
Commissioned directly by a clinician to design and build a custom admin tool for the
clinic. Shaped the initial request into a concrete product concept and delivered the
Game Dev Exp backend solo, plus a few frontend features.
Back end: ASP.NET Core API for the admin panel — doctor's dashboard with patient
report generation and an article publishing funnel; data model designed for future
Led a 4-person team developing a 2D multi-doctor support.
Unity game; project successfully Stack: ASP.NET Core, EF Core, PostgreSQL, Docker.
completed and sold commercially.

Led an 8-person team on a 3D Unity
project with external stakeholders.

.NET Developer (.NET/Vue)
RocketUP
04/2025 - 09/2025
Developed an omnichannel communication platform designed to centralize and automate
client communication for businesses. Implemented core back-end modules, integrations
with social media APIs, and infrastructure improvements that increased system reliability
and usability. Also delivered some Vue + TypeScript (Pinia) features:
Back end: PostgreSQL (EF Core), ASP.NET Core controllers, repositories, complex
queries.
Integrations: Facebook & Instagram APIs (webhooks, sending messages), RabbitMQ
for async processing.
Infrastructure: background jobs (Quartz), structured logging (Serilog), Docker for local
dev, GitLab CI/CD.

Junior Full-Stack Developer (.NET/Vue)
NBomber and NBomber Cloud
01/2024 - 08/2024
Worked on NBomber, a load testing framework: developed plugins, migrated to new
libraries (MQTT, RepoDb, Dapper, Serilog), optimized performance, and expanded
supported systems. Wrote unit tests (xUnit) for new features.
Later contributed to NBomber Cloud, a web interface:
Front end – Vue 3, Pinia (implemented client-side components).
Back end – controllers, services, repositories, task scheduling (Quartz), unit tests.

Links

GitHub LeetCode
https://github.com/mangystx https://leetcode.com/Andrey
Marchenko_x/
LinkedIn
[open contact info](look above in the "contact info" section)