Junior C# Backend Engineer (Microservices)

Profile

Arseniy Serzhan

C# Backend Engineer

*************@*****.*** LinkedIn GitHub

Junior Backend Engineer experienced in monolithic applications and microservices with C#, ASP.NET Core, PostgreSQL, Kubernetes, RabbitMQ, Kafka, and ClickHouse. Passionate about writing efficient, clean, and maintainable code. Optimized database transactions and service-to-database interactions to improve application performance and reduce database load. Built and maintained monitoring and observability solutions using Grafana, Loki, Prometheus, and Grafana Alloy. Configured Nginx as a reverse proxy and web server on Linux, containerized applications with Docker and Docker Compose, created Docker images, and managed application containers. Designed unit tests to improve code quality and reliability and worked with GitLab CI/CD pipelines in Agile / Scrum workflows. English: B1 — comfortable reading technical documentation, communicating with the team, and explaining technical ideas. Nothing is impossible — it just needs some time. Work Experience

Software Engineer — BMW Academy (Official BMW Dealer) July 2026 – Present Remote

• Develop and maintain backend services in C# and ASP.NET Core in a microservice-based environment, implementing REST APIs, business logic, integrations, and service-to-service communication.

• Use RabbitMQ for asynchronous communication between services and reliable background processing.

• Increased application throughput by approximately 40% by adding database indexes and replacing inefficient ORM-generated queries with optimized raw SQL.

• Designed and deployed company services on Proxmox VE across 4 production virtual machines; configured Nginx reverse proxy, split- horizon DNS, service domains, and TLS certificate issuance and renewal via ACME/Certbot.

• Containerize and operate services with Docker Compose on Debian/Ubuntu Linux, including networking, persistent storage, dependencies, deployment configuration, and troubleshooting.

• Built monitoring, centralized logging, dashboards, and alerting with Prometheus, Grafana, Loki, Grafana Alloy, and Alertmanager for operational troubleshooting.

Tech Stack: C#, ASP.NET Core, REST APIs, PostgreSQL, RabbitMQ, Linux, Docker, Docker Compose, Nginx, Proxmox VE, Prometheus, Grafana, Loki, Grafana Alloy, Alertmanager, DNS, ACME/Certbot, Git, React.js

.NET Developer — Pras Company

July 2025 – July 2026 Hybrid Warsaw, Poland

• Developed backend functionality for a production monolithic application using C# and ASP.NET Core, including business logic, data processing, validation, REST API endpoints, and frontend integration.

• Eliminated N+1 query issues using eager loading (Include/ThenInclude) in Entity Framework Core and implemented optimized raw SQL

(FromSqlRaw) for complex financial reports, reducing dashboard load time by 30%.

• Designed PostgreSQL schemas and maintained database migrations; automated migration deployment through GitLab CI/CD pipelines across application environments.

• Achieved approximately 90% test coverage for critical modules with xUnit and participated in code reviews and Agile/Scrum development processes.

Project: jDOM / jDOM App — project management service for the construction sector Tech Stack: C#, ASP.NET Core, Entity Framework Core, PostgreSQL, GitLab CI/CD, Docker, xUnit, Angular.js Technical Skills

Primary Backend: C#, .NET / ASP.NET Core, Web API, Entity Framework Core, REST APIs, asynchronous programming, background services, dependency injection

Messaging & Distributed Systems: RabbitMQ, Kafka, microservices, event-driven communication; familiarity with NATS Databases: PostgreSQL, ClickHouse, MSSQL, MySQL; SQL, raw SQL, indexing, query optimization, relational data modeling, transactions Containers & Infrastructure: Docker, Docker Compose, Kubernetes (K8s), Linux (Debian/Ubuntu), Nginx, Proxmox VE, DNS, TLS, ACME/Certbot

Observability: Prometheus, Grafana, Loki, Grafana Alloy, Alertmanager, metrics, logs, dashboards, alerting Testing & Delivery: xUnit, unit testing, GitLab CI/CD, Git, GitHub, GitLab, Postman Engineering: OOP, SOLID, DRY, RESTful architecture, business logic, system integration, performance optimization, troubleshooting, Agile/Scrum

Education

Private Educational Institution “College of Business and Law” 2022 – 2026 Specialization: Software of Information Technologies Qualification: Technician-Programmer Languages

Russian — Native English — B2 / Upper Intermediate

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