.NET backend developer in high-load systems

DOU Polska; Warszawa; Hybrid; PLN 210,000 - 330,000; Full time

Job summary

DOU Polska ищет Backend Engineer для работы над ядром индексирования видео и авто-тэгирования спортивных событий. Ваша задача — развивать C#/.NET-бэкэнд и обрабатывать сигналы от алгоритмов для точной маршрутизации событий и временных меток.

Будете участвовать в проектировании, код-ревью и наставничестве, работать в гибридном формате с офисом в Варшаве, и поддерживать связь с командой в Израиле. Требуется 5+ лет опыта и знания Azure и систем обмена сообщениями.

Qualifications

• Опыт разработки на C#/.NET не менее 5 лет.
• Опыт работы в Azure облаке и микросервисной архитектуре.
• Опыт использования сервисов сообщений (Azure Service Bus, Kafka).
• Опыт наставничества и ведения дизайна систем.
• Готовность к гибридной работе, 3 дня в офисе в Варшаве.

Responsibilities

• Разрабатывать и поддерживать backend-инфраструктуру на C#/.NET для индексирования видео и авто-тэгирования.
• Участвовать в проектировании, обзоре кода и наставлять коллег.
• Участвовать в сменах в глобальном on-call-пулу и коммуникациях в Slack.
• Сотрудничать в удалённой распределённой команде и поддерживать высокую доступность систем.

Skills

C#/.NET

Mentoring

Distributed collaboration

Problem solving

New feature development

Tools

Azure

Azure Service Bus

Kafka

SQL databases

Kubernetes

Job description

Описание

As a Backend Engineer at our client, you will contribute directly to the core index layer, processing video indexing based on signals from the algorithm team. Your work will power the auto-tagging engine—the system that splits sports games into distinct events and accurately assigns start and end times to each action. You will balance deep feature development with critical problem-solving in a highly collaborative, AI-integrated environment.

Задачи

Build and maintain the C#/.NET backend infrastructure that interprets algorithm signals to index videos and auto-tag live sports events Elevate the team by actively participating in design discussions, driving code review standards, and mentoring fellow developers Participate in a shared on-call pool (approximately one week every five weeks). While critical nighttime or weekend outages are rare, you must remain reachable and have access to a laptop to respond to operations team escalations Execute tasks independently, demonstrate strong problem-solving skills, and maintain prompt, proactive communication via Slack with the Israel-based team

Требования

Strong proficiency in C# and .NET, with 5+ years of commercial .NET experience Hands-on experience developing within Azure cloud environments Familiarity with and daily use of AI-assisted engineering tools (e.g., Claude, Cursor) Excellent interpersonal skills with a proven ability to mentor peers and lead design discussions High autonomy, independent task execution, and proactive communication habits for effective distributed collaboration Familiarity with event-driven messaging services such as Azure Service Bus or Kafka Working knowledge of SQL databases (general proficiency; specific engines do not matter) Basic familiarity with DevOps terminology and Kubernetes (operational expertise is not required) Willingness to work in a hybrid mode, 3 days from the office in Warsaw

Условия

Direct ownership of pure backend compute at scale—no full-stack dilution, focusing entirely on high-load microservices, indexing engines, and real-time processing High-autonomy environment with modern workflows where AI tools (Claude, Cursor) are embraced to eliminate boilerplate and keep focus on architecture