Senior .NET Platform Engineer - Remote (EU Time Zone)

Luxoft Poland; Wrocław; Remote; PLN 250,000 - 320,000; Full time

Job summary

Luxoft Poland is seeking a senior backend engineer to own and advance critical Kepler subsystems built on .NET and Windows. You will work remotely from within the EU time zone, mentor junior developers, and collaborate with an NYC-based team lead on design and delivery.

Responsibilities include ownership of Kepler subsystems, ensuring reliability, and potentially leading a small EU team while coordinating with a NYC lead.

Qualifications

• 8+ years of commercial software engineering experience, the majority in server‑side .NET development in production environments.
• Hands‑on experience with RabbitMQ or a comparable broker (Kafka, Azure Service Bus). Understands exchanges/queues/bindings or equivalent topology concepts — not just 'I have used a queue'.
• Demonstrable distributed systems depth: has built things that had to be reliable, had to handle message ordering and deduplication, and had consequences when they were wrong.
• Experience with saga‑style or long‑running workflow patterns. Has implemented stateful multi‑step processing where steps arrive out of order, from multiple sources, or with long windows.
• Writes meaningful tests as part of normal development — not as an afterthought. Understands the difference between unit, integration, and contract tests and applies them appropriately.
• Comfortable deploying and running .NET services on Windows Server. Does not require a Linux/container environment to be productive.
• Has led or mentored engineers in some capacity — formal or informal. Can explain their approach to code review, feedback, and developing junior engineers.
• Reads and writes clear technical prose. Can produce a design document, a runbook entry, or a detailed pull request description without prompting.
• Asks the right questions about a new codebase rather than immediately reaching for rewrites. Respects existing design decisions until they understand them.
• Self‑directed and reliable in a remote, asynchronous context. Has done this before and can point to how they managed it.

Responsibilities

• Design and implement backend features across Kepler's .NET/Windows services, MassTransit sagas, and infrastructure layers.
• Take technical ownership of assigned Kepler subsystems: understand their design rationale, identify improvement opportunities, and drive implementation.
• Possibly lead and mentor EU-based developers: code review, pairing, unblocking, and growing their capability over time.
• Collaborate asynchronously with the NYC-based team lead and wider client's team. Reliable written communication across a 5–6 hour time difference is essential.
• Contribute to design discussions, technical documentation, and architecture decisions as a full peer — not a ticket-taker.
• Maintain and improve observability, deployment practices, and platform reliability for the areas they own

Skills

Server-side .NET development

RabbitMQ / Kafka / Azure Service Bus

Distributed systems depth

Saga/long-running workflows

Testing: unit/integration/contract

Windows Server deployment

Mentoring/coaching

Technical writing (design docs/runbook

Remote/asynchronous collaboration

Code review / peer collaboration

Tools

MassTransit

MongoDB

OpenTelemetry

Splunk

YARP/API gateway

Job description

Luxoft Poland is seeking a senior backend engineer to own and advance critical Kepler subsystems built on .NET and Windows. You will work remotely from within the EU time zone, mentor junior developers, and collaborate with an NYC-based team lead on design and delivery.

Responsibilities include ownership of Kepler subsystems, ensuring reliability, and potentially leading a small EU team while coordinating with a NYC lead.