Lumilens

Senior Software Engineer

Who can apply: US-based role. The employer has not said which states are eligible — confirm before applying.
Location as listed by the employer: “Cracow, Małopolskie, Poland; San Jose; Poland”
Apply on Lumilens's site ↗

Opens the employer's official application page.

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About this role

Lumilens is hiring for a Senior Software Engineer role (full-time). See the official posting for full details.

Requirements

  • 5+ years of C#/.NET — experience with GUI (WPF or similar framework), MVVM, async/await, thread safety, and class library design
  • Strong command of concurrent programming — designing thread-safe systems, avoiding race conditions, and reasoning about execution across multiple threads and processes
  • Experience with .NET 8 or later
  • 3+ years of Python — OOP, pytest, abstraction-driven design
  • Solid understanding of clean architecture — separation of concerns, dependency inversion, dependency injection, and testability
  • MongoDB or similar document database — data modeling, querying, and managing test results at scale
  • Analytical mindset — proven ability to break down complex multi-component failures, trace issues across process boundaries, and design reliable solutions under ambiguity
  • Ability to debug remotely without direct debugger access — diagnosing issues via logs, traces, and telemetry

Summarized from the employer's posting — check the full posting for every requirement.