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ELEKS Logo ELEKS · IT - Software Development

Senior/ Lead Full-Stack (.NET + React) Developer

Poland · Job Posted June 10, 2026
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Job Description

ELEKS Software Engineering and Development Office is looking for a Senior/ Lead Full-Stack (.NET + React) Developer in Poland, Croatia or EU. Our client is one of the largest British-American insurance brokers globally, specializing in risk management, insurance and reinsurance brokerage, and investment banking solutions.

Job Responsibility

  • Design, develop, and maintain reliable software in line with technical requirements
  • Analyze requirements, and independently estimate and set up tasks’ acceptance criteria
  • Evaluate and coordinate tasks’ deadlines with the Technical Leader or Project Manager
  • Apply the best software development practices and coding standards to produce high-quality and performant solutions
  • Stay up-to-date with modern technology and optionally obtain professional certifications
  • Participate as a trainer or a trainee in various learning programs outside the main project

Requirements

  • 4+ years of experience with C#, .NET Core, NET Framework
  • 3+ years of experience with React
  • Experience with Azure native microservices architecture & Azure services (AI search, key vault, AKS, storage queue, Azure Functions, event hub, APIm)
  • Security protocols: OAuth 2.0 (OKTA)
  • Experience with Kubernetes, Dockers
  • Hands-on experience in building RESTful APIs based on API management
  • Good knowledge of CI/CD based on DevOps services, Terraform
  • Hands-on experience in Unit Testing using XUnit / Nunit
  • Minimal API standard knowledge
  • ORMs: EF6
  • Following DDD (Data Driven Design)
  • Understanding the canonical APIs approach
  • Experience with databases (CosmosDB, MS SQL,, etc.)
  • Understanding APMs
  • At least Upper-Intermediate level of English

Nice to have

  • Monitoring (Datadog, etc.)
  • Experience with cloud-native services such as SignalR, Functions
  • Cache technologies (Redis cache, etc.)

What we offer

  • Close cooperation with a customer
  • Challenging tasks
  • Competence development
  • Ability to influence project technologies
  • Team of professionals
  • Dynamic environment with low level of bureaucracy
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