Backend C# Engineer & Team Leader (GV)

Our mission as a company providing IT services is to provide our clients all over the world with the best solutions. We manage to do this by analyzing the needs of our clients and matching them to the skills and aspirations of our employees. Therefore, one of our main motivations is to provide each Employee and Consultant with a satisfying experience. Joining us means being part of a community with diverse personalities. Start your adventure with ALTER SOLUTIONS!

We're looking for a Backend C# Engineer & Tech Leader to support several projects for a European institution, concerning security and border control activities.

Responsibilities

• Gathering and documenting requirements for microservices, designing architectural solutions, preparing documentation, and identifying potential risks and challenges.

• Analyzing the existing monolithic system, defining microservice boundaries, refactoring code for modularization, decoupling components, and documenting the adopted approach.

• Defining API endpoints, implementing required functionalities, aligning response formats, coordinating integration points, and conducting integration testing.

• Assessing current performance to identify bottlenecks, refactoring code for efficiency, scaling microservices, implementing optimization strategies, and conducting performance testing.

• Creating and maintaining comprehensive documentation on architecture, setup, and micro frontend usage, performing code reviews, and providing feedback to ensure continuous quality improvement.

• Working closely with business analysts and architects to clarify and refine business needs.

• Managing and coordinating teams involved in the design, development, and maintenance of microservices-based applications.

• Strong background in developing web-based applications using a microservices architecture and expertise in migrating monolithic applications to microservices.

• Bachelor’s degree in Software Engineering or a related field.

• Strong programming skills in C#.

• At least 5 years of proven professional experience, including designing and developing microservices-based applications for large-scale organizations.

• In-depth understanding of microservices architecture, including orchestration and choreography patterns (SAGA) within a Domain-Driven Design (DDD) approach.

• Ability to develop, implement, and maintain scalable, loosely coupled microservices.

• Experience in building and deploying high-quality APIs (REST/WebSockets) for service communication and external integrations.

• Proficiency in containerization technologies (Docker) and orchestration platforms (Kubernetes).

• Experience working in Agile environments (Scrum), with the ability to collaborate effectively within a team, share knowledge, and mentor colleagues.

• Proficiency in English language (B2+/C1 level) and strong communication skills.

Nice to Have

• Possession of an EU-CONFIDENTIAL (or higher) security clearance.

• Experience in a Senior or Lead Developer role, mentoring junior team members.

• Hands-on experience with Red Hat OpenShift (RHOS).

• Strong understanding of design patterns such as Service Discovery, Circuit Breaker, and API Gateway (preferably KONG).

• Proficiency in implementing event-driven architectures (EDA) using Kafka, along with experience working with asynchronous messaging systems.

• Familiarity with distributed databases and data management strategies (SQL/NoSQL).

• Knowledge of monitoring, logging, and distributed tracing tools (e.g., Prometheus, Grafana, ELK, Jaeger) in combination with a Service Mesh communication layer.

• Expertise in securing applications using token-based authentication mechanisms (JWT, OAuth2) and other security measures.

• Experience developing for cloud platforms (Azure, AWS) and their associated toolsets.

• Background in building observability features for microservices.

• Strong understanding of Domain-Driven Design (DDD).

• Experience setting up and maintaining CI/CD pipelines for microservices deployment (Azure Agent, ArgoCD, Helm Charts) and working within a CI/CD environment using Azure DevOps.

• Knowledge of secure coding practices, including OWASP Top 10 security principles.

• Ability to apply best practices, software development patterns, and methodologies (e.g., SOLID principles). Familiarity with UML notation.

• Proficiency in Git workflows.

• Experience writing automated unit and integration tests.

• Work model: Remote/Hybrid from Warsaw;
• Type of contract: B2B;
• Start: ASAP - 1 month;
• Project: 1 year (high possibility of extension;

We offer

• Access to local and international projects - Clients from France, Germany, Portugal, UK, and Benelux.
• Professional development support - trainings, technical certificates, conference participation, foreign language classes, and soft skills trainings are subsidized for up to 2 000 PLN.
• Bonus for recommending Candidates starting from 6 000 up to 10000 PLN.
• Fully paid Medicover healthcare card.
• Psychological support program WellBee.
• Multisport card.
• Regular integration events and gifts.
• Long-term cooperation.
• Relocation Program.

If You applied for this position the Controller of your personal will be  ALTER SOLUTIONS POLSKA Sp. z o.o., with its registered office at Przyokopowa 31, 01-208 Warsaw. The personal data provided by you will be processed for the purpose of the recruitment process and for future recruitment processes. You will have the right too choose one or both options on next page.

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