Senior .NET Backend Developer – Performance & Data Specialist

Job Description

Skywise is a leading flight operations specialist, operating as a wholly owned subsidiary of Airbus. We provide comprehensive ground and onboard solutions designed to increase productivity for aircraft operators worldwide. We combine deep industry know-how with an agile development culture to drive innovation in operational efficiency and sustainable aviation.

We’re looking for an experienced Software Developer who is great at building and improving cloud-based apps (SaaS) using microservices. While you will work on the backend team building new features, your primary area of expertise should be database engineering to support multiple teams across the organization.

Key Responsibilities

• Technical Design & Data Integrity: Lead the design of database schemas and data layers, ensuring they are scalable, efficient, and maintainable within a microservices architecture.

• Query Optimization: Analyze and optimize SQL queries, specifically those generated by Entity Framework (EF) Core, to resolve performance bottlenecks (e.g., N+1 issues, Cartesian products).

• Database Management: Design and maintain indexing strategies and data types that optimize performance beyond standard framework defaults.

• Cloud Performance Monitoring: Use tools like AWS Performance Insights to monitor and manage AWS RDS/Aurora performance (CPU, IOPS, and memory usage).

• Technical Leadership: Define best practices for data access patterns and mentor other engineers on writing performant LINQ and raw SQL.

• Software Development: Develop and maintain backend services using C# and .NET in an AWS cloud environment, adhering to high security and quality standards.

Required Skills/Experience: 

• Experience: Minimum 6 years of professional experience in backend software development using .NET and C#.

• Entity Framework Expertise: Advanced knowledge of EF Core, including internal translation of LINQ to SQL and the ability to override it for performance reasons.

• SQL Proficiency: Expert level in Raw SQL and the ability to analyze complex Execution Plans.

• Cloud Data Stores: Proven track record of optimizing cloud-native databases, specifically AWS RDS or Aurora.

• Data Architecture: Experience designing schemas for high-traffic, multi-tenant SaaS applications.

• Infrastructure: Practical experience with Docker, CI/CD pipelines (GitHub Actions, GitLab, or similar), and modern monitoring/logging tools.

Nice-to-Haves:

• Experience writing unit tests, component testing, integration testing, covering both functional and non-functional aspects.

• Experience writing integration tests that specifically validate data layer logic and performance.

• Familiarity with AWS CloudWatch and database-specific monitoring tools.

• Deep expertise in implementation of automated functional tests using Python.

• Broad and in-depth understanding of software testing concepts and methodologies, including unit testing, component testing, and integration testing (covering functional and non-functional aspects). Demonstrable knowledge of ISTQB best practices. ISTQB certification is a strong asset.

• Understanding of ASP .NET MVC and ASP .NET Web pages

• Working knowledge of JavaScript.

• Understanding of complex flight planning data structures.

• Experience working with complex flight planning or aviation data structures.

We offer: 

• Hybrid work environment with up to 2 days working from home weekly

• Stable employment based on a full-time job contract

• International working environment in a dynamic company 

• Access to the latest knowledge and technologies enabling professional development 

• Training and development possibilities 

• Participating in international projects and international trips 

• Competitive salary dependent on experience and qualifications

• Flexible working hours and work-from-home opportunities 

• Private medical coverage for you and your family 

• Sport card 

• Life insurance for you and your family

• Co-funding for meals

• Employee stock ownership plan

Selection and Hiring Commitment 

We thank all applicants for applying. Only selected applicants will be contacted.

Skywise is committed to creating an environment and a culture where everyone feels like they belong no matter who they are or where they are from. We are committed to providing equal employment opportunities to all individuals based on job-related qualifications and ability to perform a job. We do not discriminate against any employee or applicant for employment because of race, colour, sex, age, national or ethnic origin, religion, sexual orientation, gender identity or expression, marital status, family status, genetic characteristics, record of offences, and basis of disability or any protected class. Accommodations will be available on request for candidates throughout the entire recruitment and selection process.

Skywise Gdansk is operating within the Airbus Helicopters Polska Structure. 

At Airbus Helicopters Polska sp. z o.o. Gdańsk Plant, the "Internal procedure for reporting legal violations and taking follow-up actions at Airbus Helicopters Polska sp. z o.o. Gdańsk Plant" is in effect. This procedure was introduced in accordance with the Act of June 14, 2024, on the protection of whistleblowers (Journal of Laws of 2024, item 928). In the event of any detected violations, whistleblowers can submit reports to the following email address: talent@skywise.com.