Senior .NET Backend Developer – Performance & Data Specialist

Job Summary:

Aviation. It connects our world, brings people together, provides opportunities, accelerates economic growth, and is just so very cool!

Come work for NAVBLUE, a leading services company owned by Airbus, dedicated to Flight Operations, Air Traffic Management solutions and services for airlines, airports, and Air Navigation Service Providers (ANSPs). We combine aircraft manufacturer expertise, flight operations know-how, and agile development to enhance operational efficiency, optimize resources, and increase productivity for a safe and sustainable aviation future. Our global teams deliver a reliable, optimum, and customized user experience to more than 500 customers worldwide.

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.

Navblue 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.

NAVBLUE is operating within the Airbus Helicopters Polska Structure.

About Us:

NAVBLUE, an Airbus Company, is a leading global provider of flight operations solutions, including aeronautical charts, navigation data solutions, flight planning, aircraft performance software (take-off/landing, weight and balance), and crew planning solutions. You’ll be able to shape the future of the digital aviation industry by working on several of the best in the industry flagship products enabling pilots, dispatchers, flight engineers and other aviation personnel on a daily basis to deliver safe, efficient, and reliable flight operations all over the world. You’ll have the opportunity to support millions of flights each year and help NAVBLUE customers maximize efficiency, reduce costs, ensure compliance with complex national and international safety regulations, and effectively deliver their services.

You’ll join a team with a focus on digital and collaborative innovation that is passionate and customer-focused. Over the last few years, Airbus has been supportive of various initiatives such as Going Digital, Performance Based Navigation Services, Air Traffic Management Modernization Programs, FlySmart on iOS and other digital projects related to new aircraft technologies; the launch of NAVBLUE was therefore a natural step to further develop its Flight Operations and Air Traffic Management Portfolio. 

NAVBLUE is a fully owned subsidiary of Services by Airbus, fueled by the agility of Airbus ProSky and Navtech (acquired in 2016), and the pioneering spirit of Airbus, NAVBLUE was created in July 2016 with one mission: lead aviation into the digital age. 

Airbus and all subsidiaries, including NAVBLUE are proud to have been recognized as a Global Top Employer for 2025. Based on eight criteria: physical workplace, work atmosphere and social, health financial and family benefits, vacation and time off, employee communication, performance manager, training and skills development and community involvement. It was determined that we offer some of the most progressive and forward-thinking programs within the area. This achievement reflects our commitment to nurturing and empowering our people to reach their full potential. We’re grateful to our people, whose dedication and collaboration make this possible.

NAVBLUE is based in Addlestone (UK), Cardiff (UK), Toulouse (France), Waterloo, ON (Canada), Bangkok (Thailand) and Gdańsk (Poland) with other offices all around the world. 

The Future is Yours for the Taking:  https://youtu.be/vdY6gYuceYY