Senior Backend Engineer – .NET, Cloud, APIs

Nextlane

Senior Backend Engineer developing scalable services in C#/.NET at Nextlane for the automotive industry. Focused on backend solutions, cloud environments, and collaborating with cross-functional teams.

Posted 6/2/2026full-timeSintra • 🇵🇹 PortugalSeniorWebsite

Tech Stack

Tools & technologies

AWSAzureCloudDockerGoogle Cloud Platform.NETSQL

About the role

Key responsibilities & impact

Design, develop, and maintain backend services using C# and .NET Core.
Build secure, scalable, and high-performance REST APIs.
Implement backend solutions aligned with approved architectural patterns and technical guidelines.
Develop services capable of handling high concurrency and production-scale workloads.
Write optimized and maintainable database queries while ensuring data integrity and performance.
Troubleshoot and resolve backend and production issues efficiently.
Write clean, maintainable, testable, and production-ready code.
Apply SOLID principles and safeguard architectural practices such as Clean Architecture, Onion Architecture, Hexagonal Architecture, and Domain-Driven Design (DDD).
Implement and maintain unit tests, integration tests, end-to-end tests, and performance/load tests.
Participate actively in code reviews and engineering quality initiatives.
Work closely with Tech Leads, frontend engineers, QA engineers, and DevOps engineers.
Translate technical and business requirements into high-quality implementations.
Provide technical guidance and support to less experienced engineers when needed.
Work with cloud platforms such as AWS, Azure, or GCP.
Containerize backend services using Docker.
Contribute to CI/CD pipelines and automated deployment processes.
Stay up to date with advancements in backend technologies and propose improvements.

Requirements

What you’ll need

A minimum of 6 years of experience in backend development.
Experience in developing and maintaining scalable backend services.
Experience writing and maintaining unit, integration and performance tests.
Familiarity with Agile methodologies and DevOps practices.
Hands-on experience with GitHub Copilot, Cursor, Claude-Code… configuration, rule management and use.
Experience working in cloud environments such as Azure, AWS, or Google Cloud Platform (GCP).
Strong proficiency in C# and .NET Core.
Strong experience designing and implementing REST APIs.
Strong SQL and relational database experience.
Good understanding of: SOLID principles, Design patterns, Clean Architecture, Domain-Driven Design (DDD).
Experience with Docker and CI/CD workflows.
Practical experience using AI coding assistants in day-to-day software development (Cursor/Claude Code/Codex/Github Co-pilot).
Fluent in English (mandatory). French language proficiency is a plus.

Benefits

Comp & perks

Hybrid Work: Rotational model, 2 days onsite, three days remote.
Annual Payments: 14 payments per year (12 monthly payments + 1 summer bonus + 1 Christmas bonus in November).
Meal Voucher: €10.20 per working day.
Vacation: 23 vacation days, plus 24th or 31st December off.
Language Training: Access to group classes in Spanish, English, or French.
Private Medical Insurance: Multicare coverage.
Teambuilding: Join us for memorable afterworks and team activities!

ATS Keywords

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Hard Skills & Tools

C#.NET CoreREST APIsSQLDockerunit testingintegration testingperformance testingAgile methodologiesDevOps practices

Soft Skills

technical guidancecommunicationcollaborationproblem-solvingcode review