Senior Backend Engineer (.NET, Cloud & APIs)

Jobtailor; Madrid; Presencial; EUR 55.000 - 75.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Remote Work

Work-life balance

Referral Bonus

Private Medical Insurance

Continuous Learning

23 vacation days

Descripción de la vacante

Nextlane is looking for a Senior Backend Engineer to build scalable and secure backend services using C# and .NET Core. The engineer will collaborate with cross-functional teams and implement high-quality solutions aligned with architectural standards.

This role requires at least 6 years of backend experience, proficiency in REST APIs, and cloud knowledge (AWS, Azure, GCP). The company offers a remote work option up to three days a week, flexible working hours, and continuous learning opportunities.

Formación

• A minimum of 6 years of experience in backend development.
• Experience developing and maintaining scalable backend services.
• Hands-on experience with GitHub Copilot, Cursor, Claude-Code.

Responsabilidades

• Design, develop, and maintain backend services using C# and .NET Core.
• Build secure, scalable, and high-performance REST APIs.
• Troubleshoot and resolve backend and production issues efficiently.

Conocimientos

C#/.NET

REST APIs design

Cloud platforms (AWS, Azure, GCP)

Agile methodologies

Docker

Descripción del empleo

About Us

At Nextlane, we don’t just develop software solutions – we create the future of the automotive industry.

We are a company that combines advanced technology with a clear vision: simplifying and digitizing every step of the automotive customer journey, empowering manufacturers and dealerships to thrive in a constantly evolving market.

We believe in the value of every team member, offering opportunities for you to develop and contribute to meaningful solutions.

So… What does it mean to be a #Nextlaner?

• Be part of a growth‑oriented culture.
• Collaborate with colleagues from all over the world.
• Believe in the Power of ideas and the diversity of thought.
• Be committed to provide an environment where you can learn, grow, and collaborate on projects that make a global impact.

Our success is measured not just by results, but also by the growth and satisfaction of those who are part of our company.

At Nextlane, you’ll have the opportunity to innovate, push boundaries, and work on solutions that are transforming the automotive world.

We are looking for a Senior Backend Engineer with strong expertise in C#/.NET, cloud‑native backend development, and API engineering.

This is a hands‑on engineering role focused on building scalable, secure, and maintainable backend services in cloud environments. The engineer will work closely with Tech Leads and cross‑functional teams to implement high‑quality solutions aligned with established architectural and engineering standards.

This role is not a Tech Lead or Architect position. The expectation is strong technical execution, active contribution to engineering quality, support for architecture compliance, and ownership of backend deliverables.

AI‑assisted development practices are a core expectation for this role. Candidates should be comfortable using tools such as Cursor, Claude Code Codex, or similar within their daily engineering workflow.

Your Responsibilities

Backend Development

• 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.

Code Quality and Best Practices

• 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, integration, end‑to‑end, and performance/load tests.
• Participate actively in code reviews and engineering quality initiatives.
• Contribute to continuous improvement of development standards, tooling, and workflows.

Collaboration and Agile Development

• Work closely with Tech Leads, frontend engineers, QA engineers, and DevOps engineers.
• Translate technical and business requirements into high‑quality implementations.
• Support architecture compliance and contribute to solution improvement discussions.
• Provide technical guidance and support to less experienced engineers when needed.
• Participate actively in Agile ceremonies and team collaboration activities.

DevOps, Cloud and Architecture

• Work with cloud platforms such as AWS, Azure, or GCP.
• Containerize backend services using Docker.
• Contribute to CI/CD pipelines and automated deployment processes.
• Support observability and monitoring practices using logging, metrics, and tracing tools.
• Follow security, reliability, and operational best practices in backend implementations.

Continuous Improvement

• Stay up to date with advancements in backend technologies.
• Propose and implement improvements in system architecture and development workflows.
• Contribute to knowledge‑sharing initiatives and technical documentation.

What We’re Looking For

Experience

• 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).

Languages

• English (Interview will be conducted in English)

Communication

• Strong communication skills, both verbal and written.

Technical Skills

• 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, and Domain‑Driven Design (DDD)
• Experience with Docker and CI/CD workflows
• Experience working with cloud platforms (AWS, Azure, or GCP)
• Understanding of scalable backend systems, observability, and reliability practices

AI Engineering

• Practical experience using AI coding assistants in day‑to‑day software development (Cursor/Claude Code/Codex/Github Co‑pilot)
• Experience configuring or working with AI‑assisted engineering workflows

Language Skills

• Fluent in English (mandatory).
• French language proficiency is a plus.

Soft Skills

• Strong analytical and problem‑solving abilities.
• Excellent communication and collaboration in cross‑functional teams.
• Ability to take ownership and drive initiatives to completion.

Interpersonal Skills

• Ability to collaborate in a diverse and dynamic environment.

Our Recruitment Process

1. 15‑minute introductory call with our Talent Acquisition Specialist.
2. Interview with the Hiring Team.
3. Technical Interview.

What We Offer

We understand that flexibility and trust are essential for our teams. Here are some of the benefits we offer:

• Remote Work: Up to 3 days a week!
• Work‑life balance: We have flexible entrance and departure time.
• Summer schedule on Fridays: Start early your weekends!
• Referral Bonus: €1500 for every talent you refer (after 6 months).
• Flexible Remuneration: COBEE platform.
• Private Medical Insurance: Adeslas.
• Continuous Learning: Access to our internal platform for continuous development.
• Vacation: 23 vacation days plus an intensive schedule in July and August.
• Teambuilding: Our afterworks and activities are memorable!

Diversity, Inclusion & Belonging

At Nextlane, we are committed to creating a space where everyone feels valued and respected. We firmly believe that diversity in experiences and backgrounds strengthens our culture and drives innovation.

• Support for people with disabilities. If you need any adjustments during the recruitment process, let us know so we can provide the best possible experience.
• Equal opportunities for all: We welcome applications regardless of age, gender, origin, disability, or any other characteristic protected by law.

Join Nextlane and become part of the technological revolution in the automotive industry.

Discover why we are a great place to develop your talent!