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Nextlane

Backend Engineer, .NET, Cloud, APIs

Nextlane

. Design, develop, and maintain backend services using C# and .NET Core .

Posted 9/16/2026full-timeMadrid • SpainMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates strong expertise in backend development using C# and .NET Core, with a focus on building scalable REST APIs and implementing architectural best practices. Proficient in cloud environments such as AWS, Azure, or GCP, and experienced in CI/CD workflows and containerization with Docker.

Highest-signal resume keywords
C#.NET CoreREST API DesignSQLDocker

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Backend DevelopmentUnit TestingIntegration TestingPerformance TestingSOLID PrinciplesClean ArchitectureDomain-Driven Design (DDD)Agile MethodologiesCI/CD WorkflowsObservability
Soft Skills
Analytical AbilitiesProblem-SolvingCommunicationCollaborationOwnership
Tools & Technologies
GitHub CopilotCursorClaude-CodeAWSAzureGoogle Cloud Platform (GCP)Docker
Industry Keywords
Backend ServicesHigh ConcurrencyProduction-Scale WorkloadsTechnical DocumentationEngineering Quality Initiatives

Tech Stack

Tools & technologies
AWSAzureCloudDockerGoogle Cloud PlatformSQL.NET

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
  • Write clean, maintainable, testable, and production-ready code
  • Apply SOLID principles and architectural practices including Clean Architecture, Onion Architecture, Hexagonal Architecture, and DDD
  • Implement and maintain unit, integration, end-to-end, and performance/load tests
  • Participate in code reviews and engineering quality initiatives
  • Contribute to development standards, tooling, workflows, architecture improvements, knowledge sharing, and technical documentation
  • Collaborate with Tech Leads, frontend engineers, QA engineers, and DevOps engineers
  • Translate technical and business requirements into high-quality implementations
  • Support architecture compliance and solution improvement discussions
  • Provide technical guidance to less experienced engineers when needed
  • Participate in Agile ceremonies and team collaboration activities
  • Work with AWS, Azure, or GCP cloud platforms
  • Containerize backend services using Docker
  • Contribute to CI/CD pipelines and automated deployment processes
  • Support observability and monitoring using logging, metrics, and tracing tools
  • Follow security, reliability, and operational best practices
  • Stay current with backend technology advancements and propose workflow improvements

Requirements

What you’ll need
  • A minimum of 6 years of experience in backend development
  • Experience 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, or similar, including configuration, rule management, and use
  • Experience working in cloud environments such as Azure, AWS, or Google Cloud Platform (GCP)
  • English fluency is mandatory; interview conducted in English
  • French language proficiency is a plus
  • Strong proficiency in C# and .NET Core
  • Strong experience designing and implementing REST APIs
  • Strong SQL and relational database experience
  • Understanding of SOLID principles, design patterns, Clean Architecture, and Domain-Driven Design (DDD)
  • Experience with Docker and CI/CD workflows
  • Understanding of scalable backend systems, observability, and reliability practices
  • Practical experience using AI coding assistants in day-to-day software development
  • Experience configuring or working with AI-assisted engineering workflows
  • Strong analytical and problem-solving abilities
  • Excellent communication and collaboration in cross-functional teams
  • Ability to take ownership and drive initiatives to completion
  • Ability to collaborate in a diverse and dynamic environment

Benefits

Comp & perks
  • Remote Work: Up to 3 days a week
  • Flexible entrance and departure time
  • Summer schedule on Fridays
  • 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: afterworks and activities