Senior Fullstack .NET Engineer (SDLC x AI)

Plain ConceptsRemote — Spain

Remote Full-time

Clicking Apply Now takes you to AutoApply where you can tailor your resume and apply.

Experience Level

Senior

Qualifications

Your Responsibilities Will Include:Designing and leading comprehensive software engineering solutions in cloud environments. Developing projects from inception with minimal oversight and robust team collaboration. Guiding teams to ensure quality delivery. Utilizing AI-assisted development tools like GitHub Copilot, Copilot agents, and Anthropic-based solutions. Selecting the best model and approach for each situation, balancing quality, speed, and cost. Creating and maintaining reusable prompts, instructions, and workflows for standardized AI usage across projects. Advancing modern engineering practices that integrate AI capabilities with strong quality assurance processes. Ensuring adherence to best practices regarding software quality, security, and scalability. Translating business requirements into clear technical specifications following a specification-driven development process. Mentoring fellow engineers to foster technical excellence. Participating in, reviewing, and supporting projects your teammates are involved in. Building scalable pipelines employing various technologies. Staying updated with the latest tools and technologies in the market.

About the job

Plain Concepts is looking for a Senior Fullstack . NET Engineer to join the development team. This remote role is open to candidates based in Spain. The team values skill and collaboration over formal titles, focusing on building tailored solutions that meet client needs.

What You Will Do

Tackle unique software development challenges using best practices and a collaborative approach.
Contribute to projects that use the latest technologies, including AI-assisted development tools, to deliver high-quality solutions efficiently.
Participate in the full software development lifecycle: training, deploying, and implementing new features and systems.
Work in multidisciplinary, AGILE teams that take full ownership of their projects.

Work Environment

Remote-first position within Spain, with the option to work from home or at Plain Concepts offices.
Collaborate with skilled colleagues who value teamwork and innovation.

Key Technologies

. NET
Azure
AI-assisted development tools

About Plain Concepts

At Plain Concepts, we are dedicated to providing innovative solutions that not only meet but exceed our clients' expectations. Our team of experts is passionate about leveraging the latest technologies to create a significant impact. Join us in our mission to drive the future of technology.

Similar jobs

Browse all companies, explore by city & role, or SEO search pages. View directory listings: all jobs, search results, location & role pages.

1 - 20 of 732 Jobs

Search for .NET Developer

732 results

Select all on this page (20)

Apply

Fullstack .NET Developer in Albacete

Sopra Steria

Full-time|On-site|Albacete

Sopra Steria is seeking a Fullstack .NET Developer for its Albacete office. This role centers on designing, building, and maintaining software that meets client requirements. What you will do Design and develop fullstack applications with .NET technologies Maintain and enhance existing software systems Collaborate with team members to deliver solutions tailo…

Apr 23, 2026

Apply

Fullstack .NET Developer (Azure) - Remote

Plain Concepts

Full-time|Remote|Remote — Spain

Plain Concepts is hiring a Fullstack .NET Developer with strong Azure experience. This remote role is open to candidates based in Spain. The team puts collaboration and skill first, so Software Engineers work closely together regardless of title. What you will do Build software solutions for complex projects, starting from the ground up and using modern technologies. Shape system architecture and contribute to technical decisions as part of a collaborative team. Review and support teammates’ work across different projects. Help define and maintain best practices for clean, reusable code. Stay up to date with new tools and developments in software engineering. How the team works Projects follow established best practices and involve experienced colleagues. Teams use AGILE methodologies and encourage full project ownership. Multidisciplinary collaboration is standard, with everyone contributing to impactful projects. Choose to work remotely from home or from a company office.

Apr 23, 2026

Apply

Revit API .NET Developer (Dynamo)

Inetum

Full-time|On-site|Madrid

Join our innovative team at Inetum as a Revit API .NET Developer (Dynamo). We are seeking a passionate developer who is proficient in .NET programming and has experience with the Revit API, specifically utilizing Dynamo for automating workflows and enhancing design processes. This is an exciting opportunity to work on cutting-edge projects in the architectural and engineering sectors.

Jul 2, 2025

Apply

Senior .NET Full Stack Developer

SGS

Full-time|On-site|Madrid

Role overview SGS seeks a Senior .NET Full Stack Developer based in Madrid. This role centers on building and enhancing web applications that drive business objectives. The position requires hands-on work across both front-end and back-end, with a focus on delivering reliable, high-performance solutions throughout the software development lifecycle. What you will do Develop and maintain web applications using .NET and related frameworks Collaborate with cross-functional teams to design and implement solutions that meet business needs Improve application performance and uphold code quality standards Participate in all stages of the software development process, from initial planning through deployment Requirements Extensive experience in both front-end and back-end development Strong collaboration skills with both technical and non-technical colleagues Dedication to maintaining high standards in code quality and application performance

Apr 27, 2026

Apply

Software Developer (.NET) - Entry Level Opportunity

inetum2

Full-time|On-site|Madrid

Join inetum2 as a Software Developer specializing in .NET technologies. This is an exciting opportunity for individuals looking to kickstart their careers in software development. You will work in a dynamic environment, collaborating with experienced professionals to build innovative software solutions.

Sep 5, 2025

Apply

Senior Software Developer - .NET Core / Angular

inetum2

Full-time|On-site|Bilbao

Join our dynamic team at inetum2 as a Senior Software Developer specializing in .NET Core and Angular. In this pivotal role, you will contribute to the development of innovative software solutions and enhance the user experience of our applications. You will work collaboratively with cross-functional teams to design, develop, and deploy high-quality software products.Key responsibilities include analyzing user requirements, coding, debugging, and implementing software enhancements. Your expertise in .NET Core and Angular will be essential in driving our projects to success.

Mar 30, 2026

Apply

Software Developer (.NET C#) at TransPerfect | Barcelona

TransPerfect

Full-time|On-site|Barcelona, Catalunya [Cataluña], Spain

Join our dynamic global team as a Software Engineer responsible for the development, quality assurance, and implementation of our innovative software products.As part of our technology department, you will collaborate with a talented and diverse team located in cities such as Barcelona, New York, London, Manchester, Bucharest, and India. If you're eager to contribute to a thriving company and make a significant impact, we want to hear from you!About TransPerfect – TechOps:The TransPerfect TechOps team has been integral to our success for over a decade, providing technology and services that have simplified the lives of our clients and colleagues. From enhancing workflows for team members to developing core services that underpin our GlobalLink platform, we create scalable client interfaces that empower users to navigate complex ecosystems with ease.

May 4, 2026

Apply

Full Stack Developer (NET/Angular) - Join Our Innovative Team

Sopra Steria

Full-time|On-site|Madrid

We are seeking a talented Full Stack Developer with expertise in .NET and Angular to join our dynamic team at Sopra Steria. In this role, you will work on diverse projects in the Telco, Energy, and Utilities sectors, contributing to innovative solutions that drive our clients' success.As a Full Stack Developer, you will be responsible for designing, developing, and maintaining web applications, collaborating closely with cross-functional teams to deliver high-quality software solutions.

Apr 6, 2026

Apply

Backend Software Engineer (.NET) - Hybrid

neoris

Full-time|Hybrid|Madrid, Spain

neoris is looking for a Backend Software Engineer with a focus on .NET technologies to join the team in Madrid, Spain. This hybrid position involves both in-office and remote work. Role overview This role centers on designing, developing, and maintaining backend systems that support neoris applications. The work involves building reliable services and ensuring performance and scalability. Collaboration Work closely with colleagues from different disciplines to deliver software solutions that align with business objectives. Regular communication with cross-functional teams is part of the job. Location This is a hybrid role based in Madrid, Spain. Some days will be spent in the office, with flexibility for remote work.

Apr 29, 2026

Apply

Software Engineer (C# .NET) at tgs | Madrid

tgs

Full-time|On-site|Madrid, Comunidad de Madrid, Spain

Join our dynamic global team as a Software Engineer, where you will play a crucial role in ensuring the quality, development, and implementation of our innovative software products. As part of a diverse technology department, you will collaborate with talented professionals from cities like Barcelona, New York, London, Manchester, Bucharest, and India. If you're eager to contribute to a growing company and make a significant impact, we would love to hear from you!About TransPerfect – TechOps:The TransPerfect TechOps team has been instrumental in our company's success for over a decade, delivering technology and services that have greatly enhanced the experiences of our clients and colleagues. From improving workflows for team members to developing core services that underpin our GlobalLink platform, we strive to create scalable client interfaces that make complex ecosystems accessible to everyone.

Aug 21, 2025

Apply

Junior Software Engineer (.NET) at tgs | Madrid

tgs

Full-time|On-site|Madrid, Comunidad de Madrid, Spain

Join our innovative team as a Junior Software Engineer focused on backend development in .NET. You will play a crucial role in ensuring the quality, development, and execution of our software products.As part of our dynamic technology department, you'll collaborate with a diverse group of professionals from cities like Barcelona, New York, London, Manchester, Bucharest, and India. If you're eager to make an immediate impact in a growing company, we are excited to hear from you!About TransPerfect – TechOps:The TransPerfect TechOps team has been instrumental in our success for over a decade, delivering cutting-edge technology and services that enhance the workflow for our clients and colleagues. From optimizing our GlobalLink platform to creating user-friendly client interfaces, your contributions will help simplify complex systems for novice users.

Aug 21, 2025

Apply

Senior Backend .NET Software Engineer - Gaming

Betsson Group

Full-time|On-site|Malaga

Are you an accomplished Backend .NET/C# Engineer ready to take the next step in your career? The Gaming Division within Product Development at Betsson Group is currently seeking talented professionals! The Gaming Division focuses on enhancing Game Play and Game Discovery across our diverse brands and markets. Our mission is to provide industry-leading gaming products and an exhilarating user experience on our platforms. We are involved in developing game lobbies, innovative gaming initiatives, and seamless provider integrations. Your Role As a vital member of our team, you will contribute to the development of our Gaming platform, which is at the heart of our operations. This platform underpins all our gaming sites and plays a crucial role in our broader company strategy. You will engage in our transition towards containerization, enhancing the scalability of our systems while ensuring their quality remains top-notch. We continuously reassess our system designs to meet new demands and work on exciting new features. Join our passionate team as we build a scalable, multi-brand platform that supports over 25 online brands, utilized by hundreds of thousands of users worldwide! In essence, you will elevate our Gaming platform to new heights for a global audience!

Feb 18, 2026

Apply

Backend .NET Software Engineer - Gaming

Betsson Group

Full-time|On-site|Malaga

Are you a skilled Backend .NET/C# Engineer seeking an exciting new opportunity? Join the Gaming Area within Product Development at Betsson Group! Our Gaming Area focuses on enhancing Game Play and Game Discovery across all our brands and markets. We are dedicated to delivering the industry's finest gaming products while providing an engaging user experience on our platforms. Our scope includes game lobbies, gaming initiatives, provider integrations, and much more. Your Role You will play a vital role in our core Gaming platform, which supports all our gaming sites and is pivotal to our company strategy. As we embark on our journey towards containerization, you will contribute to scaling our systems while preserving their high quality. We continuously reassess our system design to meet new requirements and work on exciting features. You will collaborate with a passionate team to build a scalable, multi-brand platform supporting over 25 online brands, utilized by hundreds of thousands of users globally. In summary, you will elevate our Gaming platform which serves a worldwide audience! Key Qualifications We are looking for candidates with prior experience as a backend developer and familiarity with the following core technical skills. You should be a collaborative individual who enjoys helping and sharing knowledge with team members. C#, .NET Framework, .NET Core 8 .NET Core Web API SQL Server and NoSQL databases Messaging services within a microservice architecture GitHub and GitFlow Workflow branching strategy Experience in an Agile environment Proficiency in written and spoken English Additionally, experience with RabbitMQ/Kafka, Docker containerization, and Domain Driven Design is a plus. Our Technology Stack At Betsson, we pride ourselves on staying adaptable and current with the latest technologies. Our current tech stack includes: Backend: .NET C#, .NET Core, Specflow .NET Core Web API, .NET Web API AWS, Kubernetes, Docker PostgreSQL, MSSQL, Redis, Couchbase Apache Kafka, RabbitMQ GitHub, TeamCity What We Offer Health Insurance 401k Paid Time Off

Feb 18, 2026

Apply

Full Stack Developer

Septeo

Full-time|On-site|Reus

Join our innovative technical team at Septeo, where artificial intelligence serves as a true co-pilot in development. Your role will encompass:Designing and developing responsive front-end applications with Angular, utilizing tools like Copilot and Gemini to accelerate component creation and enhance quality.Implementing robust back-end solutions using .NET Core and C#, adhering to best practices and generating tests with assistance.Leveraging AI for:Generating unit and integration tests.Refactoring and optimizing performance.Security validation and early bug detection.Integrating and maintaining secure payment gateways.Designing and optimizing databases in SQL Server.Containerization with Docker and deployment on Azure.Participating in CI/CD processes and intelligent automation.Creating functional and technical documentation supported by AI tools.

Feb 27, 2026

Apply

Senior Fullstack .NET Engineer (SDLC x AI)

Plain Concepts

Full-time|Remote|Remote — Spain

Role Overview Plain Concepts is looking for a Senior Fullstack .NET Engineer to join the development team. This remote role is open to candidates based in Spain. The team values skill and collaboration over formal titles, focusing on building tailored solutions that meet client needs. What You Will Do Tackle unique software development challenges using best practices and a collaborative approach. Contribute to projects that use the latest technologies, including AI-assisted development tools, to deliver high-quality solutions efficiently. Participate in the full software development lifecycle: training, deploying, and implementing new features and systems. Work in multidisciplinary, AGILE teams that take full ownership of their projects. Work Environment Remote-first position within Spain, with the option to work from home or at Plain Concepts offices. Collaborate with skilled colleagues who value teamwork and innovation. Key Technologies .NET Azure AI-assisted development tools

Apr 17, 2026

Apply

Senior Backend Developer

SGS

Full-time|On-site|Madrid

Join our dynamic team as a Senior Backend Developer at SGS in Madrid, where you will play a pivotal role in advancing our backend architecture and driving a culture of technical excellence. We are seeking an individual with exceptional technical leadership abilities who can serve as a guiding force for our engineering team. You will have ownership over our backend platform and be instrumental in enhancing code quality and engineering standards.In this role, you will work on a cutting-edge SaaS platform developed on .NET 10, primarily leveraging Azure PaaS. Our work environment is international and English-speaking, fostering collaboration across diverse teams.Key Responsibilities:Design, develop, and enhance scalable, secure, and maintainable backend systems.Lead development initiatives, making impactful architectural and technical decisions.Act as a technical mentor and resource for team members, fostering their growth.Manage the complete software lifecycle— from conceptualization and design to deployment, monitoring, and iterative improvement.Integrate with modern and legacy systems seamlessly.Collaborate with product, frontend, and DevOps teams to create comprehensive end-to-end solutions.Promote engineering excellence by advocating for best practices, including Clean Code and SOLID principles.Architect and deploy distributed systems and event-driven architectures.Construct and refine CI/CD pipelines to facilitate rapid, reliable delivery.Ensure system reliability, performance, and observability in live production environments.Guide and support fellow developers through code reviews, knowledge sharing, and technical mentorship.Contribute to technical documentation, ensuring effective knowledge transfer within the team.

May 4, 2026

Apply

Senior .NET Architect / DevOps Specialist

Inetum

Full-time|On-site|Pamplona

We are seeking a talented individual with a strong technical background who is eager to join a dynamic team dedicated to automation, developer support, and the evolution of technological platforms. This position encompasses a hybrid role focusing on advanced support, platform engineering, and automation development.Your Daily ResponsibilitiesEngage in the enhancement and maintenance of our CI/CD pipelines, developing automations that streamline processes for development teams.Collaborate closely with .NET ecosystem teams, assisting with incidents, debugging, technical decisions, and maintaining proprietary systems.Contribute to the gradual shift towards deploying components in container-based environments, providing technical insights, best practices, and leveraging prior experience.Participate in designing new capabilities related to AI and intelligent automation, an area that our team is eager to expand.Work collaboratively to continuously improve our platforms, tools, and processes.

Feb 17, 2026

Apply

Software Engineer (.NET C#) - Join Our Global Team

TransPerfect

Full-time|On-site|Barcelona, Catalunya [Cataluña], Spain

We are seeking a passionate Software Engineer who will play a crucial role in ensuring the quality, development, and execution of our innovative software products as part of our dynamic global team.You will join a talented technology department consisting of a diverse group of professionals from various locations, including Barcelona, New York, London, Manchester, Bucharest, and India. If you’re eager to make a significant impact in a rapidly growing organization, we want to hear from you!About TransPerfect – TechOps:The TransPerfect TechOps team has been instrumental in the company’s success for over a decade, providing technology and services that have greatly simplified operations for our clients and internal teams. From enhancing workflows to developing core services for our GlobalLink platform, we strive to create scalable client interfaces that enable users to navigate complex ecosystems effortlessly.

Aug 21, 2025

Apply

Desarrollador .NET Core 8 en Devoteam | Madrid

Devoteam

Full-time|On-site|Madrid

Estamos buscando un talentoso Desarrollador .NET Core 8 para unirse a nuestro equipo de desarrollo en Devoteam. En este rol, serás responsable de diseñar, desarrollar y mantener aplicaciones innovadoras utilizando la plataforma .NET Core 8. Si tienes pasión por la tecnología y un deseo de trabajar en un entorno dinámico y colaborativo, ¡queremos conocerte!

Dec 2, 2025

Apply

Junior Backend Engineer (.NET)

tgs

Full-time|On-site|Barcelona, Catalunya [Cataluña], Spain

Join our dynamic global team as a Junior Backend Engineer where you will play a crucial role in ensuring the quality, development, and implementation of our software solutions.As part of our technology department, you will collaborate with a diverse group of accomplished professionals located around the world, including teams in Barcelona, New York, London, Manchester, Bucharest, and India. If you’re passionate about technology and keen to make a significant impact within a rapidly growing company, we would love to hear from you!Your Role in TransPerfect – TechOps:The TransPerfect TechOps team has been integral to our success over the past decade, providing innovative technology and services that greatly enhance the experiences of our clients and colleagues. From streamlining workflows for our staff to developing essential services that underpin our GlobalLink platform, our work enables users to navigate complex ecosystems effortlessly.

Aug 21, 2025

Create account — see all 732 results

Browse all companies, explore by city & role, or SEO search pages. View directory listings: all jobs, search results, or location & role pages.