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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Sr. Software Engineer_Fullstack - **Company:** GFT - **Location:** Vitoria-Gasteiz, Spain - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), .NET Framework, Agile Methodology, Amazon Web Services, Amazon Elastic Compute Cloud, Automation of Tests, C Sharp (Programming Language), Cloud Computing, Cloud Database, Software Quality, Code Review, Databases, Continuous Integration, Data Security, Software Debugging, Entity Framework, Design of User Interfaces, Microsoft SQL Server, Scrum Methodology, Software Engineering, SQL Stored Procedures, Transact-SQL, ReactJS, Snowflake, Backend, Front End Software Development, Api Design, Restful APIs, Jenkins - **Published:** August 16, 2026 - **Apply:** https://www.buscojobs.com.es/sr-software-engineer-fullstack-en-vitoria-ID-367546582 ## About the Role This is an exciting opportunity for an experienced engineer who enjoys working across the full software lifecycle - from user interface development and API design to database engineering, cloud infrastructure, and production support.You'll play a key role in delivering scalable, high-quality solutions within a collaborative Agile environment, contributing to both new feature development and the ongoing modernization of complex enterprise systems.A day in this role_Designing, building, and maintaining responsive front-end applications using React, JavaScript, and TypeScriptDeveloping robust, scalable APIs and backend services using C# and ., NET, and building APIs / backend servicesStrong front-end development experience using React, JavaScript, and TypeScriptSolid experience with SQL Server and T-SQL in data-intensive applicationsExperience working with Snowflake and cloud-based data platformsGood knowledge of Entity Framework and common repository/data access patternsFamiliarity with AWS, including services such as EC2, RDS, and related infrastructure conceptsExperience working in Agile teams and participating in standard delivery ceremoniesStrong problem-solving skills and the ability to work effectively in complex enterprise environmentsExcellent communication and collaboration skillsDesired or nice to have expertise_Experience with Hangfire or similar background job processing frameworksExperience working on legacy application modernizationFamiliarity with CI/CD pipelines, automated testing, and deployment best practices.Our Core values are focus to inclusion and diversity, all qualified applicants will be considered for ## Description Job description_About the Role_We're looking for a Senior Full Stack Developer to join our team and help build, enhance, and support business-critical applications across a modern Microsoft and JavaScript technology stack.This is an exciting opportunity for an experienced engineer who enjoys working across the full software lifecycle - from user interface development and API design to database engineering, cloud infrastructure, and production support.You'll play a key role in delivering scalable, high-quality solutions within a collaborative Agile environment, contributing to both new feature development and the ongoing modernization of complex enterprise systems.A day in this role_Designing, building, and maintaining responsive front-end applications using React, JavaScript, and TypeScriptDeveloping robust, scalable APIs and backend services using C# and .NETWorking across application, domain, and data access layers within a structured enterprise architectureDesigning, developing, and optimizing SQL Server / T-SQL queries, stored procedures, and other database objectsSupporting integrations between front-end applications, backend services, databases, and third-party/internal platformsWorking with cloud-hosted environments and infrastructure, including AWS services such as EC2 and RDSContributing to software quality through code reviews, testing, debugging, and performance tuningSupporting CI/CD and release processes using tools such as Jenkins and modern front-end build toolingParticipating fully in Agile ways of working, including sprint planning, backlog refinement, daily standups, reviews, and retrospectivesCollaborating closely with product, QA, and engineering stakeholders to deliver business valueThe expertise requested_Proven experience as a Senior Full Stack Developer or similar roleStrong hands-on experience with C#, .NET, and building APIs / backend servicesStrong front-end development experience using React, JavaScript, and TypeScriptSolid experience with SQL Server and T-SQL in data-intensive applicationsExperience working with Snowflake and cloud-based data platformsGood knowledge of Entity Framework and common repository/data access patternsFamiliarity with AWS, including services such as EC2, RDS, and related infrastructure conceptsExperience working in Agile teams and participating in standard delivery ceremoniesStrong problem-solving skills and the ability to work effectively in complex enterprise environmentsExcellent communication and collaboration skillsDesired or nice to have expertise_Experience with Hangfire or similar background job processing frameworksExperience working on legacy application modernizationFamiliarity with CI/CD pipelines, automated testing, and deployment best practices.Our Core values are focus to inclusion and diversity, all qualified applicants will be considered for employment and will go thru a fair recruitment process regardless of their race, religion, gender identity, sexual orientation, national origin or disability status.Your journey with us begins here!! ## Related Videos - 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