We’re launching a new team dedicated to modernizing and expanding one of our customer-facing tools — and we’re looking for a Senior Full Stack Engineer to help build it from the ground up

This isn’t a legacy product handoff: you’ll be joining at the very start, shaping both the technical direction and the team culture from day one

The current stack is Vue.js on the frontend and Python on the backend, but we’re planning a migration to .NET in the near future

As the senior engineer, you’ll take a leading role in architecture decisions, technical direction, and mentoring as the team grows

You’ll be one of the founding members of a brand-new team, led by our Tech Team Lead

We’re actively growing the team and expect to bring on a Product Manager and one additional Engineer alongside you

This means you’ll have real influence over how the team is structured, how we work, and the technical foundations we build on — it’s a rare chance to help define a team’s culture and practices from the very beginning, rather than stepping into something already set

Developing and maintaining applications, including front‑end interfaces, back‑end services, and databases

Contributing to the architecture, design and implementation of new features and improvements

Implementing best practices for code quality, testing and deployment automation

Ensuring high‑quality software through active participation in code reviews

Actively engaging in sprint retrospectives, refinements, daily stand‑ups, and other team processes

Taking full ownership of the products and solutions you develop, eliminating bugs early in the process through TDD/BDD and other tests





Leveraging AI‑assisted development tools and workflows to increase engineering velocity, while maintaining code quality and rigor

Sharing knowledge and supporting fellow developers, QA professionals, and support teams

Supporting team leaders with your expertise and assist in customer meetings

Owning CI/CD pipelines to ensure seamless operations

In one year, you’ll know you were successful if..

You are fully integrated as part of the team and have built strong working relationships

You actively contribute to maintaining a positive, collaborative, and knowledge‑sharing team atmosphere

You take full ownership of products and solutions, having delivered several major features to production with measurable impact

You share your expertise by mentoring mid‑level and junior developers, helping them grow and succeed

You contribute to improving team processes, code quality, and technical decision‑making

Because of this, we’re looking for someone comfortable working across all three — Vue, Python, and .NET — who can help drive that transition while continuing to ship new feature

Strong problem‑solving and communication skills

Familiarity with asynchronous programming and performance optimization in .NET

Motivational and engaging with a “can do” attitude,



fostering a positive team environment

Comfortable working in agile development environments and participating in sprint planning, code reviews, and peer mentoring

Extensive experience with C# and the .NET ecosystem (.NET Core/.NET 6+, ASP.NET Web API, etc.)

Responsible for front‑end codebases using Vue.js and/or TypeScript, collaborating closely with full‑stack and frontend developers

Sound understanding of frontend build tools and state management (Vuex, Pinia, or similar)

Solid understanding of software architecture, design patterns, and best practices

Experience with automated testing frameworks (unit, integration, and end‑to‑end)

Ability to collaborate effectively in cross‑functional teams, including product, design, and QA

Experience with version control systems (e.g., Git) and CI/CD practices

DevOps experience: CI/CD pipelines, Infrastructure as Code (Terraform, Helm, etc.), Docker, Kubernetes, cloud services (Azure, AWS, or GCP)

Experience with Python

Solid understanding of RESTful API design and integration

Knowledge of microservices architecture and event‑driven systems

Hands‑on experience with Entity Framework (EF Core) and LINQ

Familiarity with message brokers (e.g., RabbitMQ, Kafka, Azure Service Bus)

Awareness of security best practices in software development

Strong focus on testing practices (unit testing, integration testing, test automation)

Ability to mentor others and foster knowledge‑sharing within the team

Proficiency with relational databases, particularly MSSQL and/or PostgreSQL

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📌 Senior Full Stack Engineer (Madrid)
🏢 LanguageWire
📍 Madrid