Senior Full Stack Engineer

LanguageWire Ltd; España; Presencial; EUR 90.000 - 130.000; Jornada completa

Descripción de la vacante

LanguageWire Ltd is hiring a Senior Full Stack Engineer to lead the build of a new customer-facing tool from ground up. You will influence architecture, tech direction, and team culture from day one, collaborating with a Product Manager and one more Engineer to shape the team and product.

You’ll own front-end interfaces, back-end services, databases, and CI/CD pipelines while guiding best practices, testing, and deployment automation.

Formación

• Experience building full-stack applications with frontend Vue and backend Python or .NET.
• Strong architecture, design patterns and code quality focus.
• Mentoring mid-level and junior developers and improving team processes.
• Hands-on in CI/CD pipelines and IaC tooling.

Responsabilidades

• Drive architecture decisions and technical direction for a new team.
• Develop and maintain front-end and back-end services and databases.
• Implement automated testing and deployment practices.
• participate in code reviews, sprint ceremonies and knowledge sharing.
• Own CI/CD pipelines and contribute to DevOps, security and reliability.

Conocimientos

Problem solving

Async programming

Communication

Agile development

C#

.NET

Vue.js

TypeScript

REST API

Microservices

EF Core

LINQ

Docker

Kubernetes

CI/CD

SQL (MSSQL/PostgreSQL)

Azure/AWS/GCP

RabbitMQ/Kafka

Herramientas

Git

EF Core

ASP.NET Web API

Vue

.NET 6+

Terraform/Helm

Azure/AWS/GCP

Descripción del empleo

• 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