Senior Full Stack Engineer

LanguageWire; España; Presencial; EUR 90.000 - 120.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Private health insurance

Remote work option

Office in Valencia city center

Descripción de la vacante

LanguageWire is seeking a SeniorBackendStack Engineer to own and evolve the Translation Management System (TMS) platform and its connected services. You’ll set technical direction, drive architecture decisions, and ensure scalability, reliability, and maintainability across translation workflows, vendor/customer management, and integrations with internal services.

You will lead design of robust REST APIs, enforce non-functional requirements, and mentor the team while collaborating with product

Formación

• 5+ years backend engineering in production with C#, .NET Core and microservices
• Proven track record owning and evolving production services
• Strong distributed systems knowledge: event-driven architecture, queues (Azure Service Bus, RabbitMQ)
• Experience with AI developer tools
• Relational DB proficiency (MSSQL and PostgreSQL)
• Ability to document ADRs and architectural decisions
• Hands-on DevOps: CI/CD, Docker, Kubernetes, Azure
• Designing robust, versioned REST APIs with security considerations (OAuth 2.0, API keys)
• Frontend experience with Vue.js/TypeScript is a plus
• Mentoring of junior engineers and improving engineering practices

Responsabilidades

• Own and evolve foundational services for the TMS platform
• Lead backend architecture decisions and define service boundaries for scalability and maintainability
• Design and enforce API contracts that are clean, versioned, and well-documented
• Drive non-functional requirements: performance, observability, security, and availability
• Mentor mid-level and junior engineers through code reviews and architectural guidance
• Collaborate with product managers and domain experts to shape the platform roadmap

Conocimientos

Backend engineering

Architectural decision making

DevOps mindset

Mentoring

English fluency

Herramientas

Docker

Kubernetes

Azure

OpenAPI/REST APIs

Vue.js

TypeScript

SQL (MSSQL/PostgreSQL)

Descripción del empleo

LanguageWireis a global leader in language and content services, dedicated to helping brands achieve their full global potential. Since 2000,we'veevolved and built unique technology that enables seamless multilingual communication. Our worldwide network of language experts, together with our intuitive online platform, empowers brands to translate and manage multilingual content effortlessly.

The roleyou'llplay

As a SeniorBackendStack Engineer in the Core Platform Team,you'llbe a principal owner of theTMS (Translation Management System) Platform and connected services. That means driving the architecture, reliability, and evolution of services coveringtranslation workflow orchestration,vendor management,customer management, and integrations with ourinternalservices - file transformation, machine translation and many more.

You will set the technical direction for these services: defining how they scale, how they expose capabilities to other teams, and how theymaintainthe quality bar expected of infrastructure-grade software.

This is a role for someone who takes genuine pride in the craft of building robust, well-designed systems and who wants to be amultiplier: raising the technical level of the team around them, not just shipping code.

The teamyou'llbe a part of

You'lljoin the Core Platform Team, one of the foundational engineering teams atLanguageWire. The team owns andoperatesmultiple services that build up to the TMS Platform.These are the servicesour wholeoperation dependson.

We value outcomes over output, shared ownership over silos, and continuous delivery overlong releasecycles. Our stack is built on .NETservices, Azure, and modern API patterns.

If you want to make a difference, make it with us by...

TMS Platformownership

• Own and evolve foundational services:Take end-to-end ownership of platform service driving their architecture, reliability, and roadmap.

• Lead backend architecture decisions:Author architecture decision records, define service boundaries, and ensureservices are designed for scalability, resilience, and long-term maintainability.

• Design and enforce API contracts:Define andmaintainclean, versioned, well-documented REST APIs consumed by internal teams and, increasingly, by AI agents.

• Drive technical quality:Own non-functional requirements — performance, observability, security, and availability — across the services you lead.

• Own your services end-to-end:From architecture and coding to deployment, monitoring, and on-call support ("You build it, you run it").

Technical leadership & team growth

• Mentor and upskill the team:Support mid-level and junior engineers through code reviews, pairing, and hands-on architectural guidance.

• Set and raise the engineering bar:Champion best practices in testing, code quality, incident response, and continuous delivery across the team.

• Drive DevOps and operational excellence:Own CI/CD pipelines, deployment reliability, and ensure platform services are observable, resilient, and secure.

• Collaborate cross-functionally:Work with product managers and domain experts across the business to shape the platform roadmap and translate real needs into sound technical solutions.

In one year,you'llknow you were successful if...

• The core platform services you own are more reliable, better documented, and better understood across theorganizationthan when you joined.

• You have led at least one significant architectural improvement that measurably improved scalability, resilience, or developer experience for dependent teams.

• Your APIs and tool interfaces are trusted by both internal engineers and the AI orchestration layer — well-defined, stable, and easy to consume.

• Engineers on the team are measurably better for having worked alongside you — through code reviews, pairing, and the standardsyou'veraised.

LanguageWireis a global leader in language and content services, dedicated to helping brands achieve their full global potential. Since 2000,we'veevolved and built unique technology that enables seamless multilingual communication. Our worldwide network of language experts, together with our intuitive online platform, empowers brands to translate and manage multilingual content effortlessly.

The roleyou'llplay

As a SeniorBackendStack Engineer in the Core Platform Team,you'llbe a principal owner of theTMS (Translation Management System) Platform and connected services. That means driving the architecture, reliability, and evolution of services coveringtranslation workflow orchestration,vendor management,customer management, and integrations with ourinternalservices - file transformation, machine translation and many more.

You will set the technical direction for these services: defining how they scale, how they expose capabilities to other teams, and how theymaintainthe quality bar expected of infrastructure-grade software.

This is a role for someone who takes genuine pride in the craft of building robust, well-designed systems and who wants to be amultiplier: raising the technical level of the team around them, not just shipping code.

The teamyou'llbe a part of

You'lljoin the Core Platform Team, one of the foundational engineering teams atLanguageWire. The team owns andoperatesmultiple services that build up to the TMS Platform.These are the servicesour wholeoperation dependson.

We value outcomes over output, shared ownership over silos, and continuous delivery overlong releasecycles. Our stack is built on .NETservices, Azure, and modern API patterns.

If you want to make a difference, make it with us by...

TMS Platformownership

• Own and evolve foundational services:Take end-to-end ownership of platform service driving their architecture, reliability, and roadmap.

• Lead backend architecture decisions:Author architecture decision records, define service boundaries, and ensureservices are designed for scalability, resilience, and long-term maintainability.

• Design and enforce API contracts:Define andmaintainclean, versioned, well-documented REST APIs consumed by internal teams and, increasingly, by AI agents.

• Drive technical quality:Own non-functional requirements — performance, observability, security, and availability — across the services you lead.

• Own your services end-to-end:From architecture and coding to deployment, monitoring, and on-call support ("You build it, you run it").

Technical leadership & team growth

• Mentor and upskill the team:Support mid-level and junior engineers through code reviews, pairing, and hands-on architectural guidance.

• Set and raise the engineering bar:Champion best practices in testing, code quality, incident response, and continuous delivery across the team.

• Drive DevOps and operational excellence:Own CI/CD pipelines, deployment reliability, and ensure platform services are observable, resilient, and secure.

• Collaborate cross-functionally:Work with product managers and domain experts across the business to shape the platform roadmap and translate real needs into sound technical solutions.

In one year,you'llknow you were successful if...

• The core platform services you own are more reliable, better documented, and better understood across theorganizationthan when you joined.

• You have led at least one significant architectural improvement that measurably improved scalability, resilience, or developer experience for dependent teams.

• Your APIs and tool interfaces are trusted by both internal engineers and the AI orchestration layer — well-defined, stable, and easy to consume.

• Engineers on the team are measurably better for having worked alongside you — through code reviews, pairing, and the standardsyou'veraised.

Desired experience and competencies

• 5+ years of backend engineering experience in production environments, with deepexpertisein C#, .NET Core / .NET 8+, ASP.NET Web API, andmicroservicesarchitecture.

• Proventrack recordof owning and evolving productionservices: schema migrations, API versioning, backward compatibility, and long-lived service maintenance.

• Strong experience with distributed systems concepts: event-driven architecture, message queues (Azure Service Bus, RabbitMQ), sagas, idempotency, and eventual consistency.

• Strong experience with AI developer tools(Using and building custom agents, skills, instructions)

• Deepproficiencywith relational databases (MSSQL and/or PostgreSQL): complex query design, schema design, indexing strategies, and performance tuning.

• Demonstrated experience making and documenting architectural decisions (ADRs, system design, trade-off analysis) with the ability to defend and adapt your choices.

• Hands-on DevOps experience: CI/CD pipelines, Docker, Kubernetes, Azure — with the mindset that owning deployment and operations is part of the engineer's job.

• Experience designing robust, versioned REST APIs consumed by multiple teams, including security considerations (OAuth 2.0, API key management, rate limiting).

• Frontend proficiency (Vue.js and/or TypeScript) is valued, and you will contribute to frontend initiatives when needed, while backend and platform remain the primary areas of focus.

• A track recordof mentoring and upliftingjuniorengineers — through code reviews, design sessions, and raising the quality bar organically.

• Strong communicationskills and the ability to articulate technical decisions to both engineers and non-technical stakeholders. English fluencyrequired.

• Agile, collaborative, and opinionated in a constructive way — you push back when needed and bring others along.

This will make you stand out

• Experience with workflow automation frameworks (Temporal,Inngestor similar).

• Deep observability mindset: structured logging, distributed tracing (OpenTelemetry), alerting strategies, and SLO/SLA ownership for platform services.

• Experience with service mesh, API gateway patterns, or platform engineering practices at scale.

Our perks

• Flat hierarchies, real responsibility and autonomy, direct feedback, and room to stand up for your ideas.

• Internal development opportunities, ongoing support from your People Partner, and an inclusive and fun company culture.

• International company with over 300 employees. Offices in Copenhagen, Aarhus, Stockholm, Varberg, London, Leuven, Lille, Paris, Munich, Hamburg, Sophia Antipolis, Atlanta, Finland, and Valencia.

• Full-timeFlexiWire@homeoptionfor remote work. You're always welcome in the office to collaborate and connect.

• We take care of our people: Friday Bars, Summer and Christmas parties, and agenuinesocial culture.

• Excellent location in modern offices in Valencia citycenter, with a rooftop terrace overlooking Town Hall Square.

• Private health insurance.

• International environment — more than 20 nationalitiesin thecompany.

• Dog-friendly office, big kitchen with organic fruits, coffee, and snacks, plus a game room (foosball, darts, board games) and bike and car parking.

AboutLanguageWire

AtLanguageWire, we want to wire the world together with language. We are fueled by the most advanced technology (AI)and our goal is to make customers' lives easier by simplifying their communication with any audience across the globe.

Our values drive ourbehaviour

We are curious. We are trustworthy. We are caring. We are ambitious.

AtLanguageWire, we are curious and intrigued by what wedon'tunderstand. We believe relationships are based on honesty and responsibility. Weare caringand respect each other personally and professionally. Our desire to learn, build, and share knowledge is a natural part of our corporate culture.

Working atLanguageWire— why we like it

"As a Senior Full Stack Engineer atLanguageWire, my day is dynamic and collaborative, particularly within the Machine Learning team. I work closely with Machine Learning Engineers to integrate advanced AI capabilities into our web applications and APIs, aiming to enhance customer experiences through innovative features. I also collaborate with other development teams to ensure seamless integration and alignment of our technology solutions, fostering continuous learning and driving the evolution ofLanguageWire'stechnology."

(Cristian, Senior Full-Stack Engineer, Poland)

Yes, to diversity, equity & inclusion

AtLanguageWire, we believe diversity in gender, age, background, and culture is essential for our growth. We are committed to creating a culture that incorporates diverse perspectives andexpertisein our everyday work. Our recruitment process is designed to be transparent and fair for all candidates. We encourage candidates of all backgrounds to apply.

Want to know more?

Wecan'twait to meet you! So, why wait 'til tomorrow? Apply today!

If you want to know more aboutLanguageWire, visit our website at www.languagewire.com