Fullstack .NET developer (Fluently)

This role sits at the intersection of localization engineering, cloud-native .NET services and practical AI. You will help build the platform that prepares, enriches, validates and exports translation content at scale, while turning LLM prototypes into dependable production workflows used across RWS.

It is a hands-on engineering position with ownership of microservices, shared AI tooling, observability and internal applications that support prompt management, evaluation and file-processing workflows.

About Product & Technology

Product & Technology plays a pivotal role in aligning the organization with its strategic objectives and enhancing shareholder value. Product & Technology is responsible for establishing unified standards and governance practices throughout the company. Additionally, we oversee the development and maintenance of core applications essential for the seamless operation of various functions across the organization. We are committed to driving and executing future roadmaps that are in line with the overall strategic direction of RWS. 

With a global reach, Product & Technology provides support services to over 7500 end users worldwide. We take pride in managing the information security operation and safeguarding all our assets. Our core functions encompass Enterprise & Technical Architecture, Network & Voice, Infrastructure, Service Delivery, Service Operations, Data & Analytics, Security & Quality Compliance, Transformation, Application Development, Enterprise Platforms, With a dedicated team of over 500 staff, Product & Technology ensures a strong presence across all regions, enabling efficient and effective support to our global operations.

Key Responsibilities

• Localization automation: build and maintain .NET microservices for segmentation, translation memory uploads, image and asset handling, quality data, and exports to the data warehouse.
• Production AI workflows: develop and operate LLM-based processes such as automated translation validation and terminology checks, with attention to reliability, cost and error handling.
• Shared AI platform: own the in-house LLM framework built on Semantic Kernel, including configuration, retries, validation and orchestration, and help evolve it towards Microsoft Agent Framework and support for local models.
• Internal tooling: build a Blazor application for prompt and configuration management, dataset exploration, file processing, and LLM/process evaluation.
• Engineering foundations: maintain shared libraries for database access, monitoring and messaging, keep technical documentation up to date, and own observability through OpenTelemetry, Prometheus and Grafana dashboards.
• Technical guidance: prototype solutions and advise other teams on LLM architecture and integration.

Skills & Experience

• 4+ years of professional experience with C# and .NET, including ASP.NET Core, EF Core and SQL Server.
• Production experience with LLMs, ideally Azure OpenAI or Microsoft Foundry, including prompt design, evaluation, cost awareness and error handling.
• Experience with Semantic Kernel or Microsoft Agent Framework.
• Background in microservices and message-based communication, such as RabbitMQ or similar technologies.
• Practical experience with Docker, Kubernetes, Helm and CI/CD pipelines in Azure DevOps.
• Strong testing habits using xUnit or a similar automated testing framework.
• Ability to own a solution end to end and communicate effectively in English.

Nice to have:

• Blazor, especially WebAssembly.
• .NET Aspire or Hangfire.
• Azure AI Document Intelligence, Vision or OCR.
• LLM evaluation frameworks, such as Microsoft.Extensions.AI.Evaluation or LLM-as-judge approaches.
• Experience with localization formats and tools, for example XLIFF, TMX or TMS platforms such as Phrase.

Our purpose is to unlock global understanding. This means our work fundamentally recognizes the value of every language and culture. So, we celebrate difference, we are inclusive and believe that diversity makes us strong. We want every employee to grow as an individual and excel in their career.

In return, we expect all our people to live by the values that unite us: to partner, putting clients fist and winning together, to pioneer, innovating fearlessly and leading with vision and courage, to progress, aiming high and growing through actions and to deliver, owning the outcome and building trust with our colleagues and clients.

RWS embraces DEI and promotes equal opportunity, we are an Equal Opportunity Employer and prohibit discrimination and harassment of any kind. RWS is committed to the principle of equal employment opportunity for all employees and to providing employees with a work environment free of discrimination and harassment. All employment decisions at RWS are based on business needs, job requirements and individual qualifications, without regard to race, religion, nationality, ethnicity, sex, age, disability, or sexual orientation. RWS will not tolerate discrimination based on any of these characteristics.

RWS Values

Get the 3Ps right – Partner, Pioneer, Progress – and we´ll Deliver together as RWS.

Recruitment Agencies: RWS Holdings PLC does not accept agency resumes.  Please do not forward any unsolicited resumes to any RWS employees.  Any unsolicited resume received will be treated as the property of RWS and Terms & Conditions associated with the use of such resume will be considered null and void.