Senior .NET and AI Software Engineer

Porto, Portugal; Braga, Portugal

Senior (4-6 Years)

Hybrid

English Required Not Accepting Candidates Living Abroad

Senior .NET & AI Software Engineer

The Euronext Corporate Solutions team is composed of over 200 professionals that combine a strong local footprint across Europe with a deep understanding of global capital markets. They help organisations, both listed and non-listed, private and public, make the most effective use of capital markets and run more efficiently.

Euronext Corporate Solutions already serves more than 4,500+ clients including over 1000listed companies, private companies, advisors and public organisations. Our clients are located across all Euronext markets (Belgium, France, Italy, Ireland, Netherlands, Norway Portugal,) but also beyond (e.g. UK, Nordics, Spain, Germany).

This unique and comprehensive value proposition is articulated around four main pillars:

Governance : Our board portal solution “iBabs” help organizations to secure, organize and run board meetings more efficiently (save time preparing agendas and board packs, collaborate easily with annotations, voting, meeting summaries).

Communication : We are the market leader in webinars and webcasts services for financial results, internal communication, marketing and external communication with our solution Company Webcast. We help our clients to increase their visibility, engagement and international coverage. We also provide flexible and customized market data components for Investor Relations websites of listed companies.

Compliance : Our InsiderLog products offer a solution to automate the management of inside information and insider lists for both issuers and their professional advisors. Our tool aims to save time and ensure compliance with the European Market Abuse Regulation (MAR).

Investor Relations : Our Advisory team provides high-touch advisory, market intelligence and decision making analytics for listed companies willing to be more active on capital markets. Our IR.Manager tool provides a complete and intuitive IR management and targeting platform for corporate IR teams to professionalize the workflow and engagement.

Euronext Corporate Solutions is a fully integrated division, including all the resources to pursue its business activities: Sales, Marketing, Client Excellence, Product, Technology.

Senior AI Software Engineer

This position is within the Framework and Research team, responsible for developing cross-functional services and foundational components used across all business lines. In this role, you will bridge the gap between robust backend architecture and innovative AI solutions—designing, fine-tuning, and deploying custom machine learning models to enhance our core platforms.

Key Responsibilities

• Translate business requirements into functional applications and innovative AI/LLM solutions
• Design, fine-tune, deploy, and optimize AI/ML models for real-world applications
• Develop and refine prompts for LLM-based solutions (prompt engineering) and experiment with model parameters (e.g., temperature, top-p)
• Create proofs of concept (POCs) for R&D using notebooks (e.g., Jupyter) and analyze complex datasets
• Ensure AI governance, implementing guardrails, auditing, and secure usage best practices
• Design scalable, cloud-native architectures, build and integrate AI solutions into business line applications
• Collaborate with cross-functional teams, conduct code reviews, and mentor team members

Required Experience

• Bachelor’s/Master’s degree in Computer Science, Engineering, or a related field
• Minimum 5+ years of hands-on software development experience, with solid database and scalable system design knowledge
• 2+ years of experience in Machine Learning, Generative AI, or Data Science, with good proficiency in Python
• Hands-on experience with AI model fine-tuning, prompt engineering, and LLM frameworks/tools (GPT, Transformers, Hugging Face)
• Strong cloud experience with AWS (SageMaker, Bedrock) or Azure equivalents
• Experience with containerization (Docker, Kubernetes) and DevOps/CI/CD pipelines
• Solid grasp of trusted AI practices, API security, AI guardrails, and data privacy
• Excellent problem-solving skills, Agile/Scrum proficiency, and fluent English

Nice to Have

• Relevant cloud or AI certifications (AWS/Azure)
• Experience building production-grade AI solutions
• Exposure to MLOps and AI governance frameworks
• C# with .net or Java with Spring Boot

This position is for a Senior .NET & AI Software Engineer within the Framework and Research team, responsible for developing cross-functional services and foundational components used across all business lines. In this role, you will bridge the gap between robust backend architecture and innovative AI solutions—designing, fine-tuning, and deploying custom machine learning models to enhance our core platforms. Key accountabilities include:

Role & Key Accountabilities

• Design, build, and maintain efficient C#/.NET code alongside production-ready ML pipelines.
• Translate business requirements into functional applications and innovative AI/ML solutions (focusing on NLP and LLMs).
• Fine-tune, deploy, and optimize pre-trained models for specific product use cases.
• Create proofs of concept (POCs) for R&D projects and analyze complex datasets to derive insights.
• Collaborate with the Product Owner and cross-functional teams to meet delivery timelines.
• Conduct code reviews, mentor team members, and ensure the overall quality of software and AI deliverables.
• Maintain comprehensive documentation for both software architecture and AI algorithms.
• Prioritize client issue resolution to adhere to SLAs and actively flag technical debt.

Knowledge, Skills & Experience Required

• Bachelor’s/Master’s degree in Computer Science, Engineering, or a related field.
• Minimum 5+ years of hands-on experience in C# and .NET/.NET Core.
• 2+ years of experience in Machine Learning, Generative AI, or Data Science.
• Proficiency in Python and AI frameworks (TensorFlow, PyTorch) alongside .NET.
• Hands-on experience with NLP tools (Hugging Face) and LLM frameworks (GPT, Transformers).
• Strong knowledge of cloud platforms (Azure/AWS), microservices, and deploying custom models.
• Experience with containerization (Docker, Kubernetes) and DevOps/CI/CD pipelines.
• Solid grasp of trusted AI practices, API security, and data privacy.
• Excellent problem-solving skills, Agile/Scrum proficiency, and fluent English.

We connect IT professionals with projects that match their skills, professional experience, and goals, then we offer a career progression program, delivered by in-house specialists - our People Experience Partners - to guide them through our journey with us.

What we offer:

A project that matches your skills and ambitions, as well as your preferences for working policies and culture.
A competitive salary with awesome benefits and opportunities to leverage your knowledge and network to earn additional income.
An empowering and respectful work culture enriched with social and learning events.
A People Experience Partner specially assigned to you - your go-to career guide, responsible for supporting your growth, facilitating training, and ensuring your work-life balance at KWAN.

At KWAN, they make sure that I feel comfortable with the client I’m working for and that what I’m doing aligns with my career aspirations.

Luis Caldeira, DevOps @ KWAN

At KWAN, I’m given the space to be myself and do what I love. I have control over the projects I work on, as well as the direction of my career.

Pedro Fonseca, Front End Developer @ KWAN

I see my People Experience Partner as someone who is always available to provide me with motivation and constant feedback, which helps me be sure that I am in the right place.

Josimar dos Reis, Software Developer @ KWAN

I know that I’ve contributed to the growth of a company that truly values a “people first culture”, because my ideas, experiences, and individuality were always appreciated.

João Nascimento, Software Developer (KWAN Alumni)

My two years at KWAN were an incredible experience! From the start, I was welcomed into a warm and collaborative environment where I felt truly supported.

Laís Ortiz, Software Developer @ (KWAN Alumni)

Grab this opportunity, apply now!