Senior Search Engineer – Machine Learning

Our multi-award-winning FinTech client in Marbella is seeking a Senior Search Engineer – Machine Learning to join their fast-growing team.

The company has several offices worldwide, and the successful Senior Search Engineer will be part of their team in Marbella.

Join our client:

They are scaling new heights with their search technologies. They have a strong foundation and a talented team dedicated to solving complex challenges in information retrieval for the world's top financial professionals. Their mission is to architect and build the most sophisticated, scalable, and intelligent search engine in the market.

To accelerate innovation and redefine the standards of excellence in their industry, we are looking for a Senior Search Engineer to join the Search Team. This is a strategic role where you will act as a force multiplier, bringing specialized expertise in search systems to enhance our team's capabilities. We are looking for a hands-on engineer who is passionate about building production systems and thrives on optimizing every layer of the search stack—from low-level infrastructure to advanced ML-driven relevance.

If you are driven to build world-class systems and are excited by the opportunity to elevate a strong platform to its full potential, this is your chance to make a definitive impact.

 Senior Search Engineer – What You’ll Be Doing:

• Own the Search Infrastructure: Architect and develop our next-generation search infrastructure. Become a to-go expert for all things search-related.
• Build for Speed & Scale: Design, build, and maintain high-throughput, low-latency APIs for search, retrieval and query processing. Your work will directly impact the performance and reliability of our products.
• Productionize ML for search: In close partnership with our ML engineers and data scientists, implement and productionize state-of-the-art query understanding and ranking models. Optimize pipelines for generating and serving semantic embeddings at scale, leveraging vector search and modern language models.
• Drive Engineering & Experimentation Velocity: Establish best practices for search development and testing. Build tools and processes that empower the team to experiment and innovate rapidly and safely.
• Performance Tuning & Optimization: Profile and optimize every component of the search stack, from indexing and query processing to model inference, ensuring maximum efficiency and cost-effectiveness.
• Collaborate and Mentor: Work closely with product managers, engineers and data scientists to translate business needs into technical reality. Mentor team members, elevating their understanding of search systems and engineering best practices.
• Stay Ahead of the Curve: Actively evaluate emerging trends in ML, NLP, and Information Retrieval, prototyping new ideas to maintain our competitive edge.

What We're Looking For

• 5+ years of hands-on professional experience building and scaling production systems, with a deep focus on information retrieval.
• Deep, practical experience with modern search technologies. Hands-on experience working with and scaling vector databases (Vespa is preferred).
• Strong programming skills in Python. Practical experience with Java is a strong plus.
• Solid understanding of machine learning concepts applied to search (learning-to-rank, embeddings, language model quantisation…).
• Experience in environments where search quality is measured through offline evaluation, human-in-the-loop systems, or content-based heuristics.
• Exceptional quantitative and analytical skills. You can break down complex, ambiguous problems into concrete, actionable steps.
• Clear, concise, and effective communication skills in English. You can articulate complex technical ideas to both technical and non-technical audiences.
  
  

Only candidates with EU legal working status will be considered. 

Please check out their exceptional benefits:

• Free yearly health checkup
• Hybrid mode with 3 days in-office available
• Enrolment in the public healthcare system
• Onsite fully equipped Gym 
• Free breakfast served every day
• Free snacks and drinks
• Onsite Recreation Lounge
• Free shuttle bus to work
• Office parking available
• Regular team building events to foster company culture
• Financial assistance for relocation
• Assistance with Legal paperwork

What's in it for you?

• Growth Opportunity: Join a team building AI that truly matters, contributing to making Gen-AI useful for finance and business research in a rapidly growing company with 180+ team members across offices in Marbella, Madrid and New York.
• International Culture: Be part of a diverse, global organization with a truly international culture.
• Team of Superstars: Work alongside a talented team of professionals, including Silicon Valley executives and Wall Street veterans.
• Competitive Compensation: We offer a highly competitive salary package and performance-based bonuses.
• Relocation Assistance: Comprehensive relocation support is available to help you and your family move to the beautiful Costa del Sol.
• Work-Life Balance: Enjoy paid vacation, flexible time-off, and a flexible work policy.
• Continuous learning: We provide the support needed to grow within the team.