AI Researcher Engineer

At Leadtech, we’ve been redefining digital businesses since 2009, creating innovative online solutions that reach millions of users every month. With a diverse team of over 700 members from 23+ nationalities, we’re united by a passion for creativity and collaboration.

We specialize in delivering user-centric experiences across web and mobile platforms, where people can connect with our products like never before.

We’re proud of our global reach and committed to fostering an inclusive workplace where every individual contributes to our shared vision of bringing cutting-edge projects to life. Learn more about our journey and mission on our About us! page!

About the role

Leadtech’s AI-LAB is an applied research unit embedded inside Leadtech. Our mandate is simple: take state-of-the-art AI research, prototype it fast, and ship it into products that millions of people use across Image, Video, Document, and Voice & Translation categories.

This is not a publish-papers lab. Every project is measured by whether it reaches production and creates measurable business impact. You’ll work with high autonomy, move quickly between research and implementation, and own your work end-to-end.

You identify recent advances in AI (models, techniques, architectures), evaluate their applicability to our products, prototype rapidly, and work with engineering teams to bring successful experiments into production.

Requirements:
We want a pragmatic researcher who ships and balance depth with speed and know when to go deep versus when to iterate.

• Experience working in ML / AI systems, or AI research roles, preferably with some experience deploying features into live products.

• Applied Mindset: A pragmatic Research Engineer who can balance exploration with feasibility, knowing when to go deep and when to iterate fast. You love shipping products.
• A Proactive Self - Learner reading-up and knowing and investigating recent and novel developments in the A.I Field, new releases and what are the current iterations of models & algorithms being released.
• Problem-Solving Mindset: You are a collaborative problem-solver, eager to take on new challenges and contribute to a very fast-paced development cycle.
• Technical Depth in Building & LLM´s: Strong hands-on experience with modern LLM Strenghts and their weaknesses frameworks and technique, LLamaIndex, langchain, MCP´s (Model Context Protocol),
• Coding & Experimentation Skills: Proficiency in Python, PyTorch, HuggingFace Transformers, LangChain, or similar libraries. Comfortable with experimentation frameworks
• Evaluation-Focused: Strong grasp of evaluation metrics, bias/robustness analysis, and how to validate LLM & RAG + Agentic outputs for reliability and business impact.
• Proficient in Python, FastAPI, Docker, Pydantic v2, Experience with hybrid search RAG architectures,, using vector databases (e.g., Pinecone, Weaviate,Llamaindex, FAISS, Vespa) and new and emerging RAG Techniques frameworks.
• Creativity and Proactivity: Assist in building reusable components (embedding pipelines, evaluation scripts). Help prepare datasets, run model evaluations, and document experimental findings.

Bonus Points (Nice to Have):

• AI Project Experience: Previous experience working on projects involving AI, machine learning, Deep Learning or interacting with large language models (LLMs).
• Knowledge of cloud platforms like Google Cloud Platform (GCP).

Benefits:
Growth and career development

• At Leadtech, we prioritize your growth. Enjoy a flexible career path with personalized internal training and an annual budget for external learning opportunities.

Work-Life balance

• Benefit from a flexible schedule with flextime and the option of working full remote or from our Barcelona office. Enjoy free Friday afternoons with a 7-hour workday, plus a 35-hour workweek in July and August so you can savor summer!

Comprehensive benefits

• Competitive salary, full-time permanent contract, and top-tier private health insurance (including dental and psychological services).
• 25 days of vacation plus your birthday off, with flexible vacation options—no blackout days!

Unique Perks

• If you wish to come, in our office in Barcelona you’ll find it complete with free coffee, fresh fruit, snacks, a game room, and a rooftop terrace with stunning Mediterranean views.
• Additional benefits include ticket restaurant and nursery vouchers, paid directly from your gross salary.

Join us in an environment where you’re free to innovate, learn, and grow alongside passionate professionals. At Leadtech, you’ll tackle exciting challenges and be part of a vibrant team dedicated to delivering exceptional user experiences

Equal Employment Opportunity Employer

Leadtech is an Equal Employment Opportunity (EEO) Employer, which means we encourage applications from people with different backgrounds, interests, and personal circumstances. Our team welcomes applicants regardless of their race, gender, age, religion, nationality, sexual orientation, and/or disabilities. All we need is your high energy, skills, and willingness to be part of a great project!

Location

You'll have the flexibility to choose whether you'd like to come to the office every day, from time to time, or work fully remote. We want you to find the best combination for you.

If you prefer to be surrounded with amazing people, our exceptional office is in Barcelona's Blue Building, located right on the city's seafront. Besides our stunning views, you'll enjoy our office perks such as free fruit, snacks, and coffee and you'll also be able to take part in our Mario Kart and table tennis competitions.

The personal data you provide will be used to manage your candidacy for the corporate selection processes that fit your profile. If you wish, you can exercise your rights of access, rectification or cancellation by sending a letter to Avenida Litoral, 12-14, 5ta planta, Barcelona 08005, or emailing us at [email protected], including a document that validates your identity.