Harnham
Research Engineer - Customer Feedback AI Scaleup
Requirements
Seeking a Senior Machine Learning Scientist experienced in training transformer models and LLMs for production use. Must be able to partner with product teams to ship ML systems and mentor colleagues in NLP and GenAI.
Job Description
Want to work on NLP problems where model quality genuinely matters?
Interested in building and evaluating production transformer models rather than simply orchestrating APIs?
Looking for a role where you'll directly shape the next generation of AI-powered customer intelligence products?
We're partnered with a fast-growing AI product company helping global brands better understand their customers through machine learning and natural language processing. Their platform analyses vast volumes of unstructured customer feedback to uncover actionable insights, enabling organisations to make better product and customer experience decisions. Rather than relying solely on third-party models, the team develops and deploys proprietary NLP and language models across core product workflows. This is an opportunity to join a highly technical, low-ego environment where applied research, experimentation and real-world impact sit at the centre of the roadmap.
Role Summary
Seeking a Senior Machine Learning Scientist to build, fine-tune and evaluate production NLP and language models across customer feedback intelligence products. You'll work on problems spanning sentiment analysis, retrieval, search, clustering, taxonomy generation and GenAI-powered insight generation while owning model performance from experimentation through deployment.
Key Responsibilities
- Train, fine-tune and optimise transformer models, LLMs and SLMs for production use cases
- Design and execute rigorous evaluation frameworks, experiments and benchmarking processes
- Build and improve semantic search, retrieval and reranking systems
- Develop solutions across aspect-based sentiment analysis, classification and taxonomy generation
- Partner closely with Product and Engineering teams to ship production-ready ML systems
- Contribute to model serving, monitoring and continuous improvement processes
- Mentor colleagues and bring relevant advances in NLP, GenAI and Machine Learning into production
Key Details
Salary: £90,000 (stretch to £100k) + equity
Working Model: 100% remote flexibility, with optional access to the London (Spitalfields) office
Tech Stack: Python, PyTorch, Hugging Face, Transformers, LoRA, PEFT, LLMs, SLMs, Qwen, Gemini, Retrieval Systems, Embeddings, Semantic Search
Visa Sponsorship: Available
Interested? Please apply below.
Skills
About Harnham
Harnham provides specialist Data and AI recruitment and staffing services, along with bespoke training solutions, across multiple industry verticals, operating in the UK, the USA and EU - contact us today to discuss your requirements: info@harnham.com Our recruitment and talent teams cover all aspects of the data and AI pipeline, from collection to consumption, across multiple data roles and functions. Whether you need full-time staff, contract talent, specialized training, Data-qualified graduates, or C-suite executives, Harnham Group is equipped to fulfill all your data talent requirements. Our five core services: * ATD - Rockborne – our graduate development arm – deploys expertly trained data consultants, who have gone through an intensive 12-week data training programme. After two years in the scheme, your consultant could become a * Contract / C2C / Freelance: Whether you're addressing a talent shortage, augmenting a project team, or encountering resource gaps, our specialist consultants offer bespoke interim talent solutions to address your unique challenges and drive success. * Full-Time / Direct Hiring: From early career professionals to senior management, our comprehensive services enable you to unearth outstanding data talent across various specializations, ensuring your organization thrives in the data-driven era. * Executive Search: With our dedicated executive search team and an extensive network encompassing the director to C-suite level, we assist both global corporations and ambitious startups in securing top-tier leadership talent to accomplish their goals. * GenAI, Prompt, LLM Training: Elevate your team's data expertise with our all-encompassing training programs covering essential tools and technologies such as Python, SQL, Machine Learning, LLM’s and AI. Highly bespoke, customised to your team learning requirements and budgets.