Senior Machine Learning Engineer

Greenhouse Software, Inc.; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Flexible working

Private Medical

Dental for you and family

Global opportunities

Generous holiday allowance

Pension/401K matching

Home office allowance

Parental/adoption support

Job summary

Speechmatics seeks a Senior Machine Learning Engineer to contribute to cutting-edge R&D in Speech AI. You will work on complex projects with a talented modelling team, focusing on transformer architectures and scalable training.

The role blends research and production-ready deployment, with mentoring opportunities and a hybrid office setup. Join a world-leading team advancing speech recognition through innovative ML techniques, collaboration across departments, and a focus on impactful,

Qualifications

• Experience in pursuing ambitious R&D agendas.
• Strong attention to detail while aligning with company goals.
• Familiarity with modern ML stack and transformer architectures.
• Experience with distributed training and model inference optimization.

Responsibilities

• Work on complex R&D projects with a diverse group of engineers to achieve ambitious goals.
• Stay current with the latest developments in machine learning.
• Execute high-impact projects to ensure team success.
• Mentor team members across departments where appropriate.

Skills

ML experience

Transformer models

Distributed training

Inference optimization

Publications

Open-source contributions

Technical writing

Tools

GQA

KV-caching

Dynamic batching

Flash attention

Speculative decoding

Job description

We are hiring a Senior Machine Learning Engineer to contribute to cutting‑edge Research & Development. As innovators in speech technology, our mission is to Understand Every Voice - a vision that has propelled us to be world leaders of Voice AI. Fuelled by innovation, inclusivity, and a passion for making a global impact through world‑leading Speech AI, we're looking for an experienced Senior Machine Learning Engineer to accelerate our efforts towards exceptional speech solutions.

Our Modelling Team trains diverse models, including large self‑supervised ones, supporting Speechmatics towards being the most accurate speech recognition system globally. It also ensures their deployment into production, working with the latest developments in ML, but also with the best engineering practices for software engineering and model serving.

What you’ll be doing:

• Work on complex R&D projects, with a diverse group of engineers, to achieve ambitious goals.
• Stay current with the latest developments in Machine learning.
• Execute high‑impact projects to ensure team success.
• Work collaboratively across departments and mentor team members (where appropriate).

Who we are looking for:

• Demonstrated experience in collaboratively pursuing ambitiousR&D agendas.
• Precise attention to detail, but is also aware of how the big picture relates to company goals, and where the field of Machine Learning is headed towards.
• Understanding of the modern Machine Learning stack, for example:
  • Knowledge of contemporary transformer architectures (e.g., GQA, KV‑caching) and best practices.
  • Experience in distributed training techniques.
  • Familiarity with optimisation strategies for model inference (e.g., dynamic batching, flash attention, speculative decoding).
• With preferred backgrounds covering some of the following:
  • Publications in top‑tier conferences.
  • Contributions to popular open‑source repositories.
  • Technical writing skills as evidenced by relevant publications or blogs.

Who we are:

Speechmatics is the leading expert in Speech Intelligence, and uses AI and Machine Learning to unlock business value in human speech worldwide. We work with an amazing mix of global companies, and our technology can integrate into our customers stack irrespective of their industry or use case – making it the go‑to solution to harness useful information from speech.

Joining us means working with some of the smartest minds around the world, focused on cutting‑edge projects and deploying the latest techniques to disrupt the market. We believe in putting people first; we’ll do all we can to help you develop your skills and give you the tools you need to thrive. Our Focus Fridays give you an undisturbed day of focus, offset with Together Tuesdays when we have our team meetings, so you've always got the right balance.

We have structured a hybrid approach that includes 2-3 designated office days each week. This arrangement ensures that while we embrace the advantages of remote work, we also maintain the vital connection and synergy that only in‑person interactions can foster.

This is only the beginning; we’re looking for amazing people like you to continue our journey…

What we can offer you:

• We offer incredibly flexible working, regular company lunches, and birthday celebrations.
• From Private Medical, and Dental for you and your family, through to global working opportunities, a generous holiday allowance and pension/401K matching, we want to make sure our employees and their families are looked after.
• Every employee will receive a working from home allowance for tech or home office equipment (on top of your choice of laptop and accessories of course).
• Our approach to parental leave is designed to support employees globally. While this varies by geo, we have support in place for parents (including adoption assistance and reproductive health services) to ensure they have the time and financial resources needed to care for their growing families.

At Speechmatics, our mission is simple: Understand Every Voice out there.

That’s not just about our tech – it's the heart and soul of who we are.We welcome different experiences, viewpoints, and identities. For us, it’s not just the right thing to do; it’s our catalyst for sparking innovation and creativity. Our teams thrive in an environment that celebrates and supports everyone – no matter their gender, identity or expression, race, disability, age, sexual orientation, religion, belief, marital status, national origin, veteran status, pregnancy, or maternity status.

But we don’t just open the door to diversity – we actively welcome it. Why? Because we believe every unique voice adds something special to our team, leading us to smarter solutions and a better workplace.

So, come as you are and join our Speechling community.

We’re building a place where every voice not only gets heard but is also respected and valued.