Founding Machine Learning Engineer

Hey! We’re Semaloop. Last year, we began building and have secured over $3m in funding from investors and operators behind companies like Lovable, ElevenLabs, Hugging Face, Linear and Dropbox. We’re already relied on daily by cutting-edge companies like Granola and Gopuff.

We saw first-hand how building apps was being slowed by checks and balances. Whether at early-stage startups or tech giants like Apple, flaky tests blocked releases and QA slowed cycle time. Automating UI testing has been brittle and slow ever since the first smartphone came out in 2007. We’re on a mission to change that by building agents that test apps like humans do: through sight, sound and touch.

By solving for the human interfaces, developers don’t have to maintain special APIs, accessibility IDs or integrate new libraries. Instead, teams like Granola just describe how their app should work in plain English. When they ship new builds, Semaloop does the heavy lifting: verifying that the app works, and if not, figuring out what’s broken. That means an end to manual testing, and hours of time back per day for developers.

The Job: As a Founding ML Engineer, you won’t just be training models in isolation. You’ll be building the core systems that allow machines to understand and operate software interfaces like humans do. This is not a research-only role, and it’s not just applied ML either. You’ll own the full loop, from idea, to prototype, to production, to iteration, working directly with real product data and real customer problems.

We’re looking for…

• A Machine Learning Engineer with strong experience in computer vision and an interest in multimodality.
• Hands-on experience across modern machine learning and classical CV (CNNs, OpenCV).
• Someone who is comfortable taking systems from research to production, showcasing a blend of academic depth (MSc/PhD) and startup execution speed.
• Hands-on experience taking ML ideas from "works on my laptop" to real production systems.
• Calmness when life moves quickly and priorities shift.

As a person, you…

• Consider yourself first and foremost, a builder.
• Get excited at the idea of working together in-person from our office in Old Street (typically at least 3 days a week).
• Love working in a startup environment.
• Obsess over the customer experience, and quality in products you ship.

You can expect to…

• Design and build the core intelligence behind Semaloop.
• Own the end-to-end loop from research to prototype to production through to iteration.
• Work across multimodal models powering real-world computer use.
• Improve performance in the pursuit of real-time decision-making.
• Train, evaluate, and ship models into production systems.

What we offer:

• Competitive salary + equity
• 28 days holiday + bank holidays
• Private medical & dental (Bupa)
• Generous parental leave
• Pension matched up to 10% (Penfold)
• Life assurance, critical illness & income protection