Senior Software Engineer - Front-End

Speechmatics; Greater London; Hybrid; GBP 90,000 - 120,000; Full time

Benefits offered by this job

Private Medical

Dental for you and family

Pension matching

Working from home allowance

Flexible working

Company lunches

Birthday celebrations

Job summary

Speechmatics is seeking a Senior Front-End Software Engineer to own end-to-end feature development for our user platform, from ideation to shipping and iteration based on user feedback.

You will build polished interfaces with React, JavaScript, HTML, and CSS, make independent UX/UI decisions, and run A/B tests leveraging analytics to inform product choices. Collaboration with designers, PMs, and backend engineers is essential for delivering impactful features.

Qualifications

• Proven track record shipping production frontend code.
• Product-minded engineering mindset.
• Independently own UX/UI decisions.
• Experience with iterative development and A/B testing.
• Familiar with analytics tools such as Mixpanel.
• Experience collaborating with designers, PMs, and backend engineers.
• Strong frontend testing practices.

Responsibilities

• Own product features from ideation through delivery, contributing to UX thinking, frontend execution, and post-launch iteration.
• Build polished, accessible user interfaces using React, JavaScript, HTML, and CSS.
• Make UX and UI decisions independently, collaborating closely with designers and PMs.
• Design and run A/B tests to validate product decisions and surface insights to improve UX.
• Use analytics tooling such as Mixpanel to understand user interactions and feed insights back into development.
• Partner with backend engineers, product managers, and designers to ship features that move the needle.
• Write and maintain robust UI tests, ensuring quality in production and at scale.
• Run user interviews to understand how people use the product and what drives adoption.

Skills

React

JavaScript

HTML

CSS

Product mindset

UX decisions

A/B testing

Mixpanel

UI testing

Team collaboration

Tools

UI testing frameworks

Job description

At Speechmatics, we're expanding our user platform offering. We're looking for a Senior Front-End Software Engineer with a strong product mindset to help drive that growth. This is an opportunity to own end-to-end feature development at a leading-edge AI company, from shaping the user experience through to shipping and iterating based on real user feedback and analytics data.

What you'll do

• Own product features from ideation through to delivery, contributing to UX thinking, frontend execution, and post-launch iteration
• Build polished, accessible user interfaces using React, JavaScript, HTML, and CSS
• Make UX and UI decisions independently, collaborating closely with designers and PMs rather than waiting on detailed handoffs
• Design and run A/B tests to validate product decisions and surface insights that improve the user experience
• Use analytics tooling such as Mixpanel to understand how people interact with the product and feed that learning back into what gets built
• Partner with backend engineers, product managers, and designers to ship features that genuinely move the needle for users and the business
• Write and maintain robust UI tests, taking ownership of quality in production and at scale
• Run user interviews and meet customers to understand how people use the product and what drives adoption

What you'll need

• Proficiency in React, JavaScript, HTML, and CSS with a track record of shipping production-quality frontend code
• A product-minded engineering approach
• Comfort owning UX and UI decisions independently
• Hands-on experience with iterative development practices, including A/B testing and feature experimentation
• Familiarity with user analytics tools such as Mixpanel or a comparable platform
• Experience with UI testing frameworks and a solid grounding in frontend engineering best practices
• Confidence collaborating cross-functionally with designers, PMs, and backend engineers
• A track record of using user feedback and data to improve features

Nice to have

• Experience using coding agents (eg Claude, Codex, OpenCode) to improve productivity and code quality
• Exposure to backend development, including RESTful APIs and cloud deployments
• Experience conducting or participating in user interviews as part of a product discovery process

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

• No matter what stage of your career you're at - from paid internships and first-job opportunities through to management and senior positions - we'll support you with the training and development needed to reach your career aspirations with us. There really is no shortage of opportunities here for you to get involved and collaborate with those around you to deliver your best work.
• We offer incredibly flexible working, regular company lunches, and birthday celebrations. But that's not all. We've spoken to our teams to find out what they want. 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 supp