Staff Product Engineer (up to £120k)

Dex; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Dex is partnering with a company building a scalable, impact-driven platform that manages and optimizes essential services for millions of users. You will own features end-to-end, from initial concept through shipping and measuring impact, while balancing direct product work with building internal tools that empower others to move fast safely.

The Staff Product Engineer role emphasizes breadth over depth, with hands-on work on service lines and cross-cutting tooling.

Qualifications

• 2+ years of professional engineering experience.
• Proven ability to own problems end-to-end, from fuzzy requirements to shipped solutions and impact measurement.
• Strong full-stack proficiency in TypeScript and React, comfortable with distributed systems challenges and external integrations.

Responsibilities

• Build and launch new agentic service lines from concept to live deployment.
• Design and implement core product improvements with a small team.
• Develop internal tooling and guardrails enabling non-engineers to ship product changes independently.
• Tackle long-running workflow orchestration, retries, and integrations with external systems.
• Iterate rapidly on product experiments using data to prove impact and inform direction.

Skills

TypeScript

React

Full-stack

End-to-end ownership

Problem solving

Tools

Distributed systems

Job description

This role is with one of Dex's trusted partner companies. We work closely with their teams to truly understand their culture, goals, and what they're looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process.

The role

Imagine an agent that doesn't just compare household services, but actively manages and switches them on behalf of millions. This company is building exactly that: a system designed to fix the problem of overpaying for essentials like energy, mobile, and insurance, without requiring any user effort. They've developed a unique set of capabilities, including agentic communication, multimodal data extraction, and long-running workflow orchestration, all underpinned by a 'Blueprints' system for rapid service line expansion. With significant traction and rapid growth, they are backed by leading investors and committed to social impact as a B Corp.

As a Staff Product Engineer, you'll have end-to-end ownership and high agency across the most impactful parts of the codebase. This isn't a role where you just build features from a perfect spec; you'll operate in two distinct modes. Sometimes you'll build direct product — new service lines or core improvements — moving fast from a rough plan. Other times, you'll build the multiplier: the guardrails and internal tooling that empower non-engineers to ship safely. Both are hard engineering problems, and both directly feed into the company's mission.

The work

• Build and launch new agentic service lines, from initial concept to live deployment.
• Design and implement core product improvements, often working with one or two other engineers.
• Develop internal tooling and 'guardrails' that enable non-engineers to ship product changes independently.
• Tackle complex challenges in long-running workflow orchestration, retries, and integrations with external systems.
• Iterate rapidly on product experiments, using data to prove impact and inform future direction.

What You Bring

• At least 2 years of professional engineering experience, with a clear desire for breadth over deep specialization.
• Proven ability to own problems end-to-end, from fuzzy requirements to shipped solutions and impact measurement.
• Strong full-stack proficiency in TypeScript and React, comfortable with distributed systems challenges like partial failure and external integrations.
• A product-first mindset: you care deeply about user flow, UX, and the impact of small details like copy.
• A track record of building leverage for others, whether through pairing, clear explanations, or impactful internal tools.

Why apply through Dex

This isn't a typical product engineering role; opportunities to build at this level of impact and ownership are rare and often oversubscribed. Applying through Dex means you skip the cold application process and get a proper briefing on the role and company before you even interview. We help you cut through the noise to find roles that genuinely beat your current job, ensuring you're matched to opportunities that align with your unique skills and career goals.

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