Senior Product Engineer

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

Job summary

Onetrace Ltd is seeking a Senior Full-Stack Product Engineer to own features from concept to deployment, building scalable backend services and intuitive frontend experiences. You will shape technical decisions and champion best practices while advancing the product direction.

Join a hybrid team in Canary Wharf, delivering high-value capabilities for fire protection subcontractors across the UK. You’ll collaborate with product, design and customers, mentor peers, and help evolve engineering

Qualifications

• Experience delivering features from concept to deployment.
• Ability to design scalable backend systems and intuitive frontend experiences.
• Proven track record mentoring other engineers.

Responsibilities

• Own end-to-end delivery of features across UI, application logic and data stores.
• Build performant, accessible interfaces and reliable cross-device experiences.
• Inform technical decisions with user feedback, analytics and insights.
• Design data flows, APIs and background processes for high-volume workloads.
• Collaborate with product, design and customers to translate requirements into architecture.
• Mentor engineers through reviews, pairing and guidance.

Skills

Full-stack development

Backend design

Code reviews

Mentoring

Tools

Node.js

MongoDB

SQL

RESTful API

Git

AWS

Terraform

CI/CD

Job description

We’re looking for a Senior Full-Stack Product Engineer to join Onetrace as we continue to grow our platform. You’ll take ownership of features from concept to deployment, building scalable backend services and intuitive frontend experiences. You’ll also help shape technical decisions, champion best practices, and contribute to the future direction of our product.

LOCATION

Canary Wharf, Hybrid

basis

Full-time, permanent

DOE

About Onetrace

Great products start with great people.

Our focus on user experience has helped us become the leading software for fire protection subcontractors across the UK. We build tools that actually work on the ground - fast, intuitive, and simple to use.

Onetrace is growing quickly, recognised as one of the fastest-growing companies in the UK and in London’s construction sector. We’re bootstrapped, profitable, and on a mission to become a global ConTech leader.

Join a smart, ambitious team where your ideas matter and your work shapes what's next. Learn more about life at onetrace here .

What you’ll do

Own end-to-end delivery of features that solve real customer problems, from understanding user pain points through to shipped functionality across UI, application logic and database layers

Build intuitive, performant interfaces that customers actually want to use - balancing user needs, accessibility, and technical constraints while ensuring features work reliably across devices and contexts

Use customer feedback, analytics, and direct user insights to inform technical decisions, prioritise improvements, and validate that shipped features deliver measurable value

Design and implement complex data flows, API integrations, and background processing systems that handle high-volume operations reliably while maintaining system performance and data integrity

Partner with product, design, and customers to shape solutions early, translating business requirements into technical architecture while surfacing risks and opportunities that impact customer outcomes

Mentor and coach other engineers, raising the bar for technical excellence through code reviews, pair programming, and architectural guidance

Beyond the tech

We are building a team of Product Engineers because we believe the most impactful work comes from those who are closest to the problems we’re solving. For us, engineering is not just about executing a specification; it's about taking ownership of the user experience and the business outcome. Our engineers are partners in discovery and strategy, empowered to question assumptions, contribute to the 'why,' and use their technical creativity to build not just what is asked for, but what our users truly need.

We’re not your typical "move fast and break things" company. We believe in building thoughtfully and shipping quality software that genuinely helps our customers solve real problems.

Working here means being a product engineer, not just a backend or frontend specialist. We care about engineers who understand the bigger picture: the operatives on site, the project teams behind them, and the real-world impact of the tools we ship. You’ll bring curiosity to the "why" behind the work, not just the "how," and you’ll see your code in action helping people get their jobs done with less friction.

What this means day-to-day:

We encourage you to talk to users and understand their real challenges

Work as equals with product managers and designers to find the best solutions

Care about your work from conception through production and beyond

Balance shipping velocity with code quality and exceptional user experience

Speak up with ideas, concerns, and feedback to help the team improve

Embrace mistakes as learning opportunities and seek better approaches

We value transparency, honest communication, and engineers who genuinely care about the impact of their work. Subcontractors use Onetrace to prove their work has been carried out compliantly, with full traceability from start to finish. That not only makes their day-to-day smoother and more reliable, it also raises the standard across projects - ultimately leading to safer buildings for everyone to live and work in. And we think that’s something worth getting excited about.

Want to dig deeper?

If you’re curious about what it’s really like to build at Onetrace, we’ve written more about our approach, straight from the people you’ll be working with:

Node.js - primary backend framework

MongoDB or other NoSQL database

SQL databases and query optimisation

RESTful API design and implementation

Git - version control and collaborative workflows

Testing strategies (unit, integration, end-to-end)

Experience with monitoring, logging, and observability tools

Knowledge of scalable system architecture and design patterns

Familiarity with modern AI tools and a habit of staying up to date with how they can improve engineering workflows

Highly desirable

AdonisJS, NestJS or similar MVC frameworks

AWS infrastructure and services

Infrastructure as Code (Terraform or similar)

Message queues and background job processing

Caching strategies and performance optimisation

CI/CD pipelines and DevOps practices

Nice to have

Security best-practices implementation

Experience in a growth-stage startup or B2B SaaS

Knowledge of the construction industry

Hybrid guidelines

We operate a hybrid working model, with a minimum expectation of 2-3 days per week in the office. This is a core part of how the role works and isn’t something we’re flexible on.