Overview

Join to apply for the Senior Backend Engineer role at Onetrace.

Basis: Full-time, permanent. Location: Canary Wharf, London - WeWork (Hybrid Remote). Reporting to: Director of Product Engineering. Onetrace is expanding into new trades and going global. We are bootstrapped, profitable, and driven by a clear mission to lead the digital transformation for subcontractors, one trade at a time.

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. You’ll see your code in action helping people get their jobs done with less friction.

Want to learn more about our journey? Check out our LinkedIn page. We value transparency, honest communication, and engineers who genuinely care about the impact of their work.

The role

As a Senior Backend Engineer at Onetrace, you’ll strengthen our backend systems and empower the entire engineering team to build with confidence and velocity. You’ll tackle technical debt, evolve our architecture for scale, and create well-documented patterns and tooling that make our platform more resilient, performant, and developer-friendly. You’ll collaborate across the stack with engineers, product managers, and designers to ensure our platform foundations enable great product experiences.

What you’ll do

• Design, build, and maintain backend services using Node.js and TypeScript
• Evolve our architecture for scalability, performance, and maintainability
• Refactor and modernise legacy systems to reduce technical debt
• Design and enhance RESTful APIs with security and clear documentation
• Integrate with internal and external services, building reliable, well-tested connections
• Implement and improve observability: logging, metrics, monitoring, and alerting
• Optimise database performance across MongoDB and SQL-based systems
• Introduce and maintain patterns, tooling, and frameworks that improve developer experience
• Collaborate cross-functionally to translate product requirements into technical solutions
• Mentor engineers through code reviews, pairing, and knowledge-sharing sessions

Beyond the backend

We expect engineers to think and work like full stack product engineers – flexible, collaborative, and willing to jump into whichever part of the stack will best solve the problem. This may include refining APIs, scaling services, pairing with frontend engineers, or tweaking infrastructure to remove bottlenecks.

• 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
• Backend testing strategies (unit, integration, end-to-end)
• Monitoring, logging, and observability tools
• Knowledge of scalable system architecture and design patterns

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

What we offer

• Enhanced parental leave
• Private medical insurance with Bupa
• Employee assistance programme
• Remote work abroad opportunities
• Apple MacBook and tech accessories
• Onetrace merch, regular team socials and annual company offsites

Onetrace is committed to diversity in the workplace and proud to be an equal opportunity employer. If you require a reasonable adjustment, please contact us. All information will be kept confidential and used for applying a reasonable adjustment.

Please note that our office is a dog-friendly environment. Dogs may be present in shared spaces; please raise any allergies or concerns in advance.

Seniority level

• Mid-Senior level

Employment type

• Full-time

Job function

• Engineering and Product Management
• Industries: Software Development

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