Senior Backend Engineer

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

Benefits offered by this job

Enhanced parental leave

Private medical insurance

Employee assistance programme

Remote work abroad opportunities

Apple MacBook and tech accessories

Onetrace merch, regular team socials &

Job summary

Onetrace is seeking a Senior Backend Engineer to own end-to-end feature delivery, focusing on APIs, data flows, and backend architecture while remaining hands-on with frontend tasks to deliver complete features.

You will mentor others, shape technical direction, and be responsible for production behavior and system performance. Strong experience in Node.js, SQL, MongoDB, and RESTful APIs is required.

Qualifications

• Proficient in Node.js backend development.
• Strong SQL and NoSQL data handling (MongoDB).
• Experience designing RESTful APIs and API integrations.
• Solid testing strategy coverage (unit, integration, E2E).
• Knowledge of observability, monitoring and logging practices.

Responsibilities

• Own end-to-end delivery of features across the stack.
• Design complex data flows, APIs, and background processing for high-volume operations.
• Take operational responsibility from architecture to production behavior.
• Build performant, well-tested backend services and stay involved with frontend as needed.
• Use metrics and feedback to inform technical decisions and improvements.
• Partner with product and design to translate requirements into technical solutions.
• Mentor other engineers to raise technical standards.

Skills

Node.js

SQL

MongoDB

RESTful API

Git

Backend testing

Observability

Scalable architecture

AI tools awareness

Job description

Reporting to: Director of Product Engineering

About the role

We're looking for a Senior Backend Engineer to design and own the systems that power our product. You will take end-to-end ownership of features with particular depth in APIs, data flows, and backend architecture, while remaining full-stack - comfortable shipping the frontend work needed to see a feature through without handing off. You'll take operational responsibility for what you build, help shape the team's technical direction, and mentor others as you go.

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:

• Our Product Engineering Culture – by Luca Carangella, Director of Product Engineering, on how we think about engineering and collaboration.
• Building Products for Subcontractors – by our Co-Founders, Lewis and Greg, outlining the mindset and manifesto that guide how we build.

What you'll do

• Own end-to-end delivery of features that solve real product problems, with particular depth in the application logic and database layers, through to shipped functionality across the stack
• 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
• Take operational responsibility for what you build - from architecture and implementation through to how it behaves in production
• Build performant, well-tested backend services, while staying hands-on with the frontend so you can take a feature all the way through without handing off - avoiding a backend-only silo
• Use product metrics, engineering signals, and feedback from your team to inform technical decisions, prioritise improvements, and validate that shipped features deliver measurable value
• Partner with product and design to shape solutions early, translating requirements into technical architecture and surfacing risks and opportunities that impact outcomes
• Mentor and coach other product engineers, raising the bar for technical excellence

What you'll bring

• Node.js – primary backend framework
• SQL databases and query optimisation
• MongoDB or other NoSQL database
• RESTful API design and implementation
• Git – version control and collaborative workflows
• Backend 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

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

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.

Full Job Description: https://onetrace.com/careers/senior-backend-engineer