Software Engineer II - Backend (Ruby)

Commerce Software UK Ltd; Greater London; On-site; GBP 65,000 - 95,000; Full time

Job summary

Commerce, the parent of BigCommerce, is building a robust Ruby on Rails backend for payments on the BigCommerce platform. Join a team delivering high‑availability checkout services, APIs, and secure payment integrations that power merchants worldwide.

We value production‑grade engineering, strong CI/CD, and thoughtful design, with a focus on reliability, security, and scalable architecture. You will mentor peers, own critical backend features, and collaborate with product and ops to move fast

Qualifications

• 3+ years of backend development experience, with Ruby on Rails.
• Production-grade systems: logs, traces, metrics, feature flags, live debugging.
• Familiarity with observability tooling: Prometheus, Grafana, Sentry, Lightstep.
• Experience with third‑party API integrations and stateful payment flows.
• Bachelor’s or equivalent in CS/EE/SW/CE/MIS, CI/CD knowledge.

Responsibilities

• Design, implement, and maintain features in a Ruby on Rails service for payments on the BigCommerce platform.
• Ensure production-grade functionality with tests, instrumentation, and documentation.
• Troubleshoot production issues and contribute to post‑incident reviews.
• Build scalable, secure, and maintainable backend services in collaboration with product and operations.

Skills

Ruby on Rails

Observability tools

Domain Driven Design

API integration

Education

Bachelor’s degree in CS, EE, SW, CE, MIS; or equivalent experience

Tools

PHP

Scala

Job description

Welcome to the Agentic Commerce Era

At Commerce, our mission is to empower businesses to innovate, grow, and thrive with our open, AI‑driven commerce ecosystem. As the parent company of BigCommerce, Feedonomics, and Makeswift, we connect the tools and systems that power growth, enabling businesses to unlock the full potential of their data, deliver seamless and personalized experiences across every channel, and adapt swiftly to an ever‑changing market. We believe in harnessing AI responsibly to unlock new possibilities, and we’re looking for individuals who use it intentionally to solve problems, accelerate outcomes, and expand what’s possible in their role. Our purpose is to help businesses confidently solve complex commerce challenges so they can build smarter, adapt faster, and grow on their own terms. If you want to be part of a team of bold builders, sharp thinkers, and technical trailblazers who shape the future of commerce, this is the place for you.

The Commerce Payment integrations team is looking for a Software Engineer who wants to make an impact at every level of society by powering innovators, creative thinkers, entrepreneurs, and business owners around the world to be successful at every stage of their growth. The Commerce Payment integrations team is responsible for building, operating, and continuously improving payment integrations on the BigCommerce platform - one of the most business‑critical and revenue‑sensitive areas of the product. Our team builds payment gateway integrations that help merchants securely process payments and support scalable, high‑performance, and flexible checkout experiences.

What The Team Owns

• Design and maintain payment integrations functionality and APIs, including cart‑to‑order flows and payments processing


• Ensures high availability, performance, and correctness for checkout and payments related services, given their direct impact on merchant revenue


• Partners closely with Product to evolve checkout and payments capabilities while balancing quality, security (PCI), and speed of delivery


• Owns incident management and on‑call responsibilities for checkout services due to their critical nature

What You'll Do

• Design, implement, and maintain features in a Ruby on Rails service for the payments offering on the BigCommerce platform


• Ensure functionality is production‑grade, with the appropriate test coverage on all layers, instrumentation in place, and documentation


• Troubleshoot production issues and contribute to post‑incident reviews to improve reliability


• Produce bullet‑proof code that is robust, efficient, and maintainable


• Work on challenging problems such as query optimization and performance optimization while adhering to security protocols


• Work closely with operations and infrastructure to improve the architecture while building and scaling back‑end services


• Engage in technical discussion of new solutions and architectures


• Build beautiful, scalable products using modern tools


• Collaborate with our product and design teams to define feature specifications and timelines


• Build new features with a focus on testability and extensibility


• Mentor other engineers in the current domain


• Review other engineer’s code to maintain and improve quality and security


• Support an open, positive, and energized culture


• Encourage innovation and foster an environment of continuous improvement


• Ensure that technical decisions support our goals of quality, performance, scalability, reliability, availability, and security

Who You Are

• 3+ years of professional backend development experience, with a strong focus on Ruby on Rails


• Solid understanding of building and operating production‑grade systems (e.g. you know your way around logs, traces, metrics, feature flags, and can debug live traffic issues)


• Familiarity with observability tooling (e.g. Prometheus, Grafana, Sentry and Lightstep)


• A good understanding of Domain Driven Design experience integrating with third‑party APIs and services, particularly those with nuanced state transitions (like payment flows).


• Education: Preferred Minimum Bachelor’s degree in CS, EE, SW, CE, MIS; or equivalent experience or completed either a comprehensive software engineering boot camp


• Experience with principles of continuous integration and designing, implementing and taking ownership of various tasks across the development cycle


• Experienced in developing high‑performance, scalable and available web services, and applications


• Experience with PHP and Scala is preferred

Inclusion and Belonging

At Commerce, we believe that celebrating the unique histories, perspectives and abilities of every employee makes a difference for our company, our customers and our community. We are an equal opportunity employer and the inclusive atmosphere we build together will make room for every person to contribute, grow and thrive. We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the interview process, to perform essential job functions and to receive other benefits and privileges of employment. If you need an accommodation in order to interview at Commerce, please let us know during any of your interactions with our recruiting team. Learn more about the Commerce team, culture and benefits at https://www.commerce.com/careers/

Identity Verification

To protect our candidates and company from fraudulent activity, our interview process may include a government ID and biometric verification via Persona, our trusted identity verification provider. All information is collected and processed securely in accordance with applicable privacy laws.

The Commerce story is one of global growth, incredible talent, and unstoppable passion in all we do. Despite our huge success so far, we’re still just getting started! Explore our history, mission and values. You’ll see we’re set on shaping the now - and the future - of ecommerce. We’re a group of clever, committed, curious people, unleashing talent in all we do. We believe in the power of togetherness, striving at the edge of what’s possible, impacting the lives of billions of people for the better. In all we do, We Do Extraordinary–and that’s no small feat! Our people are our power. It’s only through dedication, collaboration, and inspiration that we can Do Extraordinary. We’re natural problem‑solvers, champions of empowering businesses, and hungry learners… but we also play nerf wars in the office, support each other, and hang out outside of work.