Senior Software Engineer, Billing & Revenue in London

About Gigs

At Gigs, we're building the operating system for mobile services—a platform that lets tech companies embed global connectivity into their products effortlessly. Just as Stripe lets any business add a payment button in seconds, Gigs empowers platforms to weave in connectivity—bridging the traditional world of telecom with modern tech. From fintechs launching mobile services to HR platforms offering work phone plans, we automate provisioning and remove telecom complexity. Our team of around 150 people across the US and Europe is backed by nearly $100 million in funding from Ribbit Capital, Google, and Y Combinator. As one of the fastest-growing tech companies, we bring together early-stage engineers, product builders, and business athletes from companies like Stripe, Airbnb, and Shopify. We’re tackling deep technical and regulatory challenges to make connectivity truly seamless. If you’re driven by curiosity, creativity, and the chance to shape the future of telecom, we’d love to hear from you.

Things We Care About

• We are building in a highly complex space and tackling a massive problem. We want people who lean in when things get hard.
• Speed. We move and we ship. We set bold deadlines and treat every week like it matters.
• Ownership. If you see something broken, fix it. We don't wait for permission.
• Customer Obsession. Our customers' product is our product.
• Ambiguity. We're building frontier technology in a complex domain. You'll need sound judgement and good instincts to make decisions without complete information.
• First principles. We don't ask how things have been done before. We ask why they were done that way at all.

The Role

As a Senior Software Engineer on Revenue, you'll own the systems that turn Gigs' business into money in the bank. Gigs is a B2B2C business: consumers get connectivity through our partners' products, and we bill those partners for it. You'll focus on the B2B side — the partner billing system that sits at the center of how Gigs earns revenue. Billing has to be right. You'll build systems that turn usage and commercial agreements into accurate, auditable invoices, and you'll build the checks and observability that keep them trustworthy as we scale. You'll also work well beyond billing itself, building integrations with other backend systems like our ERP and Data Platform so revenue data flows cleanly across the company. This is a cross-functional role. Your closest partners outside engineering are Finance and Go To Market teams, and a big part of the job is translating commercial models and partner deals into working software. You'll join reporting into our Head of Data. The goal is to spin up a dedicated Revenue team — so this is also a chance to help shape a new team and problem area from the ground up.

• Own our partner billing system end-to-end: the platform that turns usage and commercial terms into accurate, auditable invoices for our partners.
• Build and maintain integrations with other backend systems, including our ERP and Data Platform, so revenue data is consistent and reliable across Gigs.
• Work primarily in Go, our main language for backend services, alongside PostgreSQL and event-driven tooling.
• Partner closely with Finance and Business Development — sit down with them, understand a commercial model or a new partner deal, and turn it into something that works in production.
• Design for correctness and observability. You'll build the tests, monitoring, and reconciliation that make revenue numbers something people can rely on.
• Take complex problems from scoping through to production, and operate what you build.
• Help shape the foundations, practices, and roadmap of a new Revenue team as it forms.

You can find more about how we work on our engineering page.

Salary range for Senior Engineer:

• EU: €90,000 - 125,000
• UK: £90,000 - 125,000

(The final offer depends on your background, skills, and how you perform through the process. We're open to considering mid, senior and staff-level candidates, which may result in an adjustment to the scope and compensation)

What We Are Looking For

• You have strong backend engineering experience and are fluent in Go. You've built and run production services, and you care about the quality of the software you produce. Go experience is required for this role.
• You use AI as a core part of how you work, not an occasional shortcut. That means prompting agents with context and intent, reviewing what they produce critically, and knowing when to push back.
• You can explain the code an agent wrote, catch when it oversteps the ask, and form your own opinion on whether the output is actually good.
• You're curious about how the tooling is evolving and actively working to get better at it.
• You think in systems and care about correctness. You understand that billing and revenue systems have little room for error, and you design for it — with clear data models, good tests, and observability built in.
• You enjoy working across teams. You can talk to Finance or Business Development, understand what they need, and turn a commercial model into something that runs reliably.
• You love learning technologies as you go. You always want to find the right tool for the job, and don't only follow what you already know.
• You care about more than just engineering. You need to see the business impact of everything you do.
• You know how to make speed/quality trade-offs.

Bonus Points If:

• You've worked on billing, payments, invoicing, metering, or revenue systems before.
• You have experience integrating with ERP systems or building data pipelines against a data platform / warehouse.
• You have experience with our stack: Go, PostgreSQL, GCP, Solvimon, PubSub.
• You've worked in fintech, payments, telecom, or other regulated industries where reliability and correctness matter.