Senior Software Engineer

Formula.; Greater London; On-site; GBP 72,000 - 120,000; Full time

Benefits offered by this job

Equity

Central London office

Salary up to £120,000

Job summary

Formula. is a well-backed fintech scaling rapidly, seeking a backend centric Senior Software Engineer to own design, architecture and delivery of core infrastructure. You’ll shape systems, mentor peers and drive high quality, scalable solutions.

Expect work across payment ecosystems, cloud-native services, and automated pipelines in a fast-paced environment. Central London office with equity and strong engineering culture.

Qualifications

• Experience with payments systems and high-volume transaction environments.
• Strong Typescript and Node.js experience as core development tech.
• Experience with AWS, Kubernetes, Terraform and cloud-native deployments.

Responsibilities

• Own design, architecture, and delivery of core backend infrastructure.
• Mentor other engineers and make autonomous decisions on complex problems.
• Collaborate with product and engineering teams to deliver scalable systems.

Skills

Payments systems

Typescript & Node.js

AWS

Kubernetes

Terraform

Event-driven architecture

REST APIs

System design

Testing & security

AI tool fluency

CD/CI pipelines

Tools

AWS

Kubernetes

Terraform

Job description

We're working a well-backed, product-led fintech that's scaling fast and building genuinely disruptive technology in a market ripe for change. With strong technical foundations, a high bar for engineering quality, and a product that solves a real problem at real scale - they're looking to add a backend centric Senior Software Engineer to their growing function.

You'll be a key contributor across backend systems - owning design, architecture, and delivery of core infrastructure. You'll collaborate closely with product, mentor other engineers, and be trusted to make autonomous calls on complex, ambiguous problems.

What we need to see from a Senior Software Engineer:

• Experience with payments systems & high-volume transaction environments: Ideally within fintech or financial services, though strong eCommerce/Consumer/Gaming payments infrastructure experience will also be considered
• Strong Typescript & Node.js experience - this is the core of how the team builds
• AWS cloud infrastructure, containerised deployments (Kubernetes), and Infrastructure as Code (Terraform)
• Event-driven, distributed architecture and publicly accessible REST APIs
• System design, scalable architecture, and product problem-solving
• Testing philosophy, quality standards, and security within distributed systems
• AI tool fluency - this is an active part of how the team works
• Continuous delivery and fully automated deployment pipelines

The Package:

• Salary up to £120,000
• Equity
• Central London office

** Unfortunately due to a high number of applications, not all applicants will receive feedback.