Principal Software Engineer

Principal Software Engineer

We are looking for a highly experienced Principal Software Engineer with strong backend engineering expertise and a passion for scalable distributed systems. You will play a key role in shaping architecture, engineering standards, and technical direction across the platform.

Join a fast-growing Banking SaaS provider building next generation core banking technology.

We are looking for Principal Software Engineers with experience in Node.js / Type Script / JavaScript, .NET / C#, or Java.

You will work directly on customer problems, understand the business context and own solutions end-to-end. From concept and design through to development, release, monitoring and operational support.

You will join a team building a modern, scalable core banking platform. This requires intellectual curiosity, discipline, and deep architectural thinking to build technology capable of evolving alongside regulatory and technological change.

Location: Remote-first but UK-based for essential company events.
Travel to London will be required on a quarterly basis for team meetings, with 2 company wide annual meetings offsite.

Salary
: £100,000 To £120,000 (Based on Experience) plus Benefits including 25 days holiday + bank holidays, Family Health Insurance, Life Insurance, Regular social events

• The environment is primarily Node.js and Go but strong engineers from .NET/C# or Java backgrounds are encouraged to apply.
• Integrating with payment platforms, banking infrastructure, FX/crypto providers, and card processors
• Driving architectural decisions across distributed systems and cloud infrastructure
• Leading technical design reviews and influencing engineering best practices
• Mentoring engineers and helping scale a high-performing engineering culture
• Designing and optimising SQL and No
  
  SQL data models
• Developing APIs, asynchronous workflows, and event-streaming pipelines
• Deploying secure, high availability services across AWS, GCP, and Azure

We heavily utilise agentic coding and AI-assisted development workflows, including Claude Code, to accelerate engineering productivity

Principal Engineers play a key role in technical strategy, architecture governance and engineering direction

Engineers focus on solving complex technical and domain challenges rather than repetitive boilerplate development

Collaborative engineering culture with involvement in architecture, design discussions, and domain modelling

End-to-end ownership of features from development and testing through to deployment, monitoring, and production support

• Degree educated
• Development experience in either Node.js with JavaScript & Typescript, .NET, C# or Java
• AWS experience preferred (Azure, GCP also welcomed)
• Strong understanding of relational databases, ideally MySQL
• Interest in agentic engineering workflows and AI-assisted development
• Experience designing APIs and distributed systems
• Proven experience designing and scaling complex distributed systems
• Strong architectural leadership experience
• Experience mentoring or leading senior engineers/teams
• Ability to influence technical direction across multiple work streams
• Experience operating within high-scale or regulated environments

• Expertise in AWS Lambda, Fargate, SQS/SNS, Dynamo
  
  DB and cloud native architectures
• Client-facing experience
• Ideally experience within Fintech, Banking or enterprise SaaS

• Opportunity to shape the architecture of a next-generation banking platform
• High level of technical autonomy and influence
• Ability to help define engineering practices in an AI-assisted development environment
• Enjoy the freedom of remote-first work with regular in-person meetings.
• High trust, low bureaucracy and a culture of respect & accountability.
• Competitive salary, benefits, and a company that celebrates your success.

25 days holiday + bank holidays;
Family Health Insurance, Life Cover, EMI Share Options (you will share in their success), Remote working environment (quarterly meetings in London).