Principal Software Engineer – 3 month contract

Company: Collinson
Apply for the Principal Software Engineer – 3 month contract
Location: London
Job Description:

This is a contract role for 3 months, starting in May ideally.

We are now looking for a visionary Principal Engineer to help define the next generation of our platform.

Why this role matters:

This is more than a leadership position. It’s an opportunity to influence the architecture, scalability, and future direction of a truly global technology ecosystem.

You’ll lead the technical vision for one of the most critical pillars in our Engineering organisation, our API platform, driving innovation across synchronous and asynchronous services built with REST, GraphQL, Kafka, and cloud-native technologies.

You’ll work hands-on with modern engineering tools and practices, partnering with talented squads to solve complex distributed systems challenges at scale. From AI-driven engineering initiatives to highly observable event-driven architectures, this is a role for someone who thrives on building exceptional systems and empowering exceptional teams.

What you will be doing:

  • Defining the architectural vision for our API ecosystem
  • Leading the design and development of scalable, cloud-native distributed systems
  • Building high-throughput event-driven services using Kafka
  • Driving engineering excellence across security, observability, performance, and maintainability
  • Mentoring and coaching engineers and technical leaders across multiple squads
  • Collaborating closely with Product, Delivery, and Engineering leadership to shape strategic technical decisions
  • Championing modern development practices including TDD, CI/CD, Infrastructure as Code, and automated testing
  • Exploring and embedding AI-powered engineering capabilities into our workflows and platform

Our technology stack:

You’ll be working with a modern, forward-thinking stack including:

  • TypeScript (Node.js & React)
  • AWS (EKS, Lambda, Aurora RDS)
  • Kubernetes
  • GraphQL & REST APIs
  • Kafka
  • Terraform & Helm
  • GitHub Actions
  • DataDog
  • Salesforce integrations

What we are looking for:

You’re a technically exceptional engineering leader who still loves being close to the code.

What you bring:

  • Proven experience architecting large-scale distributed systems in the cloud
  • Deep expertise in APIs, event-driven architectures, and containerised applications
  • Strong knowledge of AWS and modern DevOps practices
  • Experience leading engineering teams and influencing technical direction across squads
  • A passion for software craftsmanship, clean architecture, and scalable design
  • A mentoring mindset and a collaborative leadership style
  • Curiosity around AI and emerging engineering technologies

Experience with Salesforce or enterprise CRM ecosystems is a strong advantage.

What Collinson Offers:

  • Flexible and hybrid working options
  • Work from anywhere – 8 weeks a year
  • Generous parental leave and family-friendly policies
  • Career development, mentorship, and training
  • A supportive, inclusive culture with employee resource groups and diversity initiatives.

Equal Opportunity Statement:

Collinson is an equal opportunity employer and welcomes differences in all their forms including colour, race, ethnicity, gender identity, sexual orientation, neurodivergence, family status, age, individuals with disabilities and people from all backgrounds, cultures and experiences as we strongly believe this contributes to our on-going success.

Company Values:

We are focused on continually evolving our purpose driven, high performing culture, providing an environment where our people have the opportunity to achieve their full potential and do interesting and meaningful work. Our company values are: Take Action, Do the right thing, One team and Be insight led. These help guide everything we do internally in terms of how we think, act and interact, right through to how we deliver value to our customers and clients.

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Posted: May 3rd, 2026