Senior Engineer- Platform Engineering

Requisition
31464
-Posted
- London

- Janus Henderson

A career at Janus Henderson is more than a job, it’s about investing in a brighter future together.

Our Mission at Janus Henderson is to help clients define and achieve superior financial outcomes through differentiated insights, disciplined investments, and world‑class service. We will do this by protecting and growing our core business, amplifying our strengths and diversifying where we have the right.

Our Values are key to driving our success, and are at the heart of everything we do:

Clients Come First - Always | Execution Supersedes Intention | Together We Win | Diversity Improves Results | Truth Builds Trust

If our mission, values, and purpose align with your own, we would love to hear from you!

As a Senior Engineer within Platform Engineering, you will lead the design, build, and evolution of our Internal Developer Platform (IDP), enabling consistent, secure, and scalable software delivery across the enterprise. This role combines Dev Ops engineering, platform architecture, and developer experience enablement, with a strong focus on CI/CD transformation (Azure Dev Ops to Git Hub), platform tooling, and data platform integration (Snowflake, Databricks).

You will act as a subject matter expert (SME) across Dev Ops tooling, automation, and platform reliability—driving best practices, standardisation, and self‑service capabilities for engineering teams.

• Design, build, and evolve enterprise platform services to support the Internal Developer Platform (IDP) and enable scalable, secure, and self‑service engineering environments.
• Lead Dev Ops transformation initiatives, including migration from Azure Dev Ops to Git Hub, and implement standardised CI/CD pipelines, reusable workflows, and release automation frameworks.
• Develop and maintain Infrastructure‑as‑Code (IaC) solutions using Terraform, Bicep, or similar tools to provision and manage cloud infrastructure.
• Deliver and optimise cloud‑native platforms on Azure (primary), ensuring scalability, resilience, and cost efficiency.
• Act as SME across Dev Ops tooling, including Git Hub (Actions, Advanced Security), Nexus (artifact management), and Veracode (application security), embedding security controls into pipelines and platform services.
• Enable and support Dev Ops practices for core data platforms, including Snowflake and Databricks, covering environment provisioning, CI/CD integration, and access control models.
• Implement observability frameworks, including monitoring, logging, and alerting, and contribute to SRE practices such as SLIs/SLOs, reliability engineering, and incident management.
• Embed security and compliance standards into all platform components, ensuring auditability, policy enforcement, and alignment with enterprise governance requirements.
• Drive developer experience improvements through platform standardisation, self‑service tooling, templates, and AI‑enabled capabilities (e.g., Copilot, intelligent automation).
• Collaborate with Architecture, Cloud COE, SRE, and engineering teams to deliver consistent and governed platform capabilities across the organisation.
• Mentor junior engineers and contribute to technical leadership, standards definition, and engineering best practices.

• Hybrid working and reasonable accommodations
• Excellent Health and Wellbeing benefits including corporate membership to Wellhub
• Paid volunteer time to step away from your desk and into the community
• Support to grow through professional development courses, tuition/qualification reimbursement and more
• Maternal/paternal leave benefits and family services
• All employee events including networking opportunities and social activities
• Lunch allowance for use within our subsidised onsite canteen

• Bachelor’s or master’s in computer science, Engineering, or related field
• 6+ years of experience in platform engineering, Dev Ops, or infrastructure roles
• Strong experience with cloud platforms (Azure preferred)
• Proficiency in containerisation (Docker, Kubernetes)
• Hands‑on with CI/CD tools (Git Hub, Azure Dev Ops, Git Lab CI)
• Experience with IaC tools (Terraform, Pulumi, Ansible)
• St…