Senior Software Engineer - Login Platform

Salary: £55,000 - 95,000 per year

Requirements:

• Strong software engineering experience in C++, ideally building backend, infrastructure, platform, or systems-level software.
• Experience designing, building, or operating distributed backend systems, ideally in high-availability, low-latency, or infrastructure-heavy environments.
• Strong experience designing and building multi-threaded or concurrent applications.
• Experience owning software across the full lifecycle, including design, implementation, testing, deployment, observability, incident response, and long-term evolution.
• Ability to make pragmatic system design decisions across performance, scalability, reliability, maintainability, and compatibility constraints.
• An eagerness to understand a large, non-trivial stack and propose incremental improvements without compromising reliability or security.
• Strong communication and collaboration skills, with the ability to work effectively across Engineering, Product and platform-dependent teams.
• A degree in Computer Science, Engineering, Mathematics, a similar field of study, or equivalent work experience.
• Background in authentication, authorization, identity, access control, entitlement systems, SSO, MFA, session management, or security-sensitive infrastructure.
• Familiarity with systems that propagate authentication, authorization, entitlement, or security context across distributed services.
• A track record of building low-latency, reliable backend or infrastructure services.
• Hands-on involvement in improving observability, scalability, performance, reliability, or operational tooling for production systems.
• Exposure to platform teams that support multiple internal product or application teams.
• Experience working across multiple business units or products, with an understanding of their operational and integration challenges.

Responsibilities:

• Design, build, and optimize low-latency, multi-threaded backend systems that handle session and authorization data at scale.
• Collaborate with multiple Engineering and Product teams to deliver a reliable and secure login experience.
• Contribute to architectural decisions and long-term technical strategy for the Login Platform.
• Improve tooling, observability, scalability, and performance across critical infrastructure services.
• Explore and champion new ideas to evolve our systems responsibly over time.
• Work throughout the software lifecycle, including design, deployment, observability, incident response, and long-term platform evolution.

Technologies:

• AI
• AI Agents
• Backend
• Support
• Linux
• MCP
• Python
• Security
• Backbone
• C++
• CTO
• Mobile
• Web

More:

We are part of Login Platform within the Platform Security organization in London, operating deep in the infrastructure stack. Our teams own the framework that orchestrates session enrichment flows, while data-owning teams provide and manage the underlying datasets. Almost every business unit at Bloomberg depends on our platform to make authorization and access-control decisions, and our software is critical to maintaining reliability, compliance, and continued growth. We are evolving our session and authorization infrastructure to support AI agents, MCP-based integrations, and machine-to-machine workflows across Bloomberg systems. Our technologies are primarily C++ and Python on Linux, with continued support for Solaris clients until full migration is complete. We balance innovation with compatibility, designing modern, robust solutions that coexist with legacy systems. Bloomberg also invites candidates to discover more through its podcast series for an inside look at its culture, values, and people.

last updated 36 week of 2026