Senior Software Engineer – Personalisation

Jobtailor; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

Jobtailor in London is seeking a senior software engineer to design and operate large-scale identity services. You will own end-to-end features, from design to production, focusing on secure, scalable authentication and identity management.

You will help shape the Identity Platform's technical direction, balancing security, performance, and developer usability, while mentoring teams and driving engineering excellence across the organization.

Qualifications

• Senior software engineer with significant experience building and operating large-scale distributed systems serving millions of users.
• Strong experience with Java and/or Kotlin and modern backend development frameworks.
• Experience designing secure, scalable services in cloud-native environments.

Responsibilities

• Design, build, and evolve secure, scalable authentication and identity services used by millions of customers and colleagues.
• Own features end-to-end, including solution design, development, testing, deployment, monitoring, and production support.
• Shape the technical direction of the Identity Platform balancing customer experience, security, and performance.
• Develop resilient APIs and backend services enabling secure authentication, authorisation, and identity management.
• Champion engineering excellence through clean, maintainable, well-tested code and best practices.
• Participate in code reviews, technical discussions, pair programming, and knowledge-sharing initiatives.

Skills

Java

Kotlin

Cloud-Native Environments

DevOps Principles

Identity and Access Management

API Development

Distributed Systems

Tools

OAuth 2.0

OpenID Connect

Job description

Responsibilities

• Design, build, and evolve secure, scalable, and high-performance authentication and identity services used by millions of customers and colleagues.


• Own features end-to-end, taking responsibility for solution design, development, testing, deployment, monitoring, and production support.


• Help shape the technical direction of the Identity Platform, balancing customer experience, security, performance, and developer usability.


• Develop resilient APIs and backend services that enable secure authentication, authorisation, and identity management capabilities across the organisation.


• Champion engineering excellence through clean, maintainable, and well-tested code, helping establish best practices across teams.


• Actively participate in code reviews, technical discussions, pair programming, and knowledge-sharing initiatives.

Requirements

• A senior software engineer with significant experience building and operating large-scale distributed systems serving millions of users.


• Strong experience with Java and/or Kotlin and modern backend development frameworks.


• in designing and delivering secure, scalable services within cloud-native environments.


• Strong understanding of DevOps principles, CI/CD pipelines, automation, and operational ownership.


• Comfortable designing systems that balance security, usability, resilience, and performance.


• Experience with identity and access management technologies, OAuth 2.0, OpenID Connect, or similar authentication standards is highly desirable.

Core Competencies

Demonstrates expertise in designing and developing secure, scalable authentication and identity services, with a strong focus on clean code practices and operational ownership in cloud-native environments. Proficient in building resilient APIs and backend services while balancing security, usability, and performance.

Highest-signal resume keywords

• Java Development


• Kotlin Development


• Cloud-Native Environments


• DevOps Principles


• Identity and Access Management

ATS Optimization Keywords

Hard Skills

• Backend Development


• API Development


• Distributed Systems


• Authentication Standards


• OAuth 2.0


• OpenID Connect


• CI/CD Pipelines


• Automation


• Solution Design


• Testing

Soft Skills

• Collaboration


• Knowledge Sharing


• Code Review


• Technical Discussion


• Pair Programming

Industry Keywords

• Authentication


• Identity Management


• Security


• Performance


• Usability


• Resilience