Senior Software Engineer, APIs & Platform

Expedia Group; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

Expedia Group in London is seeking a Software Development Engineer III within B2B to build scalable, high‑quality software that powers our global partner ecosystem. You will be a key technical contributor, mentor junior engineers, and lead complex engineering initiatives.

You will collaborate across teams to design robust APIs, apply software design principles, test and debug production systems, and contribute to the technical direction of our products.

Qualifications

• Bachelor's degree in CS, Engineering, or related field; or equivalent experience with 5+ years of software development
• Master's degree with 3+ years of software development
• Experience developing software in at least 3 languages
• Experience designing and building APIs for consumption across a business unit

Responsibilities

• Lead design, development, and delivery of complex systems and APIs across the unit
• Mentor junior engineers and lead code reviews
• Collaborate across the organization to coordinate cross-dependencies
• Design clean, modular, and well-tested software
• Test, debug, and resolve production issues within SLAs
• Identify inefficiencies in code or systems and propose improvements
• Contribute to a community of practice and share knowledge
• Present findings on major initiatives to stakeholders

Skills

Software development

API design

Programming languages

Team collaboration

Testing and monitoring

Education

Bachelor's degree in CS/Engineering

Master's degree in CS/Engineering

Tools

Testing tools

Monitoring tools

Job description

Expedia Group in London is seeking a Software Development Engineer III within B2B to build scalable, high‑quality software that powers our global partner ecosystem. You will be a key technical contributor, mentor junior engineers, and lead complex engineering initiatives.

You will collaborate across teams to design robust APIs, apply software design principles, test and debug production systems, and contribute to the technical direction of our products.