Principal Software Engineer
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Looking for a software engineer job in London? Choose from 163 open roles at 61 employers. Explore real salary data and skills breakdown across remote, hybrid and on-site roles.
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The work spans several distinct areas. At the infrastructure and ML end, roles like Software Engineer, Model Inference at DeepMind and Senior Software Engineer, Inference Platform at Isomorphic Labs involve designing and operating systems that serve large machine learning models in production, often requiring deep familiarity with hardware accelerators and serving frameworks. At the product and platform end, roles such as Software Engineer Intern at Stripe and Software Engineer New Grad at Stripe focus on full-stack development across multiple languages, building financial infrastructure at scale. Customer-facing engineering appears too, as in the Senior Software Engineer at Microsoft, where the work involves embedding within client teams to deliver cloud and AI solutions. Across the sample, common threads include writing production code, designing APIs, participating in code reviews, and collaborating with cross-functional teams. AI and agent-related work features prominently in a number of postings, though many roles remain general-purpose backend or platform engineering.
The skills table reflects mentions across all postings on this page, not hard requirements — a skill named in a job description may be context rather than a gate. With this sample size, the counts suggest APIs and Python are broadly relevant, while C++, Kubernetes, and React each appear in roughly a quarter to a third of postings. LLMs and agents feature in a meaningful minority, pointing to an AI-adjacent thread running through several roles but not dominating the whole set.
The employers' own advertised ranges, for individual roles at different levels — not an average and not a market rate.
Most postings on this page are listed as onsite, with a substantial minority specifying hybrid arrangements. A small number explicitly offer remote working. None are listed with unknown work mode, so the split is relatively clear for these postings. That said, hybrid and onsite terms are defined by each employer individually — what counts as hybrid at one company may differ significantly from another's arrangement — so it is worth checking the individual posting for expected days in office before applying.
Jobs checked 12 seconds ago. · Guide reviewed 14 September 2026.
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