Principal API & Platform Engineer - Remote UK

AlphaSense; United Kingdom; On-site; GBP 120,000 - 180,000; Full time

Job summary

AlphaSense is seeking a Principal Software Engineer to define and build shared, API-first product platforms that power multiple product surfaces, integrations, and agentic workflows. The role sits at the intersection of hands-on engineering and cross-product technical leadership, focusing on scalable APIs and maintainable contracts.

You will stay close to the code while shaping platform design, evolution, and adoption across the company, working across teams to align long-term technical

Qualifications

• Senior staff/principal-level software engineer with production-grade systems.
• Experience building product platforms or shared services used by multiple product teams.
• Proven track record designing, building, and operating APIs at scale.
• Strong hands-on contribution and ownership of real systems.
• Ability to influence technical direction across teams through credibility and execution.

Responsibilities

• Act as a technical owner and force multiplier for API-first architecture across the company.
• Design, build, and evolve high-scale APIs used by internal teams, external customers, and intelligent agents.
• Lead the development of agentic workflows, including orchestration, state management, tooling, and integration patterns.
• Drive API standards, design principles, and best practices through hands-on work and technical reviews.
• Tackle complex cross-team problems where requirements are ambiguous and constraints are real.
• Partner with Product, Platform, and SRE teams to ensure APIs are reliable, observable, secure, and scalable.
• Identify and reduce systemic technical risks while enabling teams to move faster.
• Mentor senior engineers and raise the technical bar through example, not hierarchy.

Skills

API design

System design

Hands-on coding

Cross-team influence

Technical leadership

Tools

REST APIs

GraphQL

Job description

AlphaSense is seeking a Principal Software Engineer to define and build shared, API-first product platforms that power multiple product surfaces, integrations, and agentic workflows. The role sits at the intersection of hands-on engineering and cross-product technical leadership, focusing on scalable APIs and maintainable contracts.

You will stay close to the code while shaping platform design, evolution, and adoption across the company, working across teams to align long-term technical