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Senior Software Engineer II

Runna London💼 Full-time💰 $85,000–$95,000🗓 2026-04-13 → 2026-09-26

Core

Full-stack engineer building the training engine and app features for millions of runners, integrating AI/ML tooling and adapting plans.

Role type

Senior Software Engineer II (Full-stack)

Builds

Mobile app features, training engine integrations, and backend services for iOS/Android

Domain

Fitness technology / Mobile applications

Deliverable

product features

Required skills

TypeScript, JavaScript, React Native, AWS, Full-stack development, System design, CI/CD pipeline management, Code review and mentorship

Preferred skills

SwiftUI, Serverless architectures, Infrastructure as Code (Terraform/CDK), Open source contributions

Technologies

React Native, TypeScript, GraphQL, Apollo Client, AWS (Lambda, AppSync, DynamoDB, S3, SQS, SNS, EventBridge, SageMaker), Snowflake, Fastlane, Maestro, GitHub Actions

Responsibilities

Architecting and delivering full-stack features, collaborating with AI/ML engineers on training engine interfaces, maintaining developer tooling and CI/CD, leading release processes, mentoring team members

Seniority

Senior, hands-on IC

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