Senior AWS Application & Platform Engineer at UST, London, £Contract Rate

Role description

Location: London (Hybrid – 3 days onsite, mandatory)

Employment Type: Permanent | Fixed-Term Contract | Contract (Inside IR35)

Start Date: Immediate/ Short Notice period

About the Role

We are seeking a Senior AWS Application & Platform Engineer to help design and build cloud-native applications, developer platforms and AI-enabled engineering capabilities from the ground up.

This is a highly hands-on engineering role combining AWS application development, serverless and event-driven architecture, Python, Generative AI, developer tooling and automation.

You will build APIs, reusable application patterns, developer accelerators and AI-enabled services that help engineering teams deliver software more efficiently, securely and consistently.

Key Responsibilities

• Design and build cloud-native applications, APIs and platform services on AWS.
• Develop serverless and event-driven solutions using AWS Lambda, API Gateway, Step Functions, EventBridge, SQS/SNS and related services.
• Build AI-enabled and Generative AI solutions using Amazon Bedrock and agentic AI technologies.
• Develop reusable application patterns, templates, quick-start solutions and developer tooling.
• Build Python-based automation, APIs and engineering services.
• Design and maintain CI/CD pipelines and Infrastructure as Code using technologies such as GitHub Actions, AWS CodePipeline, Terraform, CloudFormation or CDK.
• Develop internal developer tooling and self-service capabilities that improve engineering productivity.
• Embed security, governance, observability and automated testing into engineering solutions.
• Apply AI-assisted development practices to improve software engineering and developer workflows.
• Collaborate with engineering, platform, security and operations teams to deliver secure, scalable and well-documented solutions.
• Mentor engineers and promote engineering best practices and reusable development patterns.

Essential Skills & Experience

• Strong software engineering and application development background.
• Extensive hands-on experience developing solutions on AWS.
• Strong Python development experience.
• Experience creating reusable development patterns, engineering tooling, or developer accelerators.
• Hands-on experience with Amazon Bedrock, Generative AI or AI-native application development.
• Exposure to agentic AI applications, AI assistants or AI-enabled engineering workflows.
• Experience using AI coding assistants / AI-assisted development practices.
• Strong experience with AWS serverless and event-driven technologies, particularly: AWS Lambda, API Gateway, Step Functions, EventBridge, SQS/SNS, DynamoDB, S3
• Experience designing and building cloud-native APIs and backend services.
• Strong CI/CD and DevOps automation experience using tools such as GitHub Actions, AWS CodePipeline/CodeBuild, GitLab CI/CD or Jenkins.
• Strong Infrastructure as Code experience using Terraform, CloudFormation and/or AWS CDK.
• Experience with Docker and container platforms such as ECS/EKS or Kubernetes.
• Good understanding of API design, automated testing, observability, and secure-by-design engineering.
• Strong stakeholder collaboration and communication skills.

Desirable Skills

• FastAPI or Django / Python API framework experience.
• Internal Developer Platform or Developer Experience (DevEx) engineering.
• Experience building AI platforms or AI-enabled developer services.
• GitOps and policy-as-code experience.
• Amazon Q, Kiro or equivalent AI-assisted engineering tools.
• Experience working within Financial Services or another regulated environment.
• Knowledge of AI governance, responsible AI and auditability.

Interested? Apply for an immediate discussion with our Talent Team

#UST

Skills

AWS Bedrock, Lambda ,API Gateway ,Step Functions , EventBridge ,GitHub Actions Python ,FastAPI , TypeScript ,Agentic AI ,Developer Platforms ,CI/CD , Infrastructure as Code

About UST
UST is a global digital transformation solutions provider. For more than 20 years, UST has worked side by side with the world’s best companies to make a real impact through transformation. Powered by technology, inspired by people and led by purpose, UST partners with their clients from design to operation. With deep domain expertise and a future-proof philosophy, UST embeds innovation and agility into their clients’ organizations. With over 30,000 employees in 30 countries, UST builds for boundless impact—touching billions of lives in the process.