Senior DevOps Engineer (AWS) (UK working hours)

On behalf of our Client from the UK, Mobilunity is looking for a skilled, EU-based senior DevOps Engineer.

Our Client is an eCommerce expert with a proven track record in rail ticketing, web and mobile software development. They focus on public transport software products. The company started at the end of 2014 with five people and has since grown to over 20 members of staff, more than half of which are developers. The company now serves a long list of clients including Southern, Southeastern, Thameslink, Great Northern, and Gatwick Express railway.

Responsibilities:

Build and run our multi-account AWS infrastructure as code with Terraform, and bring the parts still configured manually in the AWS console into Terraform

Run and improve our primary container platform on Amazon ECS, and support the services that still run on other container orchestration platforms

Raise the standard of CI/CD across our repositories: shared GitHub Actions workflows, guardrails and tooling that make every team’s releases safe, repeatable and fast

Build and look after the on-demand environments our developers use to run the full platform

Improve monitoring, logging and alerting, and help resolve production issues

Keep the platform secure and compliant, including access control, backups and evidence for our security and quality assurance standards

Make infrastructure decisions with their running cost in mind

Work closely with our developers, and document what you build so others can run it

Take part in a shared on-call rota, roughly once every four to six weeks

Requirements:

6+ years running production systems in a DevOps, platform engineering, SRE, infrastructure architecture or similar role

Hands-on AWS experience: comfortable with the baseline services anyone who has run

AWS will know, such as VPC networking, IAM, S3, CloudWatch and Secrets Manager, and ideally with ECS, RDS and WAF

Experience with infrastructure as code, such as Terraform or OpenTofu, CloudFormation or CDK, Ansible or an equivalent

Hands-on experience building and running containers with Docker or Podman

Confident with Linux and scripting, ideally Python and Bash

CI/CD pipelines you have built and owned, ideally in GitHub Actions

A working grasp of networking: DNS, TLS, load balancing and routing

Excellent written and verbal communication skills in English, including explaining technical trade-offs to non-technical colleagues

A methodical approach: you check and measure before you conclude, and you write down what you find

Comfortable using AI assistants such as Claude, ChatGPT, Copilot or Gemini in everyday engineering work

Level of English – Upper-Intermediate and higher

Experience with IaC and infrastructure platform development

Experience with audited or regulated environments and ISO standards

Nice to have:

Operational experience with container orchestration: Amazon ECS or an equivalent such as Kubernetes (EKS, OpenShift)

Running a message broker such as RabbitMQ, SQS or Kafka, or an equivalent like Azure Service Bus or Google Cloud Pub/Sub

Running relational databases such as MySQL or PostgreSQL, including managed services like Amazon RDS, Azure Database for MySQL or PostgreSQL, or Google Cloud SQL

AWS WAF

Supporting a security or quality standards audit

Familiarity with security standards such as OWASP, PCI DSS and ISO 27001

Rail, travel or e-commerce experience

Software development experience in Python, Node.js/TypeScript or Scala

AWS certifications, such as Solutions Architect (Associate or Professional), CloudOps Engineer – Associate, Developer – Associate, DevOps Engineer – Professional or Security – Specialty

Experience with incident response or supporting production systems under a Service Level Agreement (SLA)

Experience working in an Agile team

Working hours - Monday–Friday, generally available and contactable from 9:00 to 17:00 UK time

On-call - One week approximately every 4–6 weeks

Background check is required as part of the hiring process.