Senior Site Reliability Engineer

As a Site Reliability Engineer, you ll play a key role in designing, building, and maintaining resilient systems that support critical operations. You ll work closely with cross-functional teams to ensure our platforms are scalable, secure, and reliable. This is a hands-on role where you ll have the opportunity to influence technical direction, improve system performance, and contribute to meaningful projects., * Designing and maintaining reliable, scalable physical and virtual infrastructure

• Monitoring system performance and proactively resolving issues
• Automating processes using tools such as Ansible to improve efficiency and consistency
• Collaborating with engineers and stakeholders across the business
• Supporting continuous improvement of systems, tools, and practices
• Operating across the full infrastructure stack, from bare metal systems through to virtualised deployments and the applications running within them.

• Experience in Site Reliability Engineering, DevOps, or similar roles
• Strong knowledge of cloud platforms (e.g. AWS, Azure, or GCP)
• Experience with infrastructure as code and configuration management tools (e.g. Terraform, Ansible)
• Familiarity with CI/CD pipelines and automation practices
• Understanding of monitoring, logging, and alerting systems
• A collaborative mindset and a passion for problem-solving

We re committed to building a diverse and inclusive workplace. We welcome applications from people of all backgrounds, experiences, and identities.

If you need any adjustments during the recruitment process, please let us know. We re here to support you

Further Information:

Due to the nature of the work and the sectors we support, any offer of employment will be subject to the successful completion of the relevant security screening and clearance process.

This role requires eligibility for BPSS / SC / DV clearance. As part of the vetting process, candidates must meet the UK Government’s residency and right-to-work requirements associated with the required level of clearance.

• Competitive salary and benefits package of £75,000 to £95,000 P.A. depending on experience
• 28 days holiday plus bank holidays, with the option to buy or sell an additional week
• Annual bonus, 8% non-contributory pension and private healthcare and life insurance
• Flexible working and enhanced parental leave
• Opportunities for learning, development, and career progression
• Supportive and inclusive team environment and the chance to work on meaningful projects
• Fully remote until our Bristol office is completed (expected early 2027), then moving to a hybrid model of 3 days onsite in Bristol and 2 days working from home with occasional expensed travel to Herefordshire and Corsham.
• Eligible for SC and/or DV Clearance

TwinStream was formed to bring together their collective expertise and experience into a single business, focused on delivering technical excellence and high-quality service to clients.

In 2019, the founders were working as engineers solving complex cross-domain problems within government organisations. Since then, the company has grown to over 100 team members across the UK, with colleagues working both on-site with clients, hybrid and remotely from home.