Senior Site Reliability Engineer (SRE)

Job Description

Role: Senior Site Reliability Engineer (SRE) – Kubernetes / OpenShift

Location: Remote -UK (possible paid occasional travel to TIG Secure site locations as required)

Job Type: Full-time, Permanent (37.5 hours)

Salary: Competitive + benefits + package

Security Clearance Requirements

Please note that holding a current Security Clearance is not essential at the time of application, but eligibility is required.

This role requires the successful candidate to be eligible for Security Check (SC) clearance. To meet this requirement, applicants must:

• Have the right to work in the UK
• Have lived in the UK continuously for the past 5 years
• Not have spent more than 6 months outside the UK in total during that period
• Be willing to undergo security vetting as part of the onboarding process

About Us

Come and be a part of The Investigo Group (TIG), a dynamic coalition of cutting-edge tech firms specialising in Platform, Software, Data, AI and other bleeding-edge technology solutions. Our innovative prowess spans the globe while proudly hailing from the United Kingdom.

The group is multi-functional with a large portfolio of B2B products and services.

Our ecosystem is made up of:

Voixtel, secure communications and voice platforms for regulated and critical environments.

IIS, Providing secure internet access in both the public and private sectors. Its mission? To deliver world-class secure internet capabilities enhancing productivity across diverse skillsets and organisations.

Vestigo Consulting is our training and consultancy company, tailored around specialist sector-specific knowledge, and provides regular courses and CPD for our community. The Consultancy side concentrates on expert support of our customers as well as specifically assigned individual deployments.

Collaboraite is a bleeding-edge company that provides our Data and AI capability. A collaborative partner for designing user-centred secure data solutions to overcome operational hurdles, delivered through design thinking and agile coaching.

The group provides bespoke, secure, user-centric products fuelled by deep technical knowledge advanced data and analytical skills.

We proudly stand as a global leader in this space, partnering with esteemed entities that require these advanced forward-thinking capabilities. These partnerships have been forged from our understanding of customer challenges, as well as our expertise in developing world-leading enterprise product sets.

Join us at TIG, where innovation knows no bounds, and together, we'll shape the future of technology solutions for a safer, more efficient world.

Diversity, Equity, and Inclusion (DEI) are at the heart of The Investigo Group (TIG). We're dedicated to creating a workplace where people from all backgrounds are not only welcome but empowered to excel. We actively seek diverse talent, promote fairness, and foster an inclusive environment where every voice matters, driving innovation and progress in our dynamic tech community.

About You

You’re an experienced SRE, Platform Engineer or Cloud Engineer with strong hands-on experience running Kubernetes in production environments.

You’re comfortable working across Linux, Kubernetes, cloud-native tooling, automation, observability, CI/CD and infrastructure as code. You understand that reliability, security and operational maturity are critical to how modern platforms support engineering teams and customer-facing services.

You enjoy treating infrastructure as a product, automating repeatable work, improving resilience, and building platforms that other engineers can rely on. You’re calm under pressure, methodical during incidents, and able to turn operational challenges into long-term improvements.

You may have worked in a regulated, secure, government, defence, financial services, telecoms, managed services or cloud-native environment, but most importantly you have operated Kubernetes at depth and understand the realities of production ownership.

You’re a senior individual contributor who can mentor others, influence engineering practice, and provide technical authority without needing formal line management responsibility.

About the Role

We’re looking for a Senior Site Reliability Engineer (SRE) to help operate, harden and mature our production OKD / Kubernetes platforms.

This is a hands-on engineering role focused on reliability, automation, observability, GitOps, CI/CD and secure platform operations. You’ll work across the full stack, from bare-metal and virtualisation through to Kubernetes control plane operations, ingress, identity, monitoring, developer platform tooling and application delivery.

The role will play a key part in improving the operational maturity of our platform estate, supporting the migration from VMware to KVM, strengthening GitOps and CI/CD practices, and helping ensure our platforms remain secure, scalable and aligned to the needs of regulated customer environments.

You’ll work closely with platform, application, AI, networking, security, QA and architecture teams to build reliable foundations that enable other engineering teams to deliver safely and at pace.

This is not a ticket-handling role. It is a senior engineering position where you’ll be expected to own problems, drive improvements, and help shape how TIG operates critical cloud-native infrastructure.

About the Team

You’ll be joining our Cloud team, working closely with Platform Engineering and wider engineering teams responsible for the foundational platforms on which TIG’s services run.

This is a great opportunity to join a small, senior technical environment where you can have direct ownership, meaningful influence, and visibility across modern platform engineering, Kubernetes, automation, observability, security and cloud-native delivery.

Key Responsibilities

• Operate, harden and extend production OpenShift / OKD / Kubernetes clusters across on-premises and hybrid environments.
• Support the migration from VMware to KVM, helping modernise the underlying compute and storage layer.
• Own and improve CI/CD processes across the full lifecycle of platform and application components.
• Work with platform and application engineers to support cloud-native delivery using tools such as Helm and Kustomize.
• Develop and mature GitOps deployment practices using tools such as Argo CD or Flux.
• Maintain and improve core platform services including identity, ingress, observability, certificate management, service mesh and container registry capabilities.
• Build and operate observability across logs, metrics, traces, alerting, SLOs and error budgets.
• Improve platform hardening in line with secure and regulated environment requirements, including network policy, SELinux, image provenance, secret management and audit.
• Automate repeatable operational tasks using tools such as Ansible, Terraform, Helm, Kustomize, Go, Python or equivalent technologies.
• Lead incident response activity, support blameless post-mortems and drive systemic fixes.
• Partner with networking and security teams on platform integration, segmentation, load balancing and accreditation evidence.
• Create and maintain clear technical documentation, runbooks, design notes and operational guidance.
• Mentor other engineers and act as a senior technical authority across cloud and Kubernetes operations.
• Participate in an on-call rota, with appropriate compensation.

Success in This Role Looks Like

• A more reliable, secure and measurable production Kubernetes estate.
• Improved platform observability, with meaningful alerting, SLOs and trend data that engineering teams actively use.
• Progress against the VMware to KVM migration, with a clear and automated path for the underlying infrastructure layer.
• A mature GitOps approach covering platform and application components, including rollback, drift detection and operational control.
• Improved CI/CD practices that help teams move at pace while considering security, QA and compliance earlier in the lifecycle.
• Well-documented, supportable and scalable platform services.
• Stronger incident response, clearer runbooks and post-mortems that lead to real operational improvements.
• Recognition as a technical authority for Kubernetes, cloud and platform operations across the organisation.

Requirements

What We’re Looking For

We’re looking for a Senior Site Reliability Engineer (SRE) with strong experience operating production Kubernetes environments.

This role is well suited to someone who combines deep technical capability with strong operational discipline. You’ll be comfortable taking ownership of complex platform challenges, improving reliability, and working collaboratively across engineering, security, networking and architecture teams.

Essential Experience & Skills

• Strong experience running production Kubernetes environments, not just consuming or deploying into them.
• Strong Linux fundamentals, including systemd, networking, storage and performance troubleshooting.
• Experience with at least one Kubernetes distribution such as OKD, OpenShift, vanilla Kubernetes, Rancher, EKS, AKS or GKE.
• Solid infrastructure as code experience, including Ansible plus Terraform or equivalent, alongside tools such as Helm and Kustomize.
• GitOps and CI/CD experience managing full application and component lifecycles, using tools such as Argo CD, Flux, GitHub Actions or similar.
• Prometheus, Grafana, Elastic Stack / LGTM, OpenTelemetry or similar.
• Experience working with identity and access technologies such as OIDC, SAML, SCIM or Keycloak.
• Experience with virtualisation or infrastructure platforms such as KVM, libvirt or VMware.
• Scripting or tooling experience using Go, Python, shell scripting or similar.
• Strong troubleshooting, problem-solving and analytical skills.
• Experience working in secure, regulated or enterprise-scale environments.
• Strong communication skills, with the ability to produce clear documentation, runbooks, post-mortems and technical guidance.
• Eligible to hold UK SC clearance.

Desirable (Not Essential)

• Specific OpenShift or OKD experience, including operators, MachineConfig or SCCs.
• Service mesh experience such as Istio or Linkerd.
• Policy engine experience such as OPA, Gatekeeper or Kyverno.
• Cloud-native application deployment experience using Helm, Terraform, Kustomize or similar.
• Storage experience such as Ceph, Longhorn, OpenShift Data Foundation or equivalent.
• Networking experience including BGP, VXLAN, Palo Alto or Juniper technologies.
• Software supply chain security experience, including SBOMs, image signing, admission control or tools such as Sigstore.
• Experience operating AI, ML or GPU-enabled platforms.
• CKA, CKAD, CKS, Red Hat certifications or equivalent.
• Active or recent UK SC clearance.
• Recognised open-source contributions to the Kubernetes ecosystem.

Soft Skills & Behaviours

• Calm, structured and methodical under pressure.
• Strong written and verbal communication skills.
• Collaborative working style across platform, development, QA, security, networking and architecture teams.
• Strong sense of ownership and accountability.
• Automation-first mindset, with a focus on removing repeatable manual work.
• Able to influence technical practice through evidence, example and credibility.
• Pragmatic and solutions-focused approach to problem solving.
• Curious about why systems fail, not just how to bring them back online.
• Comfortable mentoring others and raising the technical capability of those around them.
• Able to balance reliability, delivery pace, security and compliance in a regulated environment.

Benefits

• Private Medical
• Health Cash Plan
• 4x Life Assurance
• Inclusive Culture: Enjoy an inclusive culture and environment.
• Holiday: Generous holiday allowance.
• Learning: Access to continuous learning and development opportunities.
• Bonus Potential: Bonus potential based on performance and business-related factors.
• Discounts: Discounts on a wide range of products and services.
• Pension: Pension scheme contributions.
• EV Car Scheme
• Regular Pay Reviews
• More Benefits: Explore additional benefits on our career site.

Equal Opportunities

Here at TIG we are committed to equal opportunities and value diversity, equity and inclusion at our company. We do not discriminate based on race, religion, colour, national origin, sex, gender, gender expression, sexual orientation, age, marital status, veteran status, or disability status.

As a Group, we seek to ensure that individuals with disabilities receive reasonable accommodation throughout the hiring process and ultimately within the job itself. Please contact us to request any accommodations.