Unix Engineer

Whitehall Resources require a Unix Engineer to work with a key client on a 6 month contract. *This role will require on site work in London 3 days per week., We are seeking a highly capable Senior SI-UNIX Engineer to support and evolve a critical Specialised Infrastructure estate within a regulated financial services environment. This role is designed for hands-on engineers who operate at the intersection of Unix/Linux systems engineering and high-performance infrastructure. You will play a key role in both run (L2/L3 support) and change (migration, optimisation, transformation) activities, working within a structured, highly governed enterprise environment. Key Responsibilities Specialised Infrastructure Engineering

• Design, build, configure, and optimise Unix/Linux systems supporting high-performance or low-latency workloads

• Support infrastructure aligned to market data platforms, real-time processing, or grid/HPC environments

• Work with high-performance networking technologies and infrastructure components, including exposure to accelerator ecosystems (e.g. Mellanox or similar)

• Continuously improve platform performance, stability, and scalability Production Support & Operations

• Provide L2/L3 support for critical production systems, ensuring high availability and rapid incident resolution

• Perform deep technical troubleshooting and root cause analysis across complex system environments

• Support systems operating under strict SLAs and uptime requirements Security, Hardening & Compliance

• Implement and maintain secure build standards, OS hardening, and patching processes

• Manage access controls (e.g. sudo, PAM, RBAC) and address vulnerabilities in line with enterprise policies

• Support audit, risk, and compliance activities within a regulated banking environment Transformation & Change Delivery

• Contribute to data centre migrations, infrastructure modernisation, and platform stabilisation initiatives

• Support performance optimisation programmes for existing and new workloads

• Work closely with engineering and delivery teams on system improvements and architectural evolution (while remaining hands-on) Operational Governance

• Operate within an ITIL-aligned framework, including incident, problem, and change management

• Maintain strong documentation, operational standards, and audit readiness

• Collaborate effectively with global teams and stakeholders

Core Technical Capabilities (Baseline)

• Strong experience with enterprise Unix/Linux platforms, including:

• Linux distributions (RHEL, Oracle, SUSE)

• Unix variants (AIX, Solaris, HP-UX)

• Proven experience providing L2/L3 production support in large-scale environments

• Deep command-line proficiency and hands-on system configuration experience Strong understanding of:

• System performance tuning

• OS patching and lifecycle management

• Monitoring and troubleshooting tools Security & Regulatory Awareness

• Experience in regulated environments (e.g. financial services, banking) Practical exposure to:

• OS hardening and vulnerability remediation

• Access management frameworks

• Audit and compliance processes

• Critical Differentiators (Essential for Success) Specialised Infrastructure Expertise

• Experience working in low-latency, high-performance, or market data environments Exposure to:

• High-performance computing (HPC) or grid computing frameworks

• Real-time or latency-sensitive systems

• Demonstrated ability to support performance-critical workloads Hardware & Performance Awareness

• Understanding of high-performance networking and infrastructure acceleration Exposure to technologies such as:

• Mellanox, Solarflare, or equivalent ecosystems

• Offload engines, FPGA, or similar accelerator technologies (desirable) Hands-On Engineering Focus

• Strong preference for candidates who are actively hands-on, configuring, troubleshooting, and optimising systems

• Ability to demonstrate technical depth through real-world engineering experience All of our opportunities require that applicants are eligible to work in the specified country/location, unless otherwise stated in the job description. Whitehall Resources are an equal opportunities employer who value a diverse and inclusive working environment. All qualified applicants will receive consideration for employment without regard to race, religion, gender identity or expression, sexual orientation, national origin, pregnancy, disability, age, veteran status, or other characteristics.