GCS

About the Company

For over 30 years, GCS has been at the forefront of digital transformation, building vast global communities of innovators and placing them in businesses shaping tomorrow's world. Whether it’s the next step on your journey or if you are looking for an industry luminary, we are your partner of choice.

Proud of our specialist service and passionate about our people, our customers only deal with true industry experts. Whether you are looking to add to your team or find a new contract or permanent position, GCS will ensure you find the best possible match for your requirements.

Dedicated to recruitment excellence since 1991, we have a proven track record of supplying effective and efficient recruitment solutions, gaining us a reputation for working with talent in the Technology and Commercial sectors. From offices in 10 different locations around the world including London, Dublin, Reading, Manchester, Milton Keynes, New York, and Austin, our market-specialist consultants provide a service that is trusted and relied upon by businesses across the UK, Ireland, and beyond.

In May 2017, GCS was acquired by nGAGE Specialist Recruitment, a UK-based recruitment group which supports, steers and brings together specialist recruitment businesses, enabling them to be market leaders within their respective sectors.

With a strong entrepreneurial culture and financial backing, by joining nGAGE we benefit from the security, shared services and comprehensive support you expect from a major recruiter, combined with the autonomy and agility of a specialist consultancy.

Listed Jobs

Company Name

GCS

Job Title

PKI Cryptography Engineer

Job Description

Job Title: PKI Cryptography Engineer Role Summary: Manage, monitor, and support cryptographic assets across the organization, including PKI and digital certificate services, to protect data confidentiality, integrity, and authenticity. Perform security assessments, implement controls, provide training, and lead incident/problem management in a 24/7 environment. Expactations: Deliver high‑quality work within agreed timelines, maintain deep technical expertise in cryptography, guide or collaborate with cross‑functional teams, proactively improve security controls, communicate complex concepts to technical and non‑technical stakeholders, and uphold compliance with regulatory and internal standards. Key Responsibilities: - Operate and maintain the PKI infrastructure, including certificate lifecycle (issuance, renewal, revocation) and key management. - Conduct vulnerability assessments and penetration tests focused on cryptographic implementations; recommend and oversee remediation. - Develop and deliver training materials and documentation on cryptographic best practices, standards, and regulatory requirements. - Manage incident, problem, change, and vulnerability processes for cryptographic services. - Monitor performance and compliance of cryptographic solutions in banking applications. - Advise stakeholders on cryptographic needs, solutions, and risk mitigation. - Translate complex technical information for executive and non‑technical audiences. - Participate in 24/7 global on‑call rotation. Required Skills: - Strong knowledge of symmetric/asymmetric algorithms, key exchange, digital signatures, and encryption protocols. - Experience with PKI platforms (e.g., Microsoft CA, OpenSSL, EJBCA, DigiCert, Venafi). - Proficiency in scripting/automation (Python, PowerShell, Bash) and infrastructure as code tools. - Familiarity with security frameworks (ISO 27001, NIST, PCI‑DSS, FFIEC). - Ability to perform security assessments, penetration testing, and risk analysis. - Excellent verbal and written communication, presenting to both technical and executive audiences. - Team leadership or individual contributor capability, with a focus on continuous improvement. Required Education & Certifications: - Bachelor’s degree in Computer Science, Information Security, or related field. - Certifications such as CISSP, CISM, or CCSP preferred; PKI or cryptography‑specific credentials (e.g., PEM, CEH) are a plus.

Knutsford, United kingdom

Hybrid

09-03-2026

Company Name

GCS

Job Title

Senior Big Data Developer

Job Description

Job Title: Senior Big Data Java Developer Role Summary: Lead the design, development, and maintenance of high‑performance, cloud‑native data applications using Java and Spring Boot. Architect API services, integrate front‑end components, and ensure scalability, availability, and performance across AWS, Azure, or GCP environments. Expectations: 8+ years of professional experience; senior‑leadership responsibilities; contract work inside IR35. Must be self‑motivated, thrive in fast‑paced, rapidly evolving settings, and demonstrate strong communication skills. Key Responsibilities - Design, code, and maintain Java/Spring Boot microservices and API architectures. - Implement front‑end integration with modern UI frameworks. - Build CI/CD pipelines (Jenkins, GitLab CI, Argo, etc.) for automated testing, deployment, and monitoring. - Deploy and manage containerized workloads on Kubernetes or OpenShift; orchestrate scaling and high‑availability. - Utilize cloud services: AWS S3, Lambda, DynamoDB; Azure Blob, Azure SQL; GCP Cloud Storage, BigQuery, Cloud Functions. - Develop data pipelines, integration and transformation workflows; work with Snowflake, PostgreSQL, and other data platforms. - Optimize application performance and implement monitoring/alerting (Prometheus, Grafana, ELK). - Apply software testing principles across unit, integration, and end‑to‑end tests. - Mentor teammates, share knowledge, and support continuous improvement initiatives. Required Skills - Proficient Java < 17> and Spring Boot (including Spring Data, Spring Cloud). - Experience building RESTful APIs and gRPC services. - Familiarity with at least one modern UI technology (React, Angular, Vue). - Hands‑on CI/CD, version control (Git), branch‑policy management. - Containerization (Docker) and orchestration (Kubernetes/K8s, OpenShift). - Cloud platform expertise: AWS (S3, Lambda, DynamoDB, Snowflake), Azure, or GCP. - Data platform integration: Snowflake, PostgreSQL, S3; ETL/ELT workflow design. - Strong SQL, relational database knowledge; exposure to NoSQL, Spark, Kafka optional. - Understanding of high‑availability, scalability, monitoring, and performance tuning. - Solid grasp of software testing methodologies and DevOps practices. Required Education & Certifications - Bachelor’s degree or equivalent in Computer Science, Engineering, or related field. - Relevant certifications (e.g., AWS Certified Solutions Architect, Azure Data Engineer Associate, Google Cloud Professional Data Engineer) preferred but not mandatory.

Farnborough, United kingdom

Hybrid

Senior

26-03-2026