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Senior Data Engineer

Dublin, Ireland | Hybrid | 12-month Contract

About the Company

Our client is a large, global technology-driven organisation operating in a highly regulated, data-rich industry, delivering services at scale to millions of customers worldwide.

About the Role

As a Senior Data Engineer, you will develop and maintain data pipelines that extract, transform, and load (ETL) data from a wide variety of sources into centralised data platforms such as a data warehouse or data lake. You will ensure the smooth, reliable flow of data from source to destination systems while upholding rigorous data quality and integrity standards, working within a highly regulated environment.

Primary ResponsibilitiesData integration: integrate data from multiple sources and systems, including databases, APIs, log files, streaming platforms, and external data providers. Handle ingestion, transformation, and consolidation to create a unified, reliable data foundation for analysis and reporting.Data transformation and processing: develop transformation routines to clean, normalise, and aggregate data. Handle complex data structures and missing or inconsistent data, preparing data for analysis, reporting, and machine learning use cases.Contribute to common frameworks and best practices in code development, deployment, and automation/orchestration of data pipelines.Implement data governance and data de-identification frameworks in line with company and regulatory standards.Partner with data analytics and product leaders to design best practices and standards for developing and productionising analytic pipelines.Partner with infrastructure leaders on architecture approaches to advance the data and analytics platform, including exploring new cloud-based tools and techniques (Azure, Snowflake, and others).Monitoring and support: monitor data pipelines and systems to detect and resolve issues promptly. Develop monitoring tools, alerts, and automated error handling to ensure data integrity and system reliability.Required QualificationsExtensive experience designing data solutions, with a solid understanding of architectural patterns, system design principles, data modelling, and large-scale solution development.Extensive hands-on experience developing data processing jobs (PySpark/SQL) demonstrating strong software engineering principles.Proven experience with Azure Databricks and Snowflake.Experience orchestrating data pipelines using tools such as Azure Data Factory, Airflow, or similar.Proven experience working with Spark.Advanced SQL skills and deep experience with relational databases (e.g., SQL Server), including optimisation, stored procedures, and performance tuning for high-volume applications.Experience with DevOps tooling, Git workflows, and building CI/CD pipelines.Experience applying data governance controls, data masking, and data de-identification rules within a highly regulated environment.Excellent communication and interpersonal skills, with the ability to convey technical concepts to both technical and non-technical stakeholders.Preferred QualificationsExperience analysing and improving workflows: evaluating process maps and flowcharts, identifying inefficiencies, and recommending enhancements to procedures, technology, and tools.Familiarity with languages such as Java or Scala.A motivated self-starter who manages their own tasks and takes ownership.Experience working in agile/scrum teams.Strong Python skills for data manipulation, cleaning, transformation, and analysis of structured data.Familiarity with production-quality ML/AI model development and deployment.Data architecture experience.

GCS is acting as an Employment Business in relation to this vacancy.

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Service Operations Engineer (2nd Line Support)

One of our clients is looking for an experienced 2nd Line Service Operations Engineer to join their growing team. In this role, you will provide 2nd line technical support, resolve complex incidents, maintain IT infrastructure, manage system patching, and ensure services are delivered in line with agreed SLAs. You will also work closely with 1st and 3rd Line Support teams, customers, and third-party vendors to deliver high-quality technical support.

📍 Location: Stoke-on-Trent
💼 Job Type: Permanent
🔒 Security Clearance: Candidates must be eligible to obtain UK Security Clearance (SC).

Essential Skills:

Strong experience in 2nd Line IT SupportExperience working within an MSP environmentWindows Server & Microsoft 365Active Directory / Microsoft Entra IDPatch ManagementNetworking (TCP/IP, DNS, DHCP, VPN)VMware and/or Hyper-VAzure and/or AWSPowerShell (desirable)ITIL and ITSM tools (ServiceNow or Jira)

Interested? Apply now with your latest CV.

GCS is acting as an Employment Agency in relation to this vacancy.

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BI Analyst (SC Cleared)

Ready to turn data into decisions? We're looking for a BI Analyst who can transform complex datasets into clear, actionable insights that drive performance across the organisation.

What You'll Do

Analyse Data across sales, marketing, finance, and operations to spot trends and opportunities.

Build Dashboards in Power BI that bring KPIs and performance metrics to life.

Gather Requirements and translate business needs into smart, scalable BI solutions.

Ensure Data Quality through strong governance and validation.

Deliver Insights via ad‑hoc analysis and deep‑dive investigations.

Collaborate with BI developers, data engineers, and business teams to deliver value.

What You'll Bring

5+ years' experience in BI or data analysis.

Strong analytical skills and confidence working with large data-sets.

Power BI expertise (or similar BI tools).

Solid SQL and data manipulation capability.

Excellent communication and stakeholder management skills.

Ability to turn business questions into technical solutions.

Relevant certifications are a bonus.

Why This Role?

You'll work on meaningful data projects that directly influence business decisions. If you're curious, analytical, and passionate about BI, this role gives you the platform to make a real impact.

GCS is acting as an Employment Business in relation to this vacancy.

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Software Tester (SC Cleared)

Drive quality. Accelerate delivery. Own automation. We're looking for a Software Tester who can build robust automated test solutions that boost efficiency, reduce manual effort, and ensure high‑quality software releases.

What You'll Do

Build Automation Strategy - Identify what to automate, prioritise test cases, and shape a scalable automation approach.

Develop Test Frameworks - Create and maintain automation frameworks using Selenium, Appium, TestNG, JUnit, or similar tools.

Write & Execute Scripts - Build reliable, maintainable automated tests across platforms, devices, and environments.

Integrate with CI/CD - Embed automated tests into pipelines using Jenkins, GitLab CI, Azure DevOps, etc.

Manage Test Data - Create and maintain test data sets and environments for automation.

Analyse & Report Results - Run automated suites, diagnose failures, and log defects clearly in JIRA.

Collaborate in Agile - Work closely with developers, product teams, and manual testers; contribute to sprint ceremonies.

Share Knowledge - Train team members and maintain documentation for frameworks, scripts, and processes.

What You'll Bring

Experience as an Automated Tester or Test Automation Engineer.

Strong skills in Selenium WebDriver, Appium, TestNG, JUnit, or similar tools.

Solid programming ability in Java, Python, C#, or JavaScript.

Experience with Git, Azure DevOps, or other version control systems.

Hands‑on CI/CD pipeline experience.

Excellent problem‑solving and attention to detail.

Strong communication and teamwork skills.

Agile experience (Scrum/Kanban).

Test automation certifications (ISTQB etc.) are a plus.

Why This Role?

You'll be at the heart of improving software quality and delivery speed. If you're passionate about automation, efficiency, and building reliable test solutions, this role gives you the platform to make a real impact.

GCS is acting as an Employment Business in relation to this vacancy.

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Role: Zero Trust Network Access Architect

Duration: 6-month rolling Contract

Rate: Up to 700 Inside ir35

Location: London - 2 days a week on site.

We're supporting a major cyber transformation programme and are seeking an experienced Zero Trust Network Access Architect to define and deliver a Zero Trust strategy across a global organisation.

Must have experience leading large-scale enterprise programmes end-to-end.

Key responsibilities:

Define the Zero Trust strategy, roadmap and target architecture.Lead delivery of a global Zero Trust blueprint across organisationDrive adoption across Identity, Endpoint, Network and Cloud security workstreams.Work closely with Entra ID, Conditional Access, PIM, Intune, Defender and Zscaler teams.

To find out more, please apply now or send your CV to [email protected]

GCS is acting as an Employment Business in relation to this vacancy.

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QA Automation Engineer / QA AnalystPosition Overview

We are seeking an experienced QA Automation Engineer / QA Analyst to join a fast-paced Agile development team supporting enterprise software applications. This role is responsible for ensuring the quality and reliability of software through test planning, automation, API validation, and end-to-end testing. The ideal candidate will have strong experience with Python scripting, Java-based applications, automated testing frameworks, and API testing while collaborating closely with developers, business analysts, and product owners throughout the software development lifecycle.

ResponsibilitiesDevelop, maintain, and execute comprehensive test plans, test cases, and automated test scripts for enterprise applications.Perform functional, regression, integration, system, and end-to-end testing to ensure software quality and reliability.Design and execute business use cases that accurately reflect real-world customer scenarios.Develop Python scripts to support testing of Java-based middleware and backend services.Perform API testing using REST, JSON, and Swagger to validate application functionality and data integrity.Track and report quality assurance metrics, including defect trends, test execution results, and overall test status.Log, document, and assist in troubleshooting software defects through resolution.Analyze software quality data and recommend process improvements to enhance testing efficiency and product quality.Participate in release planning, sprint activities, and risk assessments to identify potential delivery issues and mitigation strategies.Collaborate with developers, business analysts, product owners, and cross-functional teams throughout the Agile software development lifecycle.Support CI/CD testing activities using Jenkins and assist with automated build validation.Utilize Splunk and other diagnostic tools to analyze application logs and investigate production or test failures.Maintain test documentation, test evidence, and quality standards throughout the project lifecycle.Participate in quality reviews and audits to ensure compliance with organizational testing standards and best practices.Mentor team members on QA processes and contribute to continuous improvement initiatives.Required QualificationsBachelor's degree in Computer Science, Information Systems, or a related technical discipline (or equivalent professional experience).5-8 years of overall Quality Assurance experience.Minimum of 3 years of hands-on Python scripting experience.Strong experience with automated testing frameworks such as Selenium or Cypress.Experience testing Java-based applications or middleware.Experience performing API testing using REST, JSON, Swagger, or similar tools.Experience using Jenkins for CI/CD testing activities.Experience using Splunk or similar log analysis tools.Experience with test management tools such as TestRail.Experience working in Windows environments within Agile/Scrum teams.Knowledge of scripting languages such as JavaScript, Python, C#, VBScript, or JScript.Strong analytical, troubleshooting, and problem-solving skills.Excellent verbal and written communication skills.Ability to manage multiple priorities in a fast-paced Agile environment.Preferred QualificationsExperience supporting enterprise-scale applications.Experience with test automation framework development and maintenance.Exposure to media, telecommunications, or customer-facing digital platforms.Experience with performance or reliability testing.Familiarity with modern DevOps and CI/CD practices.

GCS is acting as an Employment Business in relation to this vacancy.

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* Establish milestones and monitor adherence to plans and schedules, identify delivery risks, and obtain/drive mitigation strategies and solutions
* Test cases, Use cases, Python scripting for JAVA middleware development, REST, Json, Jenkins, Splunk, Swagger
* Define and execute relevant business scenarios to satisfy real-world business needs.
* Define and tracks quality assurance metrics such as defects, defect counts, test results and test status.
* Collect and analyzes data for software process evaluation and improvements, and integrates them into business processes to address the needs of the business.
* Responsible for developing and executing formal test plans to ensure the delivery of quality software applications. Involved in test planning, writing test cases/scripts, test case automation and test execution.
* Document all problems and assists in their resolution.
* Deliver quality process training to technical staff and acts as an internal quality consultant to advise or influence business or technical partners.
* Perform quality audits across the various IT functions to ensure quality standards, procedures and methodologies are being followed.


Skills
* Bachelor's Degree in Computer Science, Information Systems, or similar. Or equivalent work experience.
* 5-8 years of overall QA testing experience
* Minimum of 3+ years of hand-coded Python scripting experience.
* MUST have automated testing experience
* QA testing JAVA is required
* 3+ years of Windows software QA and testing experience in an agile environment using the scrum framework
* Experience with test case management tools (TestRail)
* Experience with scripting languages (Javascript, Jscript, VBScript, C#, Python, etc.)
* Experience with API testing
* Familiarity with media planning and buying workflows and/or software systems
* Ability to function well within their team, working with POs, BAs, developers, and other team members.
* Strong organization skills and the ability to work on multiple concurrent projects, with a high standard of quality
* Excellent analytical and troubleshooting abilities
* Strong oral and written communication skills
* The ability to quickly shift priorities and adapt to change

GCS is acting as an Employment Business in relation to this vacancy.

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GCS is acting as an Employment Business in relation to this vacancy.

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GCS is acting as an Employment Business in relation to this vacancy.

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GCS is acting as an Employment Business in relation to this vacancy.

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