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ETLData Test Engineer (24 07)
Job Location:
Job Location:
Letterkenny - Ireland
Monthly Salary:
Not provided by the employer
Monthly Salary:
Posted:
26 July 2026 (30+ days ago)
Posted:
Application Deadline:
30 November 2026
Application Deadline:
Vacancies:
1 Vacancy
Vacancies:
Job Summary
If you need support in completing the application or if you require a different format of this document please get in touch with us at with the subject line: Application Support Request.
Job Type: Permanent
Location: Letterkenny GDC Co. Donegal (Hybrid minimum 3 days onsite per week)
Do you have strong experience in ETL and data testing with the ability to validate complex data flows and integrations
Do you bring a solid QA background with experience in automation testing and defect investigation across enterprise applications
Are you an analytical problem solver who enjoys investigating data issues identifying risks early and helping teams deliver quality solutions with confidence
Make your mark at TCS as anETL/Data Test Engineer.
Join a global tech leader right here in Donegal. With over 850 employees and a state-of-the-art global delivery centre were proud to offer world-class career opportunities without having to leave the Northwest. Recognised as Workplace of the Year by the Letterkenny Chamber we foster a culture of continuous learning innovation and respect. Our people are at the heart of everything we do collaborating across teams geographies and disciplines to drive real change for clients around the world. Be part of something global grounded in Donegal.
TCS is a purpose-led transformation company built on belief. We do not just help businesses to transform through technology. We support them in making a meaningful difference to the people and communities they serve - our clients include some of the biggest brands in the UK and worldwide. For you it means more to make an impact that matters through challenging projects which demand ambitious innovation and thought leadership.
The Role
We are seeking an experienced ETL/Data Test Engineer with a strong background in data testing and quality assurance. The ideal candidate will have proven experience in ETL testing data migration testing data reconciliation testing SQL validation batch processing validation and Automation testing. This is a hands-on role for that requires a detail-oriented professional who can analyse complex data flows investigate issues perform root cause analysis and ensure the accuracy and integrity of data across multiple systems.
You will help shape the testing approach review requirements understand business contextvalidatedata and integrations and clearly communicate quality risks before release. The role suits someone proactivepracticaland confident with the ability to work across different priorities while keeping quality and delivery in focus.
The successful candidate should be comfortable working in a fast-paced Agile environment and possess excellent communication stakeholder management and analytical skills.
Key Responsibilities:
Essential skills/knowledge/experience:
Required Technical Skills
ETL & Data Testing
SQL & Database Testing
Data Analysis & Excel
Linux & Job Monitoring
Automation Knowledge (Preferred)
Desirable skills/knowledge/experience:
Rewards & Benefits
TCS is consistently voted a Top Employer in the UK and globally. Our competitive salary packages feature pension health care life assurance laptop phone access to extensive training resources and discounts within the larger Tata network.
We offer health & wellness initiatives and sports events; we are the proud sponsor of the London Marathon.
Diversity Inclusion and Wellbeing
Tata Consultancy Services UK&I is committed to meeting the accessibility needs of all individuals in accordance with the UK Equality Act 2010 and the UK Human Rights Act 1998.
We welcome and embrace diversity in race nationality ethnicity disability neurodiversity gender identity age physical ability gender reassignment sexual orientation. We are a disability inclusive employer and encourage disabled people to apply for this role.
As a Disability Confident Employer we offer an interview to applicants with disabilities or long-term conditions who meet the minimum criteria for the role. Please email us if you would like to opt in.
If you are an applicant who needs any adjustments to the application process or interview please contact us the subject line: Adjustment Request. We welcome requests prior to you completing the application and at any stage of the recruitment process.
Beware of Fraudulent offers
This is to notify you that TCS does not ask for any sort of payment or security deposit from candidates at any stage of the recruitment process. The firm never sends out job offers from free internet email services like Gmail Yahoo Mail and so on. TCS has not authorised any third-party company to collect money on their behalf. As a vigilant job seeker beware of fraudulent recruitment activity and protect your interests!
You can write to to report any fraudulent activity.
Due to the high volume of applications we will be unable to contact each applicant individually on the status of their application. If you have not received a direct response within 30 days then it should be deemed unsuccessful on this occasion.
Join us and do more of what matters. Apply online now.
Job Type: Permanent
Location: Letterkenny GDC Co. Donegal (Hybrid minimum 3 days onsite per week)
Do you have strong experience in ETL and data testing with the ability to validate complex data flows and integrations
Do you bring a solid QA background with experience in automation testing and defect investigation across enterprise applications
Are you an analytical problem solver who enjoys investigating data issues identifying risks early and helping teams deliver quality solutions with confidence
Make your mark at TCS as anETL/Data Test Engineer.
Join a global tech leader right here in Donegal. With over 850 employees and a state-of-the-art global delivery centre were proud to offer world-class career opportunities without having to leave the Northwest. Recognised as Workplace of the Year by the Letterkenny Chamber we foster a culture of continuous learning innovation and respect. Our people are at the heart of everything we do collaborating across teams geographies and disciplines to drive real change for clients around the world. Be part of something global grounded in Donegal.
TCS is a purpose-led transformation company built on belief. We do not just help businesses to transform through technology. We support them in making a meaningful difference to the people and communities they serve - our clients include some of the biggest brands in the UK and worldwide. For you it means more to make an impact that matters through challenging projects which demand ambitious innovation and thought leadership.
- Join a leading global IT services organisation.
- Be part of an exciting team where you will be challenged every day.
- Gain exposure to innovative technology.
The Role
We are seeking an experienced ETL/Data Test Engineer with a strong background in data testing and quality assurance. The ideal candidate will have proven experience in ETL testing data migration testing data reconciliation testing SQL validation batch processing validation and Automation testing. This is a hands-on role for that requires a detail-oriented professional who can analyse complex data flows investigate issues perform root cause analysis and ensure the accuracy and integrity of data across multiple systems.
You will help shape the testing approach review requirements understand business contextvalidatedata and integrations and clearly communicate quality risks before release. The role suits someone proactivepracticaland confident with the ability to work across different priorities while keeping quality and delivery in focus.
The successful candidate should be comfortable working in a fast-paced Agile environment and possess excellent communication stakeholder management and analytical skills.
Key Responsibilities:
- Own QA activities for assigned work from requirement review through to release readiness.
- Review user stories and requirements to understand business context risksdependenciesand downstream impacts.
- Design and execute clear test scenarios covering functional integration regressiondataand edge-case testing.
- Ask questionsvalidateassumptionsand raise risks early when requirements test coverageenvironmentsor timelines are unclear.
- Clearly communicate test progress defects blockers releaseconfidenceand any remaining quality risks.
- Take part in Agile ceremonies including refinement sprint planning stand-ups defecttriageand release discussions.
- Support colleagues through knowledge sharing constructivefeedbackand a strong team-first approach.
- Perform end-to-end ETL and data testing activities.
- Validate source-to-target mappings transformation rules and business requirements.
- Execute data migration data reconciliation and data validation testing.
- Verify data accuracy completeness consistency and integrity across multiple systems.
- Perform backend database testing and large-scale data analysis.
- Analyse files including CSV TXT XML and JSON for data validation purposes.
- Write and execute complex SQL queries for backend validation and reconciliation.
- Monitor and validate batch-processing activities and scheduled jobs.
- Analyse job failures and perform detailed root cause investigations.
- Review and understand Python-based scripts used in data-processing workflows.
- Work in Linux/Unix environments to analyse logs and troubleshoot issues.
- Execute automated tests using existing Java and Python-based frameworks.
Essential skills/knowledge/experience:
- 5 years of experience in software testing qualityengineeringor a similar technical QA role.
- Strong analytical and troubleshooting skills with experience in system validation defect analysis root cause identification and cross-system data reconciliation.
- Strong understanding of SDLC Agile deliveryJiraand Confluence.
- Good critical thinking skills with the ability to consider broader business impact edgecasesand production risk.
- Confident communicator who can ask clear questions challenge assumptions professionally and raise concerns early.
- Strong ownershiporganisationandprioritisationskills especially when managing multiple work items or business areas.
- Willingness to use AI-enabled tools responsibly to improve productivity analysisdocumentationor testing effectiveness.
- Hands-on experience with test automation ideally using Selenium and automation frameworks.
Required Technical Skills
ETL & Data Testing
- Strong and recent ETL/Data Testing experience.
- Proven experience in:
- ETL Testing
- Data Validation Testing
- Data Migration Testing
- Data Reconciliation Testing
- Source-to-Target Validation
- Data Quality Testing
- Data Recon Automation Testing
- Experience validating large and complex datasets.
- Strong understanding of data lifecycle data transformations and batch processing.
SQL & Database Testing
- Advanced SQL skills and data analysis capability.
- Experience writing complex queries using:
- Joins
- Aggregations
- Subqueries
- Window Functions
- Reconciliation Queries
- Experience working with SQL Server PostgreSQL MsSQL or Oracle.
- Strong database testing and backend validation experience.
Data Analysis & Excel
- Advanced Microsoft Excel skills.
- Experience using:
- Pivot Tables
- VLOOKUP/XLOOKUP
- Conditional Formatting
- Data Comparison Techniques
- Data Reconciliation Methods
- Ability to analyse large datasets and identify anomalies trends and discrepancies.
- Ability to use text/data compare tools like Beyond Compare.
Linux & Job Monitoring
- Strong Linux/Unix knowledge.
- Experience analysing logs and troubleshooting batch-processing issues.
- Experience working with Autosys or similar enterprise scheduling tools.
- Ability to investigate job failures and perform root cause analysis.
Automation Knowledge (Preferred)
- Experience executing and troubleshooting automated test suites.
- Exposure to Java Selenium TestNG Python PyTest
- Ability to understand existing automation frameworks.
- Ability to review and understand Python scripts used within testing and data-processing workflows.
Desirable skills/knowledge/experience:
- Experience in Financial Services Asset Management Banking CapitalMarketsor another data-driven enterprise environment.
- Previousexperience as a Senior QA QA Lead AutomationLeador mentor to other testers.
- Experience testing data feeds reporting processes audit trails marketdataor complex downstream data processes.
- Exposure to cloud platforms such as AWS or Azure.
- Experience with CI/CD DevOpspracticesor continuous testing approaches.
- Relevant certifications such as ISTQB Agile/Scrum AWSAzureor automation-related certifications.
Rewards & Benefits
TCS is consistently voted a Top Employer in the UK and globally. Our competitive salary packages feature pension health care life assurance laptop phone access to extensive training resources and discounts within the larger Tata network.
We offer health & wellness initiatives and sports events; we are the proud sponsor of the London Marathon.
Diversity Inclusion and Wellbeing
Tata Consultancy Services UK&I is committed to meeting the accessibility needs of all individuals in accordance with the UK Equality Act 2010 and the UK Human Rights Act 1998.
We welcome and embrace diversity in race nationality ethnicity disability neurodiversity gender identity age physical ability gender reassignment sexual orientation. We are a disability inclusive employer and encourage disabled people to apply for this role.
As a Disability Confident Employer we offer an interview to applicants with disabilities or long-term conditions who meet the minimum criteria for the role. Please email us if you would like to opt in.
If you are an applicant who needs any adjustments to the application process or interview please contact us the subject line: Adjustment Request. We welcome requests prior to you completing the application and at any stage of the recruitment process.
Beware of Fraudulent offers
This is to notify you that TCS does not ask for any sort of payment or security deposit from candidates at any stage of the recruitment process. The firm never sends out job offers from free internet email services like Gmail Yahoo Mail and so on. TCS has not authorised any third-party company to collect money on their behalf. As a vigilant job seeker beware of fraudulent recruitment activity and protect your interests!
You can write to to report any fraudulent activity.
Due to the high volume of applications we will be unable to contact each applicant individually on the status of their application. If you have not received a direct response within 30 days then it should be deemed unsuccessful on this occasion.
Join us and do more of what matters. Apply online now.
Required Experience:
IC
About Company
We strongly believe global challenges need global solutions. We are continually engaging with our employees, clients, partners, public institutions, and community organisations across the world to step up and rise to the occasion. We are #OneTCS. A part of the Tata group, India's lar ... View more
