Location: London (Hybrid)Sector: Financial Services Engagement Type: Contract (Inside IR35)Role OverviewOne of our clients is seeking experienced Senior Data Engineers to support the design, build, and operation of production-grade data pipelines in a complex, large-scale regulated environment.This role involves close collaboration with internal engineering teams to improve data reliability, pipeline performance, and long-term system sustainability. You will be embedded within the client organisation, contributing directly to critical systems used in daily operations.Key ResponsibilitiesBuild and operate batch and streaming pipelines with software engineering practicesUnderstand and remediate data quality issues.Stabilise unreliable systems and resolve data quality issuesImprove system performance and reduce operational overheadCollaborate with platform, infrastructure, security, and application teamsQualifications & ExperienceStrong production experience in Data Engineering environmentsSolid computer science fundamentals and data modelling skillsProficiency in Python for data engineering (e.g. PySpark, Pandas)Advanced SQL (and SparkSQL) with a strong focus on data quality and lineageExperience with Spark, Athena, Glue, Redshift or similar technologiesCloud experience in AWSEngagement DetailsLong-term (1yr) engagement with potential for extension into 2027Hybrid working model: 3 days per week in Central London.Very competitive daily rate Start date: within 1 month, subject to background checks and onboarding.Applicants must be legally authorised to work in the United Kingdom. This position does not provide Visa SponsorshipInfraTier UK and its clients are equal opportunity employers. All qualified applicants will be considered without regard to legally protected characteristics. Reasonable accommodations are available upon request.