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Senior SQL Developer Contract - Initial 12 Months Dublin, Hybrid Rate: €500-€750 per day (DOE) Role Description We are seeking a Lead / Senior SQL Database Engineer to guide our core data infrastructure through a massive, multi-terabyte data transformation. You will serve as the technical authority on SQL Server performance, working directly alongside our development team to identify severe database bottlenecks, maintain transactional integrity, and re-architect legacy data pipelines. This role balances hands-on firefighting in a high-volume environment with forward-looking strategy ensuring rapid, secure data movement while preparing our ecosystem for next-generation data platforms. Key Responsibilities High-Volume Data Migration & Transformation: Design and execute strategies to move multi-terabyte datasets rapidly across disparate systems while maintaining strict financial-grade data integrity, archiving, and restore operations. Performance Tuning & Optimization: Deep-dive into complex query plans, index strategies, and execution bottlenecks. Write and optimize advanced T-SQL constructs (CTEs, Windowing functions, temp tables). Cross-Platform ETL Engineering: Build, maintain, and troubleshoot enterprise SSIS packages and ETL workflows pulling data from heterogeneous sources, including Oracle and legacy SQL Server instances. Developer Engagement & Coaching: Collaborate directly with application developers to analyze poor-performing queries, review schema designs, and establish data access best practices. Infrastructure & Hardware Guidance: Evaluate database hardware needs, procurement, and infrastructure configurations (SQL Server 2016+) to scale throughput for heavy enterprise workloads. Required Skills & Qualifications Deep SQL Server Expertise: 8+ years of experience with SQL Server (2016 or newer), including expert-level T-SQL, query execution plan analysis, and database internal architecture. Terabyte-Scale Experience: Proven track record managing, migrating, and optimizing multi-terabyte relational databases under strict uptime and security requirements. Advanced T-SQL Development: Exceptional mastery of complex CTEs, Windowing functions, dynamic SQL, partitioning, and automated maintenance scripts. ETL & Heterogeneous Integration: Hands-on proficiency with SSIS and moving data efficiently between non-SQL engines (e.g., Oracle) and SQL Server. Data Lifecycle Management: Experience implementing large-scale backup/restore, cold/hot data archiving strategies, and high-availability setups. Preferred Experience Background in US Financial Services, Fintech, or highly regulated data environments (compliance, audit trails, data encryption). Semantic layer exposure (SSAS, data modeling concepts) or familiarity with modern cloud data warehouse transitions. Exposure to full-stack engineering concepts to better collaborate with application dev teams. Berkley Business & Technology is a specialist consultancy, recruiting professionals for organizations throughout Ireland, UK & Europe; for more information go to www.berkley-group.com. If you would like to discuss this vacancy further or to discuss your career options in confidence, please send your profile to brendanoconnell@berkley-group.com
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The employers posting the most developer roles are Link Group (369 jobs), Upvanta (257), jobgether (226), and OfferZen (212). If you're applying to any of these, research their hiring patterns. They move fast and post often, which means they're either scaling hard or replacing people who didn't fit.
In your interview, expect this: 'Walk me through the last time you had to debug something that took you more than an hour. What was it, what did you try first, and what would you do differently?' Hiring managers ask this to see if you think systematically or just try random fixes. Have a real example ready with specifics.