Senior SQL Developer - Client site Addison Texas

NTT DATA strives to hire exceptional, innovative and passionate individuals who want to grow with us. If you want to be part of an inclusive, adaptable, and forward-thinking organization, apply now.

We are currently seeking a Senior SQL Developer - Client site Addison Texas to join our team in Addison, Texas (US).

We are seeking a highly experienced 8+ years in SQL Server/T-SQL Developer with deep expertise in query optimization, performance tuning, and refactoring complex database code, along with a strong understanding of how APIs interact with SQL Server stored procedures and databases. The ideal candidate will work closely with application, API, and DBA teams to ensure that database logic is efficient, scalable, and correctly consumed by upstream services.

This role plays a key part in improving performance, reliability, and maintainability across database‑driven applications.

• SQL Server Development & Optimization
• Analyze, optimize, and tune complex T‑SQL queries for performance and scalability
• Refactor and rewrite legacy stored procedures, views, functions, and triggers to improve execution efficiency and maintainability
• Optimize database access patterns used by API‑driven applications
• Design and optimize indexing strategies (clustered, non‑clustered, filtered as appropriate)
• Performance Tuning & API Interaction
• Identify performance bottlenecks caused by API call patterns, excessive round‑trips, or inefficient parameter usage
• Tune stored procedures consumed by RESTful or service‑based APIs
• Code Quality & Standards
• Enforce T‑SQL best practices and performance‑focused coding standards
• Collaboration & Communication
• Collaborate with API and application developers
• Provide guidance on best practices for calling stored procedures from APIs
• Clearly communicate database performance findings and recommendations to both technical and non‑technical stakeholders

• 5+ years expertise in Microsoft SQL Server (2016–2022)
• 5+ years proficiency in T‑SQL
• 3+ years experience in query optimization and performance tuning
• 3+ years hands‑on experience rewriting complex stored procedures, views, functions, and triggers
• 3+ years solid understanding of API‑to‑database interaction patterns (e.g., REST APIs calling stored procedures)
• Strong knowledge of execution plans, indexing strategies, statistics, and SQL Server optimizer behavior

• Excellent communication skills, especially when working with application and API teams
• Strong analytical and troubleshooting abilities
• Ability to work independently while collaborating across teams
• Proactive mindset toward performance and reliability improvements

NTT DATA is a $30 billion business and technology services leader, serving 75% of the Fortune Global 100. We are committed to accelerating client success and positively impacting society through responsible innovation. We are one of the world's leading AI and digital infrastructure providers, with unmatched capabilities in enterprise‑scale AI, cloud, security, connectivity, data centers and application services.

Whenever possible, we hire locally to NTT DATA offices or client sites. While many positions offer remote or hybrid work options, these arrangements are subject to change based on client requirements. If you are requested to provide payment or disclose banking information, please submit a contact us form at

NTT DATA is an equal opportunity employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or protected veteran status. For Pay Transparency information, please visit

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