Principal Database Engineer – SQL Server & AI Data Infrastructure
WEX Inc.
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Benefits offered by this job
Job summary
WEX Inc. is seeking a Principal Database Engineer to modernize and scale our data platforms, leveraging deep SQL Server and T‑SQL expertise and applying AI-enabled approaches to data infrastructure.
You will own complex database initiatives across OLTP/OLAP, build migration automation, and collaborate with SRE, operations, architecture, and AI/ML teams to deliver reliable, enterprise-grade solutions. This role is hands-on and highly technical.
Qualifications
- 15+ years of experience in database engineering or related technical discipline.
- Deep hands-on experience with Microsoft SQL Server and T‑SQL, including complex stored procedures, query optimization, execution‑plan analysis, indexing, and performance tuning.
- Experience modernizing or refactoring legacy database systems in large-scale environments.
- Experience with data pipelines, ETL/ELT, data integration, batch processing, and/or event-driven architectures.
- Strong programming skills in Python or C# for automation and tooling.
Responsibilities
- Design, develop, optimize, and modernize large-scale SQL Server databases and data platforms.
- Analyze and refactor complex T‑SQL, stored procedures, functions, and database logic.
- Identify and resolve database performance bottlenecks through execution‑plan analysis, indexing, query optimization, and database tuning.
- Drive schema improvements and database modernization initiatives that improve scalability, maintainability, and reliability.
- Develop migration strategies and automation that maintain data integrity and minimize disruption to business‑critical systems.
- Implement and improve data replication and synchronization patterns across transactional and analytical environments.
- Apply event‑driven database patterns such as Change Data Capture (CDC), outbox patterns, and event publishing.
- Engineer solutions for large, high‑volume databases supporting critical business applications and partners.
- Work with databases containing terabytes of data and complex data relationships.
- Develop data pipelines and integration patterns across SQL Server, PostgreSQL, Snowflake, and cloud data services.
- Support both OLTP and OLAP environments and optimize data movement between systems.
- Apply strong understanding of database internals, including indexing, locking, transactions, isolation levels, concurrency, and query optimization.
Skills
Tools
Job description
WEX is looking for a highly experienced Database Engineer to help modernize and scale critical data platforms while supporting the next generation of AI-enabled applications. This is a hands‑on engineering role for someone who brings deep expertise in SQL Server and T‑SQL, combined with the ability to solve complex database performance, scalability, and modernization challenges at enterprise scale. You will work across large, business‑critical data environments, partnering closely with application engineering, SRE, operations, and architecture teams. The role is highly technical and execution‑oriented—you will be expected to independently identify problems, drive solutions, and take ownership from design through implementation and production. The team is also applying modern AI capabilities to database engineering, including AI‑assisted development, automation, semantic search, embeddings, and vector‑based data infrastructure.
Database Engineering & Modernization
Design, develop, optimize, and modernize large‑scale SQL Server databases and data platforms.
Analyze and refactor complex T‑SQL, stored procedures, functions, and database logic.
Identify and resolve database performance bottlenecks through execution‑plan analysis, indexing, query optimization, and database tuning.
Drive schema improvements and database modernization initiatives that improve scalability, maintainability, and reliability.
Develop migration strategies and automation that maintain data integrity and minimize disruption to business‑critical systems.
Implement and improve data replication and synchronization patterns across transactional and analytical environments.
Apply event‑driven database patterns such as Change Data Capture (CDC), outbox patterns, and event publishing.
Enterprise‑Scale Data Platforms
Engineer solutions for large, high‑volume databases supporting critical business applications and partners.
Work with databases containing terabytes of data and complex data relationships.
Develop data pipelines and integration patterns across SQL Server, PostgreSQL, Snowflake, and cloud data services.
Support both OLTP and OLAP environments and optimize data movement between systems.
Apply strong understanding of database internals, including indexing, locking, transactions, isolation levels, concurrency, and query optimization.
Use modern AI coding assistants such as GitHub Copilot, Cursor, Claude Code, or similar tools to accelerate development, analysis, debugging, and modernization.
Explore and implement AI‑powered approaches for analyzing stored procedures, documenting schemas, and automating database engineering workflows.
Contribute to AI‑native data infrastructure, including embedding pipelines, vector databases, semantic search, and retrieval systems.
Develop data and retrieval capabilities that support AI applications and agentic workflows.
Evaluate emerging AI tools and determine where they can improve engineering productivity and data platform capabilities.
Independently lead complex database engineering initiatives from problem definition through production implementation.
Serve as a technical resource for complex database and performance challenges.
Partner effectively with application engineering, SRE, operations, architecture, and AI/ML teams.
Provide technical guidance through code reviews, design discussions, and engineering standards.
Mentor other engineers and contribute to the development of database engineering practices.
Take ownership of outcomes rather than simply completing assigned tasks.
Participate in resolving high‑impact production issues involving critical database systems.
Diagnose complex problems using logs, database metrics, CPU/memory utilization, execution plans, and other observability data.
Quickly determine root cause, coordinate with the appropriate technical teams, and drive issues through resolution.
Balance immediate incident resolution with longer‑term improvements that prevent recurrence.
Required Experience 15+ years of experience in database engineering, data platform engineering, software engineering, or a related technical discipline. Deep hands‑on experience with Microsoft SQL Server and T‑SQL, including complex stored procedures, query optimization, execution‑plan analysis, indexing, and performance tuning. Demonstrated experience modernizing or refactoring legacy database systems, not simply maintaining existing environments. Experience working with large‑scale, business‑critical databases and high‑volume data environments. Strong programming skills in Python, C#, or a similar language for automation, tooling, and data processing. Experience with data pipelines, ETL/ELT, data integration, batch processing, and/or event‑driven architectures. Strong understanding of database internals, transaction management, concurrency, locking, and performance optimization. Experience working across engineering teams and independently driving complex technical initiatives.
AI & Modern Data Technologies
Experience using AI coding assistants such as Cursor, GitHub Copilot, Claude Code, Augment, or similar tools. Familiarity with embeddings, vector databases, semantic search, or RAG concepts. Experience with or willingness to build AI‑enabled data tooling and automation. Exposure to technologies such as PostgreSQL, Snowflake, Azure SQL, Cosmos DB, AWS data services, or similar platforms.
Cloud & Engineering Practices
Experience with infrastructure‑as‑code such as Terraform, ARM/Bicep, or similar technologies. Experience with CI/CD, source control, database migrations, schema versioning, and deployment automation. Experience with event streaming technologies such as Kafka is a plus. Familiarity with NoSQL and document databases is a plus.
Experience in payments, financial services, healthcare, benefits, or other highly regulated environments. Experience supporting highly available, customer‑facing or business‑critical systems. Experience with Oracle PL/SQL in addition to SQL Server. Hands‑on experience with RAG, semantic search, vector databases, or AI‑agent data infrastructure. Experience building internal engineering tools or automation using AI.
WEX operates at a significant enterprise scale, and our database platforms are foundational to critical customer and business experiences. This role sits at the intersection of deep database engineering, large‑scale modernization, cloud data platforms, and emerging AI technologies. You will have the opportunity to apply proven database engineering expertise to some of the industry's most challenging data problems while helping shape how AI can transform the way modern engineering teams build, operate, and evolve data platforms. This is an opportunity for an engineer who wants to remain deeply technical while operating with the ownership and influence expected at the Senior Staff level.
The base pay range represents the anticipated low and high end of the pay range for this position. Actual pay rates will vary and will be based on various factors, such as your qualifications, skills, competencies, and proficiency for the role. Base pay is one component of WEX's total compensation package. Most sales positions are eligible for commission under the terms of an applicable plan. Non‑sales roles are typically eligible for a quarterly or annual bonus based on their role and applicable plan.
- health, dental and vision insurances
- retirement savings plan
- paid time off
- health savings account
- flexible spending accounts
- life insurance
- disability insurance
- tuition reimbursement
- and more
Pay Range: $165,800.00 - $204,400.00
WEX is a global commerce platform that helps businesses solve for operational complexities like employee benefits, managing and mobilizing fleets, and streamlining payments. With over 6,500 employees, we work with large and small companies in more than 200 countries and territories, and can tailor our services to meet the unique needs of their businesses. We hire people who share our passion for continuous innovation and client service that is unparalleled in the industry. Offering comprehensive and market competitive benefits, our offerings are designed to support your personal and professional well‑being.
WEX is an equal opportunity employer committed to diversity and inclusion in the workplace. All qualified applicants will receive consideration for employment without regard to sex, race, color, age, national origin, religion, sexual orientation, gender identity, protected veteran status, disability or other protected status. WEX promotes a drug‑free workplace. Qualified individuals with a disability have the right to request a reasonable accommodation. If you require a reasonable
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