Senior .NET / SSIS Developer

Job#: 3028523

Job Description:
Role Overview

This team owns the maintenance, modernization, and enhancement of approximately 60 mission-critical batch jobs, roughly half of which are built using .NET and SSIS. These jobs support core business operations and require a high level of stability, reliability, and performance.

We are seeking a hands-on Senior .NET / SSIS Developer in the Austin, TX area to help drive this effort. The role focuses on supporting existing batch workflows, enhancing and modernizing legacy implementations, and ensuring reliable execution of scheduled processes. This is a senior-level individual contributor role with immediate delivery expectations.

Key Responsibilities

• Maintain, enhance, and modernize mission-critical batch jobs, including .NET and SSIS-based workflows
• Develop and support SSIS packages used for batch processing and data movement
• Support and enhance SQL Server-based batch jobs and scheduled processes
• Analyze, refactor, and optimize legacy batch jobs for performance, reliability, and maintainability
• Write and tune complex SQL queries and stored procedures
• Perform SQL Server performance tuning and optimization
• Monitor, support, and troubleshoot production batch execution
• Perform root cause analysis for batch failures, data issues, and processing errors
• Ensure reliable execution of scheduled and automated jobs
• Produce clear documentation for batch logic, SSIS packages, and data flows
• Collaborate with QA, production support, and full-time engineering teams

Required Skills & Experience

• 5+ years of professional software development experience
• Strong, hands-on experience with SSIS package development, support, and enhancement
• Strong SQL Server expertise, including:
  • Complex queries
  • Stored procedures
  • SQL performance tuning
• Proven experience building and supporting SQL-based batch processing systems
• Solid working experience with .NET / C#, particularly in backend or batch-driven applications
• Experience supporting scheduled batch jobs in production environments
• Strong troubleshooting and debugging skills, especially for batch failures and data issues
• Ability to work independently on mission-critical systems with minimal oversight

Preferred (Nice to Have)

• Experience with batch job schedulers such as:
  • SQL Server Agent
  • Control-M
  • AutoSys
• Experience working with legacy batch processing systems
• Familiarity with Git and CI/CD pipelines
• Experience in financial services or other regulated environments

EEO Employer

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at or .

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click for more details.

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Apex team member can provide.