Jobs in O Fallon, MO
80 open roles — posted here, and found on employers' own careers sites.
11 new this week, 0 the week before, counting only boards we were already tracking.
Lead Software Integration Engineer (Release Management) – Workday & HR Platforms
Mastercard
O Fallon, MO
Listed on Mastercard’s careers site · Apply there ↗
Senior Database Platform Engineer (Oracle)
Mastercard
O Fallon, MO
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VP, GBSC Value Creation and Delivery
Mastercard
O Fallon, MO
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Vice President, Technology Risk Managment
Mastercard
O Fallon, MO
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Software Engineer II
Mastercard
12 locations
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Program Manager, Learning & Development
Mastercard
O Fallon, MO
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Lead Data Engineer
Mastercard
2 locations
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Data Engineer II
Mastercard
2 locations
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Senior Software Engineer - Java
Mastercard
O Fallon, MO
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Vice President Platform Engineering
Mastercard
O Fallon, MO
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Manager, Site Reliability Engineering
Mastercard
O Fallon, MO
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Manager, Finance Business Partner
Mastercard
2 locations
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Lead Platform Architect
Mastercard
O Fallon, MO
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Senior AI Engineer, Big Data & AI Solutions
Mastercard
O Fallon, MO
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Lead Software Engineer(Recorded Future)
Mastercard
Full-time · O Fallon, MO · $140,000 – $231,000
Mastercard is looking for an experienced developer to lead a team building and maintaining their Commercial Data Integration Platform, which uses Databricks to process data from Recorded Future and Mastercard sources. This role suits someone with a track record of technical leadership who can mentor engineers, ensure engineering excellence, and collaborate across organizational boundaries.
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Site Reliability Engineer II
Mastercard
O Fallon, MO
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Lead Software Engineer
Mastercard
10 locations
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Senior Site Reliability Engineer
Mastercard
O Fallon, MO
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Manager, Software Engineering
Mastercard
4 locations
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Director, Finance Business Partner - Technology Infrastructure
Mastercard
Full-time · O Fallon, MO · $142,000 – $234,000
This Director-level role partners with technology leadership to manage financial planning, performance reporting, and strategic investments for Mastercard's global payments infrastructure. It suits experienced finance business partners comfortable advising senior technologists and managing complex budgets across distributed teams.
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Principal Software Engineer
Mastercard
Full-time · 5 locations · $170,000 – $281,000
This Principal Software Engineer role leads the architectural vision for Mastercard's SME partnerships platform, designing cloud-native systems that handle global transaction volumes at scale. The position suits experienced backend engineers with deep financial services expertise who want to mentor teams and shape platform strategy across a worldwide organization.
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Manager, AI Engineering (Tester )
Mastercard
Full-time · O Fallon, MO · $140,000 – $231,000
This is a management role overseeing AI quality and testing for Mastercard's generative AI and LLM systems, suited to engineers with deep expertise in production AI evaluation frameworks and the ability to lead testing strategy across complex AI workstreams.
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Senior AI Engineer
Mastercard
Full-time · O Fallon, MO · $115,000 – $184,000
This role leads the design and deployment of large language model systems, agents, and retrieval-augmented generation pipelines at enterprise scale. It suits experienced ML engineers who have built production generative AI applications and want to architect next-generation AI systems within a global fintech organization.
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Senior Technical Program Manager
Mastercard
3 locations
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Manager, Payroll
Mastercard
Full-time · O Fallon, MO · $112,000 – $179,000
A payroll leadership role managing the integration of acquired or divested companies into Mastercard's systems, ensuring compliance and operational continuity across multiple countries. This suits experienced payroll professionals with M&A project management background who can coordinate across technical teams and regional operations.
Listed on Mastercard’s careers site · Apply there ↗