Jobs in O'Fallon, Missouri, United States

Commercial Data Integration Platform (CDIP) at Mastercard builds scalable pipelines using Databricks to ingest Recorded Future data and merge it with Mastercard datasets, uncovering actionable insights for commercial products. The Lead Developer mentors a mixed team of internal engineers and contractors, driving deployment, operational excellence, and continuous enhancement of the platform.

Mastercard's Business Operations (Biz Ops) team seeks a Business Operations Engineer to serve as the production readiness steward for Mastercard products, including Mastercard Send. Day-to-day work includes monitoring platform stability, supporting software run principles (change implementation, operational design, automation), performing triage and blameless post-mortems, and aligning product and customer priorities with operational needs.

The Senior AI Engineer is responsible for designing, developing, deploying, monitoring, and continuously improving AI-enabled solutions that transform how Technology Regulatory Execution (TREx) delivers regulatory, customer, compliance, and risk management activities. This role combines strong software engineering, machine learning, generative AI, and automation capabilities to build scalable solutions that improve operational efficiency, enhance stakeholder experiences, and support regulatory e

Mastercard seeks a Senior Software Engineer in O'Fallon, Missouri to design and deliver secure, scalable software solutions that power global digital payments. The role involves leading development activities, mentoring team members, and managing the full systems development life cycle while collaborating with distributed teams.

New Horizons Youth Baseball League (NHYBL) partners with the City of O'Fallon to provide safe, fair, and enjoyable baseball and softball experiences for youth ages 7U–14U. The Umpire officiates games, leads pre‑game plate meetings, conducts field inspections, and ensures game flow while promoting safety and sportsmanship.

Mastercard's Enterprise Data Quality team is seeking a Senior Data Engineer to build and scale the company's next-generation Data Quality platform. Day-to-day work involves designing and developing high-performance data pipelines, data quality frameworks, and cloud-native data solutions using Spark, Scala/Python/Java, Databricks, and AWS, while partnering with Data Strategists, Data Stewards, Product Owners, Architects, and Engineering teams.

In Corporate Solutions, we empower our customer’s businesses to succeed through innovative, trusted payment solutions that deliver a seamless digital-first experience around the world. We are disrupting the industry by developing world-class travel and B2B solutions for our corporate clients around the globe.

Assistant Manager at Popeyes in O'Fallon, Missouri leads daily restaurant operations, coaching crew, and ensuring top-tier guest experiences. The role supports the General Manager, manages labor and food costs, and maintains quality and safety standards.

Athletico seeks a Physical Therapy Aide in O'Fallon, MO to support the clinical team by maintaining treatment areas and equipment while providing excellent customer service. The role involves cleaning sterilizing supplies, engaging patients, and ensuring facility organization.

The Catholic High School Coach is responsible for leading, developing, and mentoring student-athletes while supporting the school’s Catholic mission and values. The coach will foster an environment that promotes faith, character, teamwork, discipline, sportsmanship, academic responsibility, and athletic excellence.

Transaction Stream team at Mastercard builds applications and services that power critical capabilities across the real-time payment network. The Senior Software Engineer designs, develops, tests, and maintains scalable test frameworks, automation solutions, and validation tools while collaborating with engineers and product partners.

Database Engineering team at Mastercard builds secure, scalable enterprise database platforms. The Lead PostgreSQL Engineer drives design, automation, and operational excellence of PostgreSQL services, partners with software engineers, architects, and SREs to deliver resilient cloud‑native databases.

Kia Veterans Technician Apprenticeship Program (VTAP) at Napleton's Mid Rivers Kia trains military veterans to become certified service technicians. Technicians diagnose, maintain, and repair Kia vehicles—including engine, transmission, HVAC, and electrical systems—while completing repair orders and warranty requests.

Mastercard Networks Exchange (NEX) provides a single payment connection supporting both Mastercard and non-Mastercard branded financial transactions. It is a central point of connectivity that enables transaction originators and receivers — issuers, acquirers, merchants, and processors — to reach the networks of their choice, reducing the time, expense, and complexity of maintaining multiple direct connections.

Mastercard Technologies – the engineering organization building scalable payment solutions. The Senior Software Development Engineer designs and develops highly scalable distributed systems, leads architecture decisions, mentors junior engineers, and ensures production reliability.

Catering Lead At Panera, our people come first. If you're looking for a place where you can grow, feel supported, be yourself, enjoy great perks, and have a little fun along the way—you're in the right spot.

Summary: Keeps buildings clean and orderly. Performs heavy cleaning duties, including cleaning floors, shampooing rugs, washing walls and glass, and removing rubbish.

Park Place Senior Living at Winghaven, a Sonida Senior Living community in O'Fallon, MO, provides independent, assisted, and memory care to residents. As a Dishwasher, you will clean and sanitize tableware and cookware, organize dish and storage areas, maintain kitchen and service area cleanliness, assist the cook on the serving line during meals, and interact courteously with residents, families, staff, and visitors.

The Technical Program Manager (TPM), Program Governance drives execution excellence across B&MI’s technology portfolio by establishing governance frameworks, delivering portfolio insights, and enabling data-driven decision making. This role partners with engineering, product, operations, and business leaders to ensure strategic initiatives are aligned, risks and dependencies are managed, and delivery outcomes are transparent and predictable.

SUMMARY An Optometric Technician is a valuable asset to an optometrist as they assist in providing a world class Total Patient Experience. This team member is able to handle a wide range of duties while using optical equipment to perform the initial testing needed to prepare a patient for an exam with an Optometrist.