Full-time Jobs in O'Fallon, Missouri, United States

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.

The Patient Service Specialist supports outpatient physical therapy centers by ensuring exceptional patient experiences from the front desk. This role manages daily operations including greeting patients, scheduling appointments, and handling insurance verifications and co-pays.

Schreiter Ready Mix hires an experienced Class A CDL driver for its end dump truck fleet, delivering aggregates to ready‑mix concrete plants in the St. Charles area. The driver performs pre‑trip and post‑trip inspections, ensures safety compliance, and collaborates with mechanics for maintenance.

Schreiter Concrete Co's Ready Mix team delivers high‑quality concrete across the St. Charles region. Drivers operate concrete mixer trucks, ensure timely deliveries, and maintain safety and vehicle standards.

Are you ready to make a difference in your community? Join the City of O'Fallon as a Full-Time Police Officer Recruit.

The Transformation Team leads strategic change initiatives to reimagine how Mastercard works and scales, simplifies, and accelerates business outcomes. The team partners across leadership, product, technology, and operations to design and implement new organizational models, embed AI across key workflows, drive enterprise-wide transformation programs, improve operating effectiveness, and ensure successful adoption of change.

We are seeking an experienced User Experience Design Subject Matter Expert to help shape and scale the user experience for our enterprise Product Onboarding Strategy, ensuring onboarding journeys are intuitive, consistent, and customer-centered across our product portfolio. Role Details As the User Experience Design SME, you will lead the experience design strategy for Product Onboarding, helping define how customers and internal users interact with onboarding capabilities across platforms such

The Manufacturing Operations Manager is responsible for leading all aspects of manufacturing and production operations to achieve safety, quality, delivery, cost, and customer objectives. This role provides leadership across Production, Manufacturing Engineering, Planning, Facilities, and other assigned operations functions while ensuring the organization has the people, processes, equipment, and capacity required to support current programs and future growth.

Archdiocese of St. Louis Catholic Education and Formation seeks a Substitute Teacher to uphold its mission of providing faith‑based education. The role involves following lesson plans, creating a safe, respectful classroom rooted in Catholic values, supervising students across activities, and communicating daily summaries to the regular teacher.

The Mastercard Treasury Services Program owns the settlement platform for all Mastercard’s transactions. The primary purpose of this role will be to lead a team of software engineers to deliver the next generation of this settlement platform.

FOCUS Childcare Attendant at the Archdiocese of St. Louis provides a safe, welcoming environment for children while parents attend Bible studies and parish activities. The role supervises children, leads age‑appropriate activities such as crafts and games, and maintains clean, organized childcare spaces.

The Sales Associate at United Pacific works at an assigned store location and assists in the operation of the facility in a safe, customer-focused, and profitable manner. You will perform various duties including, but not limited to: Daily cash handling, lighting/fixtures cleaning & maintenance, and ensuring the security of all inventory and currency to avoid theft and inventory shrinkage.

ACE Cash Express Retail Team provides financial services and products to local customers. Sales Associates engage customers, recommend appropriate ACE services, handle cash and transactions, and ensure compliance with regulations.

The Clinical Associate in Physical Therapy within the Program in Physical Therapy at Washington University in St. Louis provides comprehensive, one-on-one assessments and individualized therapy plans for patients, primarily treating outpatient pelvic health conditions. Day-to-day duties include evaluating patients, developing tailored treatment plans, completing medical documentation, collaborating with billing and referring providers, and potentially teaching within the Doctor of Physical Thera

The Senior Accountant will be a key contributor within Mastercard's global controllership organization, supporting treasury accounting, foreign exchange accounting, and related financial reporting activities. This position will partner closely with Treasury, Corporate Accounting, Technical Accounting, Financial Planning & Analysis, Financial Systems, and regional finance teams to help ensure accurate and timely accounting for cash, investments, foreign currency exposures, and treasury-related tr

At Mastercard Commercial Solutions, we empower businesses to succeed through innovative, trusted payment solutions that deliver seamless, digital-first experiences around the world. We are building a global business-to-business (B2B) technology platform that helps businesses of all sizes streamline how they manage payments when buying or selling products and services.

Lead Site Reliability Engineer at Mastercard. Lead Biz Ops SRE ensuring platform stability, scalability, and performance for Java, Spring, Python, Go services.

P&C Engineering team at Mastercard builds enterprise applications that enhance employee experiences worldwide. As Lead Software Integration Engineer, you will architect and deliver Workday Extend solutions, design reusable frameworks, and drive AI‑powered automation across the platform while leading Agile delivery teams.

Senior Software Engineers at Mastercard design and code artificial intelligence, cloud, and machine learning platforms that provide mission-critical insights to many of the world’s leading organizations and governments. As a Senior Software Engineer, you will deliver these products and solutions with speed and agility as part of a small team.

Property Catastrophe Claims Team at Chubb handles personal and commercial property claims, especially natural disaster and catastrophic events. The Senior Property Claims Specialist assesses damage, investigates claims, manages reserves, and ensures accurate, timely resolutions while using digital tools and virtual inspections.