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  •  ...grade Java applications, design patterns, and performance optimization. # Microservices and REST API Proficiency: Skilled in developing web services, particularly microservices architectures, and REST APIs. This indicates a strong understanding of how to build,... 
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    Full time

    Veracity

    O Fallon, MO
    3 days ago
  • $115k - $184k

     ...Integrations Design and implement integrations with third-party SaaS platforms to enhance functionality and streamline processes. Develop and maintain APIs for SaaS integrations, ensuring they are secure, reliable, and scalable. Troubleshoot and resolve integration... 
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    Part time
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    MasterCard

    O Fallon, MO
    3 days ago
  • $138k - $221k

     ...a strong sense of ownership and innovative spirit? The Cloud Data Platforms team is an excellent opportunity for you to design and develop the next wave of data innovation at MasterCard. Our program is leading the efforts to bring our data and analytics expertise into the... 
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    Full time
    Part time
    Worldwide
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    Missouri Staffing

    O Fallon, MO
    1 day ago
  • Lead Full Stack Engineer Job Location: O'Fallon, MO (Hybrid onsite 3 days/week) Job Travel Location(s): Must be able to travel to office as needed Positions: 1 Employment Type: C2H Duration: Long Term Key Technology: Java, Full Stack, SQL Job Responsibilities: Lead...
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    3 days per week

    Veracity

    O Fallon, MO
    1 day ago
  • Senior Azure Platform Engineer Mastercard is a global technology company in the payments industry. Our mission is to connect and power an inclusive, digital economy that benefits everyone, everywhere by making transactions safe, simple, smart, and accessible. Using ...
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    MasterCard

    O Fallon, MO
    10 hours ago
  •  ...owners Understands operational and engineering experience, actively works to improve experience and metrics in ownership area Develop complete understanding of end-to-end technical architecture and dependency systems Drive adoption of technology standards and... 
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    Contract work
    Local area

    ShiftCode Analytics

    O Fallon, MO
    4 days ago
  • $112k - $187k

     ...we are responsible for ensuring that our platform is stable and healthy. We break down barriers to run our products by fostering developer run ownership and empowering developers to build resilient products. We support our developers during the application build phase... 
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    MasterCard

    O Fallon, MO
    2 days ago
  •  ...passion for solving complex technical challenges? Do you love learning new technologies and apply it to your team? Have you developed software before - preferably in Java or C/C++? Have you spent time in Linux environments? Have you created scripts to... 
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    H1b
    Local area
    Worldwide

    ShiftCode Analytics

    O Fallon, MO
    4 days ago
  •  ...development with deep experience in Java, microservices, and cloud-native technologies. This is a highly technical role ideal for senior developers or leads passionate about solving complex problems in a fast-paced environment. Key Responsibilities: Design, develop, and... 
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    Full time
    Local area

    Veracity

    O Fallon, MO
    4 days ago
  • $100k - $105k

     ...microservices while providing technical leadership to both onshore and offshore teams. Req. #873804476 Responsibilities Design and develop Java-based microservices architecture Ensure implementation quality, including maintainability, security, and performance best... 
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    Temporary work
    Flexible hours

    EPAM Systems Inc

    O Fallon, MO
    3 days ago
  • $200k - $320k

     ...undifferentiated heavy lifting. These may be built by A&T team members, curated from best practices in other Mastercard teams, or co-developed by A&T and engineers from the Guild. The Role: As an A&T Sr Principal Software Engineer you will participate in numerous... 
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    MasterCard

    O Fallon, MO
    2 days ago
  •  ...-1 ( Need only local candidates ) Visa : USC, GC, GC EAD, H4, L2 Description: We are looking for more junior java developers that have experience with testing that are looking to get into testing. Biggest thing will be confidence with reading code and... 
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    Local area

    ShiftCode Analytics

    O Fallon, MO
    4 days ago
  • $72k - $115k

     ...security, reliability, and performance to deliver solutions that delight our customers. We are looking for talented software engineers to develop advanced technologies and applications that are revolutionizing payments. Are you passionate about software engineering? Do... 
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    Part time
    Worldwide
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    MasterCard

    O Fallon, MO
    2 days ago
  • Software Engineer I Location: O'Fallon, MO (Local is Preference) Linux operating and scripting Python with API automation- scripting automation for day to day task Cryptography- how the cert works, and managing it Python or Java- understanding how they run ...
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    Local area

    RIT Solutions

    O Fallon, MO
    2 days ago
  •  ...: DOE U.S. Citizens and those authorized to work in the U.S. are encouraged to apply. We are unable to sponsor the currently Job Description Java, Spring, and Spring Boot Required. Everything is developed in that Rest API knowledge is a plus Very Mu...... 
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    Staffing the Universe

    O Fallon, MO
    4 days ago
  • $115k - $184k

     ...you're passionate about building great software and ready to grow your career, we'd love to hear from you. Role Hands-on developer who writes high quality, secure code that is modular, functional and testable. Create or introduce, test, and deploy new technology... 
    Full time
    Part time
    Worldwide
    Flexible hours

    Missouri Staffing

    O Fallon, MO
    3 days ago
  • Senior Software Dev Engineers O'Fallon MO (remote FOR NOW but will need to eventually be onsite) We can consider fully remote for a very strong candidate Looking for 2 Senior Software Dev Engineers This is part of
    Remote work

    Samprasoft

    O Fallon, MO
    3 days ago
  •  ...Senior Software Engineer (iOS Developer) Location: St Louis, Missouri Duration: 12 months Glider: Software Engineer ADVANCED What are your top 3 required technical skills? Advanced level knowledge of native iOS development (Swift/Objective-C/Swift UI)... 

    RIT Solutions

    O Fallon, MO
    1 day ago
  • About Us: At *** (*** | Connected World, Connected Experiences), we live the philosophy of connected world and connected experiences. We thrive on change that is powered by the intelligent symphony of technology and humans designing meaningful and sustainable experiences...

    Yantran LLC

    O Fallon, MO
    4 days ago
  • Software Engineer II Location: O'Fallon, Missouri (Main Campus) --- Local Candidates Only!! Duration: End of 2025 Glider: Software Engineer II - (Apache Spark, Airflow, Databricks, AWS, CICD and Coding(Java/Python/Scala); What are your top 3 required technical skills...
    Local area

    RIT Solutions

    O Fallon, MO
    2 days ago
  •  ...reliability, performance, and are driven to deliver solutions that delight our customers. We are looking for talented software engineers to develop advanced technologies and applications that are revolutionizing payments. Software engineers at Mastercard build the systems that... 
    Work experience placement
    Internship

    MasterCard

    O Fallon, MO
    5 days ago
  • $138k - $221k

     ...lifecycle, including secure model training, validation, and deployment. Support security engineers in the evaluation of AI systems being developed and implemented. Compliance and Standards: Keep track of emerging industry standards, regulations, and best practices for AI... 
    Full time
    Part time
    Flexible hours

    MasterCard

    O Fallon, MO
    5 days ago
  • Job Title: Junior Email Marketing Developer Please read the information in this job post thoroughly to understand exactly what is expected of potential candidates. Location: On-Site (O’Fallon, MO) Position Type: Full-time Exempt Summary: Milestone Marketing... 
    Full time
    Apprenticeship
    Work at office
    Local area
    Flexible hours

    Automotive Product Consultants, LLC

    O Fallon, MO
    13 hours ago
  • Job Title: Senior Email Marketing Developer The following information provides an overview of the skills, qualities, and qualifications needed for this role. Reporting to: Marketing Operations Specialist Location: On-Site (O’Fallon, MO) Position Type: Full-time... 
    Full time
    Apprenticeship
    Work at office
    Local area
    Flexible hours

    Automotive Product Consultants, LLC

    O Fallon, MO
    23 hours ago
  • Job Title Need strong Testng, Selenium, Java Coding experience Must have: Bachelors or Masters in CS or related degrees. Minimum of 6+ years with Master or 8+ years with Bachelors of hand on experience in software development in test automation, concurrent coding skills...

    Staffing the Universe

    O Fallon, MO
    1 day ago
  •  ...solutions. Define requirements for new applications and customization adhering to MasterCard standards, processes and best practices. Develop, customize, and test applications to integrate to MasterCard's specifications. Provide leadership, mentoring, and technical... 
    Work experience placement

    MasterCard

    O Fallon, MO
    4 days ago
  •  ...relates to building, supporting and implementing full stack Java solutions within the rest of the application environment. Will also develop Angular on the front end. Any ERP experience is nice to have as well. The existing team is strong in their working knowledge but... 
    Full time
    Local area
    Remote work
    Relocation

    Timeless Technology Solutions

    Dardenne Prairie, MO
    10 hours ago
  • $115k - $184k

     ...play a critical role in: Collaborate with stakeholders to understand business process and identify automation opportunities. Design, develop, and implement RPA solutions using Automation Anywhere 360. Partnering with Scrum Master and Product Owners to lead day to day... 
    Full time
    Part time
    Worldwide
    Flexible hours

    MasterCard

    O Fallon, MO
    1 day ago
  • $138k - $221k

     ...services in the delivery of internal or market-facing Products, Platforms, or Product bundles Work with business/product owners to develop and deliver on new services to introduce new products and bundles Ensure objectives and development plans are established at the... 
    Full time
    Part time
    Worldwide
    Flexible hours

    MasterCard

    O Fallon, MO
    1 day ago
  • $92k - $147k

     ...that help people, businesses and governments realize their greatest potential. Title and Summary Software Engineer II - iOS Developer Software Engineer II: Who is Mastercard? Mastercard is a global technology company in the payments industry. Our mission is... 
    Full time
    Part time
    Worldwide
    Flexible hours

    MasterCard

    O Fallon, MO
    3 days ago