Application Developer II

McCarthy Holdings, Inc.; Phoenix, Dallas (AZ, TX); On-site; USD 90,000 - 120,000; Full time

Job summary

McCarthy Holdings, Inc. is seeking an Application Developer II to join the Enterprise Solutions and Analytics team in shaping our integration portfolio and AI-driven solutions.

You will design, build, and secure applications and integrations across McCarthy’s technology stack, championing modern DevSecOps practices and a strong emphasis on reusable components. The role emphasizes collaboration with IT and business stakeholders, agile execution, and continuous improvement through learning and

Qualifications

• 3+ years in iPaaS platforms (Boomi, Mulesoft, SnapLogic) with Boomi preferred.

Responsibilities

• Design and develop integration solutions using standard patterns, REST APIs, message queues, and event-based processing.
• Build custom AI applications on Palantir and integrate them with McCarthy’s ecosystem.
• Promote modular design and reusable components for long-term scalability.
• Support procurement by evaluating technical capabilities and providing insights.
• Provide timely technical support to application teams to minimize end-user disruption.
• Follow security practices: input validation, least privilege, encryption, and threat modeling.
• Assist in project execution with agile planning and task management.
• Pursue continuous learning and leverage vendor events for skill growth.
• Collaborate with internal IT and business analysts to translate requirements into effective solutions.

Skills

API-driven integration

SQL

JSON/XML

Palantir AI platform

Modern stack development

DevSecOps

CI/CD

Agile/Scrum

Continuous learning

Communication skills

Team player

Cloud platforms (AWS/Azure)

SFTP/PGP security

Office 365

Checkmarx/OWASP

GitHub/Snyk/Terraform

Terrasan

Education

Bachelor’s degree in a relevant field

Tools

Boomi

Mulesoft

SnapLogic

Checkmarx

OWASP

GitHub

Snyk

Terraform

Terrasan

SFTP

PGP

AWS

Azure

Office 365

Job description

POSITION SUMMARY

McCarthy is seeking a full-time Application Developer II located in St. Lous, MO who as part of the Enterprise Solutions and Analytics team, will play a crucial role in building our application and integration portfolio, supporting our existing systems and driving innovation following modern DevSecOps practices.

RESPONSIBILITIES

Solution Design and Development

• Design and develop integration solutions by applying best practices and standard patterns in data model design, data transfer and event-based processing. Leverage integration capabilities such as Rest APIs, message queues and remote process execution in developing solutions. Implement solutions that process both structured and unstructured data (images, videos, model files etc.).
• Design and develop custom applications on AI platform Palantir, integrating them into McCarthy’s ecosystem of applications.
• Develop solutions for maximum reusability, using components available in enterprise applications and platforms. Promote modular approach in solution design and development. Maintain a robust integration application and integration environment to promote long-term flexibility and growth.
• Support the procurement of new applications and platforms by evaluating technical capabilities and providing insight.

Support and Administration

• Provide technical support and guidance for efficient and effective resolution of issues. Respond to queries from application teams in a timely manner to reduce disruption to end users.

Security

• Ensure integration and application solutions follow McCarthy’s security practices and guidelines.
• Enforce input validation and output encoding, avoid hardcoded secrets and credentials, apply least privilege logic in API and service interactions, use strong modern cryptography, sanitize logs, and perform threat modeling early and regularly.
• Adhere to and promote a shift-left security mindset for pipeline, secrets management and supply chain functions.

Project Execution, Task Management

• Follow best practices and support organizational effort in managing projects and tasks effectively. Demonstrate an agile mindset in planning and execution of tasks.

Continuous Learning and Improvement

• Constantly seek to improve current solutions. Identify opportunities to improve performance, automate workflows and improve end-user experience.
• Keep up with the latest on tools and platforms by attending vendor events and leveraging learning opportunities.

Internal Relationship Management

• Develop strong partnerships with internal IT staff to ensure solutions address McCarthy’s needs effectively and requests are addressed in a timely and effective manner. Work closely with business system analysts and product owners in understanding requirements and building solutions that implement user stories effectively.

QUALIFICATIONS

• Minimum 3 years of experience with an enterprise iPaas (integration platform as a service) such as Boomi, Mulesoft or Snaplogic. Boomi experience would be preferable.
• Strong knowledge of database capabilities and API-driven integration frameworks. Strong knowledge of SQL. Solid understanding of data formats including JSON and XML.
• Experience developing solutions on an AI platform such as Palantir is a plus.
• 3 – 5 years of application development experience on a modern stack (e.g., .NET 6+/C#, Node.js/TypeScript, Python, Ruby — Ruby on Rails/Sinatra/ActiveRecord) building RESTful services, event-driven components, and CI/CD-backed deployments; familiarity with containers and cloud services is a plus.
• Working knowledge of DevSecOps practices and tools (DAST/SAST/SCA/secrets scanning) and severity-based remediation workflows in CI/CD. Examples of tools include Checkmarx, OWASP, GitHub, Snyk, Terrasan and Terraform
• Practical experience with secure file transfer (SFTP), key management, and PGP encryption in automated pipelines.
• Knowledge of cloud platforms such as AWS, Azure and Microsoft Office 365.
• Experience working on projects using an Agile approach and the Scrum framework.
• Constant learner with a passion for continuous growth and improvement.
• Strong interpersonal and communication skills. Strong team player with a collaborative mindset.

McCarthy is proud to be an equal opportunity employer, including disability and protected veteran status.