Application Developer II

POSITION SUMMARY McCarthy is seeking a full-time Application Developer, who as part of the Engineering and Intelligence team, will play a crucial role in building business applications and user experiences on the Palantir Foundry platform, supporting existing systems, and driving innovation through modern Dev Sec Ops  practices.

The primary focus for this role is development on the Foundry platform: creating AI-enabled solutions that deliver intuitive user experiences, streamline operational workflows, support informed decision-making, and provide reusable application components that help McCarthy teams act on trusted data. The developer will work closely with product owners, data engineers, Foundry Ontology specialists, technology architects, and business stakeholders to translate user requirements into secure, maintainable, production-ready solutions.

RESPONSIBILITIES Solution Design and Development Design and develop application solutions on Palantir Foundry, with primary responsibility for the application and user experience layers built on top of the Ontology.

Build custom applications using OSDK, Type Script, and React, integrating Ontology objects, relationships, Actions, and Functions to support structured data and unstructured content.

Leverage Foundry capabilities, including Workshop, Functions, and AIP, to streamline operational workflows, enable AI-powered experiences, and support informed decision-making. Integrate applications with enterprise systems through REST APIs and supported event-driven patterns.

Translate business requirements into secure, scalable, and maintainable application designs, applying established development patterns, creating reusable components, and incorporating usability, accessibility, and user feedback.

Partner with data engineers and data architects to actively shape and develop a robust Ontology, ensuring its objects, relationships, properties, and Actions support application requirements and operational workflows.

Quality Assurance and Delivery Develop and maintain automated tests, participate in code reviews, and validate application functionality, integrations, and AI-enabled features against defined acceptance criteria.

Develop, test, and deploy solutions using strong CI/CD practices and Foundry’s branching, version control, and deployment capabilities to enable reliable releases.

Apply Agile practices to plan and manage assigned work, communicate progress and dependencies, and deliver user stories iteratively.

Application Support and Continuous Improvement Monitor, troubleshoot, and optimize deployed Foundry applications, addressing defects, integration failures, and performance, usability, and reliability issues in collaboration with relevant teams.

Implement and validate application fixes and enhancements using established testing, code review, and deployment practices.

Identify opportunities to automate workflows, improve application performance, and enhance end-user experience.

Stay current with Foundry capabilities and relevant development technologies, applying new knowledge to improve solution quality and delivery.

Security and Governance Develop applications that respect Foundry’s access controls, including roles, markings, and granular data permissions, and follow established security and governance standards.

Apply secure coding practices to OSDK applications and integrations, including appropriate authentication, credential management, and handling of sensitive data.

Test application behavior across user roles and permission levels, and collaborate with security and platform teams to address identified issues.

Collaboration and Knowledge Sharing Build strong partnerships with internal Digital Enterprise teams, business stakeholders, and…