Why Castelion, Why Now

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability.

This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.

Contracts Manager

The Contracts Manager will be a key member of Castelion's Government Programs organization and will be responsible for contract administration and execution across a portfolio of U.S. Government contracts and agreements.

This individual will work directly with program managers, business development, finance, legal, engineering, and government contracting counterparts to ensure Castelion understands and meets its contractual obligations while enabling programs to execute quickly and effectively.

The ideal candidate has strong working knowledge of U.S. Government contracting, can independently interpret contractual requirements, and is comfortable taking ownership of complex contract actions from proposal through negotiation, award, performance, modification, and closeout. This role requires someone who can balance sound contracting judgment and compliance with Castelion's bias toward speed, simplicity, and execution.

Responsibilities

Own contract administration across multiple U.S. Government programs from award through contract completion and closeout
Serve as a primary contractual interface with Government Contracting Officers, Contract Specialists, DCMA personnel, and other acquisition stakeholders
Partner closely with program managers to understand contractual requirements, milestones, deliverables, funding, and performance obligations and ensure successful execution
Review and negotiate U.S. Government contracts, Other Transaction Agreements (OTAs), modifications, task orders, delivery orders, and related agreements
Review Requests for Proposal (RFPs), Requests for Information (RFIs), solicitations, and draft contractual documents to identify requirements, risks, and business implications
Coordinate proposal preparation and submission across program management, engineering, finance, legal, supply chain, and business development
Develop and maintain proposal compliance matrices, contractual assumptions, exceptions, representations and certifications, and other business volumes
Review and interpret contract terms, FAR and DFARS clauses, statements of work, CDRLs, data rights requirements, invoicing requirements, and other contractual obligations
Lead the preparation and negotiation of contract modifications, requests for equitable adjustment, funding actions, schedule changes, and other contract actions
Track contract funding, ceilings, CLINs, period of performance, deliverables, options, and other key contractual milestones
Coordinate with finance and program teams to ensure accurate and timely invoicing, payment, and funding management
Establish and maintain complete, accurate, and audit-ready contract files and correspondence
Support contract compliance activities, Government reviews, audits, and interactions with DCMA, DCAA, and other Government organizations as applicable
Support negotiation and administration of non-disclosure agreements, teaming agreements, subcontracts, and supplier agreements when required
Partner with legal counsel on complex regulatory, intellectual property, data rights, export control, disputes, and other legal matters
Develop scalable contracting processes, templates, tools, and playbooks that enable Castelion to manage an expanding portfolio of Government programs without unnecessary bureaucracy
Identify contractual risks early, develop practical mitigation strategies, and drive issues to resolution rather than simply identifying them
Establish and maintain strong, trusted relationships with Government customers and contracting counterparts