Are you looking for an opportunity to truly make a difference? Do you want to join a collaborative, mission-driven team that protects the planet, strengthens communities, and supports businesses when they need it most? Are you seeking a place where your work contributes directly to an organization known for excellence in environmental services, crisis management, and emergency response? If your answer is “yes,” then you belong at Ambipar.
We are seeking a Director of Proposals with extensive experience successfully leading proposal operations and managing a diverse proposal team, all while maintaining a notable record of submitting winning proposals. The Director of Proposals will be responsible for the leadership, management, and ongoing development of the Witt O’Brien’s Proposal Team, comprised of talented proposal specialists, proposal coordinators, and graphic designers geographically dispersed across the country. You will be expected to direct the full lifecycle of the proposal preparation process for local, state, and federal government opportunities. This position will coordinate the efforts of and work collaboratively with capture managers, practice leaders, and technical SMEs to plan, develop, and deliver compliant, complete, and compelling proposals. The Proposal Team supports capture coaching, letter proposals, and solicitation responses through orals interviews and best and final offers (BAFO).
This position requires the ability to comfortably work with senior management, subject matter experts, technical staff and external partners while simultaneously leading, managing, and mentoring staff assigned to the Proposal Team. It also demands the ability to engage at an executive level in the business development process by providing value added insight on win strategies and differentiators based on continuous assessment of proposal success and client feedback. The use of a CRM to manage and report on proposal support is an essential component of the role.
The ideal candidate is a thought-leader, able to see the big picture without overlooking the details, fosters a positive and responsive team environment, and can quickly adjust to dynamic proposal development schedules and requirements, while managing corporate processes, systems/tools, and activities related to proposal execution and knowledge management.
Requires the flexibility and willingness to adapt work schedule, if necessary, to support Sector’s time-sensitive or pressing needs (i.e., when the company is facing an impending bid/proposal deadline directly related to a strategic client or Sector target).
This position description incorporates the core responsibilities of the job. It recognizes that other related duties not specifically mentioned might also be performed, and that not all responsibilities may be carried out depending on operational needs.
The hiring department will conduct interviews of qualified individuals prior to requesting a criminal background check, and no job application submitted prior to such interview shall inquire into an applicant's criminal history. If this position is subject to a background check for any convictions related to its responsibilities and requirements, employment will be contingent upon successful completion of a background investigation including criminal history. Criminal history will not automatically disqualify a candidate.
Equal Opportunity Employer/Veteran/Disabled
With you when it counts.

Ambipar USA is a specialized partner for high-hazard, high-consequence operations, combining industrial services, emergency response, and environmental solutions into one integrated platform. Ambipar operates a network of service locations and response bases, positioned to support industrial facilities, transportation corridors, ports, terminals, and energy infrastructure with 24/7 coverage. Our teams are built around HAZMAT and complex incident management, with recognized expertise in chemical, petrochemical, and multi-commodity risk. From tank cleaning, integrity work, and plant maintenance to spill response, remediation, and waste management, we support the lifecycle of industrial assets with safe, compliant, and cost-effective execution.
Ambipar is a leading commercial hazmat response organization, with experience managing large-scale chemical releases, oil spills, fires, and multi-agency emergencies across all modes of transportation. Our teams specialize in containment, product transfer, neutralization, and decontamination, using advanced equipment and engineered systems to stabilize incidents and protect people, assets, and the environment. This capability is backed by 24/7 command center, technical support, and a broad response network.
Beyond immediate response, Ambipar delivers environmental solutions that cover remediation, hazardous waste packaging, transport and disposal, plus long-term recovery programs. We align practices with stringent regulatory requirements, helping clients reduce environmental liabilities while maintaining business continuity and protecting reputation. Our portfolio also includes industrial cleaning, confined space work, decommissioning, and specialized projects in complex, high-risk environments. For clients seeking a single partner to manage hazardous materials, complex operations, and environmental risk, Ambipar provides an integrated, incident-tested solution from preparedness through response and recovery.