Consequential Work. Dedicated People.

About Onebrief

Onebrief builds collaboration and AI-powered workflow software for military planning and operational coordination.

Military planning is complex by nature, requiring teams to coordinate information, people, and decisions across systems and locations. Onebrief brings planning, collaboration, simulation, and AI into one connected environment, helping teams test strategies, adapt to changing conditions, and make decisions with greater clarity when the stakes are real.

We are a distributed team of builders from military, operational, and technology backgrounds who care deeply about improving how important work gets done. Some team members work remotely, while others work directly alongside customers in operational environments around the world.

Founded in 2019, Onebrief is backed by leading investors including General Catalyst, Battery Ventures, Insight Partners, Sapphire Ventures, and Human Capital. Valued at more than $2 billion, we continue to invest in product innovation, AI capabilities, and team growth.

Required: Secret clearance

In person in Weisbaden, Germany

Why This Role Exists

As a Partner Engagement Manager at Onebrief, you're the customer's trusted technical partner. You serve as the subject-matter expert, maintaining power-user-level fluency in the platform. You stay current on product updates, translating new releases into practical impact for the specific workflows your customer relies on. You act as the primary line of communication between the customer and Onebrief — as the product evolves, you deliver ongoing, role-specific training to ensure users adopt new capabilities rather than getting stuck on outdated workflows. You bridge the technical gap between engineering and the customer, explaining product behavior in terms their staff can actually act on.

What You’ll Do

Core responsibilities:

Clearly communicate user needs to the product team. Maintain a high product proficiency, and excite the customer about each product improvement.
Understand, request, and effectively leverage Company resources to meet the goals of the Company.
Lead or support exercises.
Use your observations of our users to recommend product improvements.
Identify gaps between existing directorate workflows and effective Onebrief usage, then drive adoption through hands-on configuration, user coaching, and workflow optimization.
When responding to incidents (product is unavailable, broken, or not delighting the customer), coordinate with the customer and our product engineering team.
Align your team’s efforts to deliver the best customer experience, while coordinating with fellow Partner Engagement Managers to ensure planning and workflows remain synchronized across commands.
Enable expansion and upsell opportunities to Allies and Partners by instilling the Onebrief value proposition.

Minimum Qualifications

Proven experience in leading operational planning within a military context, preferably at multi-star headquarters.
Exposure to large staff planning, through classical training in Professional Military Education or through service experience
Familiarity and experience with major military planning exercises and the protocols for software deployment on classified networks.
Proven ability to expand business presence within a customer location with emphasis on software or technology solutions.
Experience in customer support, both face-to-face and remote, and capability to respond to incidents coordinating with customers and product engineering teams.
Strong technical skills to master our application, troubleshoot issues and liaise with customers on technical matters.
Proven ability to navigate large government organizations, solve bureaucratic challenges, and deliver successful outcomes.
You hold a current Secret clearance with eligibility for upgrade to Top Secret and have the ability to access DOD facilities and installations.

Preferred Qualifications

You’re technically adept. You don’t need to code, but you do need to be savvy. Can you become a power user of our product and talk engineering with the customer?
Customers trust you. You demonstrate strong interpersonal skills, develop rapport, align diverse perspectives, and communicate with clarity and influence.
You’re intense about our mission. It’s a core part of who you are
You’re proactive and adaptable. You see a problem and get to work. You’re comfortable working autonomously or in a cross-functional team, especially in a fast-paced or ambiguous setting
You communicate clearly, concisely, and candidly. Our Company relies on you to assess the situation within your account and effectively communicate your assessment and recommendations to inform strategic decisions.

Indicators of Success

This role will evolve as priorities change, but the outcomes below reflect what success typically looks like in the first six months.

A successful Partner Engagement Manager will:

Opinion and expertise are valued by the customer and company alike (rapport/trust)
Learns quick, identifies opportunities and drives progress within the account (Forward-leaning/ bias for action)
Open-minded and able to pivot when priorities shift (Adaptability/ Humility)

Notice to Third Party Recruitment Agencies
Please note that Onebrief does not accept unsolicited resumes from recruiters or employment agencies. In the absence of an executed Recruitment Services Agreement, there will be no obligation to any referral compensation or recruiter fee. In the event a recruiter or agency submits a resume or candidate without an agreement Onebrief explicitly reserves the right to pursue and hire those candidate(s) without any financial obligation to the recruiter or agency. Any unsolicited resumes, including those submitted to hiring managers, shall be deemed the property of Onebrief.

About the company

Onebrief provides a cloud-based planning tool tailored for defense organizations. It converts complex operational plans into reusable, real-time cards that organize information into a collaborative, update-friendly workspace. The product helps commanders, staff officers, NCOs, and defense partners react quickly to changes, speeding up decision cycles and reducing time spent on preparing slides and planning documents. Unlike traditional planning tools, Onebrief emphasizes a card-based, real-time, multi-user workflow designed for fast, synchronized planning across teams. The company operates on a software-as-a-service model with subscription revenue and is backed by Y Combinator, which signals support from a well-known startup ecosystem. Onebrief’s goal is to streamline military planning processes, improve collaboration, and deliver faster, more coordinated decisions for defense missions.

Company Size

201-500

Company Stage

Series D

Total Funding

$363.4M

Headquarters

Honolulu, Hawaii

Founded

2019

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Simplify's Take

What believers are saying

Battery and Sapphire led Onebrief's $200 million Series D in January 2026.
Grant Demaree said the round funds AI Assist, Battle Road, and wartime resiliency.
Fast Company named Onebrief one of its Most Innovative Companies for 2026.

What critics are saying

Army and Air Force procurement cycles stall revenue for quarters during reauthorization.
Battle Road integration distracts engineering while Cory Ondrejka rebuilds AI and simulation.
If classified-network accreditations slip, Onebrief becomes unusable for its highest-value customers.

What makes Onebrief unique

Onebrief unifies planning, wargaming, and simulation after the 2026 Battle Road Digital acquisition.
Secret, IL5, IL6, and Top Secret authorizations let commands use one workflow across networks.
Second Front and DAF CLOUDworks give Onebrief deployment speed inside classified government environments.

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Benefits

Remote Work Options

Growth & Insights and Company News

6 month growth

1 year growth

2 year growth

SalesTech Star

Aug 21st, 2026

Knox Systems appoints former Palantir and Onebrief executive Melissa Glauber Vice President of Marketing and Communications.

Knox Systems appoints former Palantir and Onebrief executive Melissa Glauber Vice President of Marketing and Communications. Industry veteran to lead go-to-market strategy and brand development as Knox Systems scales its work bringing American innovation to the U.S. government. Knox Systems (Knox), the largest federal AI-managed cloud provider, announced that Melissa Glauber has joined the company as Vice President of Marketing and Communications. In this role, Glauber will lead Knox's growth strategy and brand development, working closely with the company's leadership team to strengthen its position in the security and compliance ecosystem. Glauber joins Knox with more than a decade of go-to-market experience delivering complex software products to commercial enterprises, the U.S. Department of War, and federal agencies. Her appointment comes as Knox continues to grow its work helping bridge the gap between American innovation and the warfighters and government agencies that depend on it. "American innovators stand at the leading edge of what is possible. Delivering their technologies into the hands of our federal, state, and local governments, as well as the warfighter, is essential to build best-in-class systems and preserve America's advantage," said Glauber. "I'm honored to partner with this team to open this market to our technologists, support our government institutions, and help build what's next for Knox." "Knox exists to unlock access to cutting edge technology for the U.S. Government and Pentagon, without compromising security," said Irina Denisenko, CEO of Knox Systems. "Few people understand that mission - and what it takes to make it real - as deeply as Melissa. She has spent her career at the intersection of technology and national security, helping bring cutting-edge capabilities to the people and institutions that need them most. I couldn't be more excited to have her help lead Knox as we open the government market to the next generation of American innovators." Prior to joining Knox, Glauber was the founding marketing hire and Head of Marketing and Communications at Onebrief. Before that, she was the first demand generation hire at Palantir Technologies, where she notably led marketing for the company's defense business and established its first technical product marketing function. Earlier in her career, Glauber led marketing at financial services and security organizations.

Associated Press

Jul 7th, 2026

Onebrief's AtomEngine gets DoW Top Secret authorisation for planet-scale wargaming

Onebrief announced that its AtomEngine wargaming and simulation platform has received Department of War Impact Level 5, Impact Level 6, and Top Secret authorizations. The platform now offers full feature parity across all three major DoW operational networks. The authorization enables Combatant Commands and Service Components to use AtomEngine across different classification levels without deployment limitations. Users can participate in exercises from any location, eliminating the need to travel for weeks-long sessions. AtomEngine allows operators to simulate all five domains at planet scale within a unified platform. Key capabilities include movement, manoeuvre, fires modelling, multi-theatre operations, advanced logistics simulation, and five-domain integration across air, land, sea, space, and cyber. The deployment was enabled through Second Front's Game Warden platform. Onebrief was recently named one of FastCompany's Most Innovative Companies for 2026.

Business Wire

May 14th, 2026

Onebrief names Second Front as preferred deployment partner following rapid DAF CLOUDworks deployment.

Onebrief names Second Front as preferred deployment partner following rapid DAF CLOUDworks deployment. Expanded partnership unlocks new capabilities for the Joint Force HONOLULU-(BUSINESS WIRE)-Onebrief today announced an expanded partnership with Second Front Systems following the successful migration of all users at the Secret classification level to the Department of the Air Force (DAF) CLOUDworks environment. "Our transition to DAF CLOUDworks, deployed through our trusted partner, Second Front, marks a pivotal advancement in delivering secure cloud scale infrastructure for military planning." - Grant Demaree, Onebrief CEO Share At a time when military advantage increasingly depends on software and AI, this partnership reflects an important example of the capability to deliver mission software at operational speed and keep it secure over time. The migration establishes a secure, high-performance foundation for Onebrief to deliver agentic AI, advanced wargaming, and real-time decision intelligence to commanders across the globe. "Our transition to DAF CLOUDworks marks a pivotal advancement in delivering secure cloud scale infrastructure for military planning," said Grant Demaree, Chief Executive Officer of Onebrief. "By deploying through our trusted partner, Second Front, we have significantly strengthened the speed, resilience, and scalability of our platform, ensuring America's warfighters maintain uninterrupted access to mission-critical planning tools worldwide. This infrastructure evolution builds on recent milestones, including our acquisition of Battle Road Digital and our acceptance into the U.S. Army's Next Generation Command and Control (NGC2) environment." Onebrief's architecture and infrastructure, now in the Air Force Research Laboratory (AFRL) managed DAF CLOUDworks environment, has been modernized to meet the escalating operational and performance demands of Combined Joint All-Domain Command and Control (CJADC2). This provides significant improvements in security, availability, and performance, along with access to enhanced hardware and cloud services from AWS and Microsoft Azure. The migration deepens a longstanding partnership between Onebrief and Second Front Systems, whose Game Warden platform accelerates the authorization and deployment of software across classified and unclassified government networks. Migration of Onebrief's Top Secret instance is now underway as the next phase of the expanded partnership. Onebrief maintains authorization at IL5, IL6, and Top Secret classification levels. By leveraging DAF CLOUDworks' secure and compliant cloud environment, Onebrief can deliver new capabilities, including advanced AI-enabled workflows, agentic planning tools, and expanded wargaming and simulation features, at accelerated timelines. What previously required months of staging, testing, and manual deployment can now be executed at the pace of modern missions, while maintaining strict adherence to Department of War security requirements. "Onebrief is setting the bar for what modern operational software looks like inside the Department of War," said Tyler Sweatt, CEO of Second Front Systems. "Their decision to make Second Front its preferred deployment partner reflects a broader shift we're seeing across government: mission teams expect commercial software to deploy at operational speed without compromising security or trust." For Onebrief's customers, the migration delivers immediate operational advantages, including seamless interoperability across combatant commands worldwide, and expanded capacity for AI-powered planning and decision support. All collaboration capabilities, user credentials, and custom data fields were preserved through the transition without generating friction for operational planners. About Onebrief Onebrief is an AI-powered platform that enables commands to optimize workflows and transform operations, and was recently named one of FastCompany's Most Innovative Companies for 2026. Designed for the military, this foundational system enables the military to generate superhuman outputs: brilliant decisions, split-second coordination, and distributed collaboration. Learn more at onebrief.com. About Second Front Systems Second Front Systems (2F) is a public-benefit software company powering software for the free world. We eliminate the friction that slows innovation, enabling faster, more secure development and deployment of software across government and regulated networks. Built by national security veterans and backed by top-tier venture capital, our platform is trusted by the world's leading organizations to cut deployment timelines from years to weeks. We move fast, solve hard problems, and deliver trusted capabilities where they're needed most. Our work strengthens global security and gives the United States and its allies a lasting competitive advantage. Learn more at secondfront.com.

Onebrief

Feb 6th, 2026

Onebrief Expands Leadership Team with TechVeteran Cory Ondrejka

Onebrief expands leadership team with techveteran Cory Ondrejka. February 6, 2026 HONOLULU (Feb. 3) - Onebrief, the operating system for modern command, today announced that it has hired Cory Ondrejka as Chief Technology Officer (CTO). Ondrejka brings to Onebrief more than 30 years of experience inventing and delivering new technologies while leading large engineering teams, including at Google and Meta. As CTO, Ondrejka will lead Onebrief's engineering organization. He will lead the expansion of Onebrief's artificial intelligence-driven support capabilities and integrate advanced wargaming, modeling, and simulation tools through Onebrief's acquisition of Battle Road Digital. This will bring together operational planning, wargaming, and simulation within the Onebrief platform, creating a single, unified environment for military command. He will focus on making these tools intuitive and seamless, enabling teams to plan, test, and adapt at superhuman speeds. "Over the last three decades, Cory has been involved in some of the most important shifts in modern technology," said Onebrief CEO Grant Demaree. "He understands how to turn new ideas into trusted systems. Cory has already been deeply involved in its work strengthening Onebrief's AI Assist capabilities and integrating Battle Road Digital's best-in-class simulation technologies into its platform. His leadership is critical to its efforts to strengthen and scale this platform. He is the right person to lead its technology. "Joining Onebrief feels like a homecoming," said Ondrejka, a graduate of the United States Naval Academy. "The team is solving real problems for military planners, by incorporating AI into a platform that unites planning and wargaming in one unified system. As we integrate Battle Road into the platform, I'm looking forward to continuing the work of building technology that our nation's military leaders can trust when it matters most." Ondrejka has held senior leadership roles across both early-stage companies and some of the world's largest technology organizations. As vice president of Google Experience, Ondrejka served as Google CEO Sundar Pichai's technical strategy advisor and led engineering teams of more than 1,500 people. His responsibilities included improving core consumer technologies and helping teams apply AI across widely used products. Ondrejka also served as vice president of Mobile Engineering at Meta during the pivotal period when Facebook was shifting from a desktop-focused product to a mobile-first platform. As a leader at Meta during this transformation, he created the technology and product experience that enabled Meta to experience explosive growth both before and after its IPO in 2012. Previously, Ondrejka served as CTO of SmartNews, where he led global engineering teams and drove the adoption of artificial intelligence and large language model technologies to improve content discovery, ranking, and system reliability at scale. Earlier, he was the co-creator and CTO of Second Life, the pioneering virtual world developed at Linden Lab and named one of Time magazine's "Best Inventions" of 2002, which helped shape early thinking around shared digital spaces and online communities.

Built In

Feb 4th, 2026

Onebrief Appoints New Chief Technology Officer

Onebrief appoints new chief technology officer. Cory Ondrejka will spearhead the integration of wargaming and modeling tech following Onebrief's acquisition of Battle Road Digital. Image: Onebrief / Built In Onebrief, a company working to develop highly efficient command systems for military applications, announced the appointment of a new chief technology officer. Joining the company is Cory Ondrejka, an engineering leadership veteran from companies including Google and Meta. Ondrejka has over three decades of experience inventing and delivering new technologies. In his new role, he will spearhead the expansion of Onebrief's AI-driven support capabilities and integrate the advanced wargaming, modeling and simulation tools gained through the company's recent acquisition of Battle Road Digital. "Over the last three decades, Cory has been involved in some of the most important shifts in modern technology," Grant Demaree, Onebrief's CEO, said in a statement. "He understands how to turn new ideas into trusted systems. Cory has already been deeply involved in our work strengthening Onebrief's AI Assist capabilities and integrating Battle Road Digital's best-in-class simulation technologies into our platform. His leadership is critical to our efforts to strengthen and scale this platform."