United States onlyVannevar is a defense technology company building AI to deter our adversaries. In the 21st century, conflict moves at algorithmic speed and foresight equals firepower. Our agentic AI is purpose-built to compete with China—from cross-Strait conflict to gray zone coercion. Trained on the most mission-relevant datasets in defense, our technology models adversary behavior, simulates campaigns, and recommends the best course of action to decision makers. Our AI systems are some of the most trusted in the industry and actively used on the front lines of the Indo-Pacific to keep the peace and save lives.
Exceptional technology starts with exceptional people. Vannevar is a small agile team combining world-class engineers with veteran strategists who bring deep expertise in defense and tradecraft. We’re building a company defined by mission impact, user empathy, and disciplined growth. In just three years, we grew from $3M to $80M in ARR, achieved early profitability, and reached unicorn status—proving that disruption doesn’t require an ego, and staying power doesn’t mean standing still.
About the role
The Agentic AI team is building key AI-native applications as well as the platforms and libraries to embed Agentic AI across the company. We are looking for a Senior Fullstack Software Engineer to help build and deliver mission-critical capabilities into the hands of those who serve our nation.
We are working in a space that is a perfect fit for AI Agents - the process is plentiful but well specified, there is an abundance of multi-modal data, and accelerating speed to decision is the difference between winning and losing. You will work on cutting edge technical challenges that span AI, UX design, and software engineering, while also working on problems that matter.
What you’ll do
Design prototype agentic solutions.
Own the full lifecycle of building agents - prompt engineering, custom agent architectures, tool-calling, fine-tuning, guardrails, and evaluations.
Build chat and agent native applications.
Implement new features to grow our dedicated chat-first application and embed agentic assistant experiences into new applications.
Implement re-usable components to enable other developers.
Work with other engineers to build re-usable components for key patterns like contextual chat experiences, human-in-the-loop agents, and ambient agents that can be used across the Vannevar product suite.
Embed with customers and mission owners.
Dive deep into customer workflows to collect feedback, debug in the field, and iterate quickly.
Collaborate across disciplines.
Building effective AI-native applications crosses many disciplines. To build the right application you will work with AI Engineers to understand the capabilities an limitations of AI agents, designers to pick the right UX patterns for users, and product owners to solve real-world customer workflows.
What you should have
- A track record of shipping high impact, fullstack, and preferably data or AI-enabled applications
- Deep and current knowledge of AI capabilities, LLM tooling, and emerging trends.
- An excitement to work cross-functionally with other engineers, designers, and machine learning engineers
- Bias towards achieving outcomes, including willingness to step outside your immediate role to ensure mission success.
- Familiarity with relational databases (like Postgres), caching technologies (like Redis), object stores (like S3), and distributed search systems (like ElasticSearch).
- Experience with React, Typescript/JavaScript, and Python.
- Active or previous TS / SCI Clearance is a plus, but not needed.
Competitive salary
The salary range for this position is $160,000 - $200,000 + equity + 401K match. Within the range, individual pay is determined by experience, relevant education, and/or training.
What we offer
- Generous health, dental, and vision insurance.
- 100% remote first culture — you can work from anywhere in the US and all full-time employees have WeWork access.
- Unlimited PTO including competitive vacation and holiday schedules.
- Lifestyle stipends — monthly mental health, wellness fitness stipend, in-home office setup stipend and family planning assistance.
- Salary top-up during military reserve duty.
- Fully paid parental leave.
- Child and pet care reimbursement during travel.
We are committed to protecting the privacy of all applicants. Official emails from the company will come from an @vannevarlabs.com domain. Under no circumstances will a legitimate representative from our company contact you to request passwords, financial information, or other sensitive personal data. Please be vigilant of potential scams.
