Software Engineer
This posting asks for U.S. citizenship.
About the role
Epsilon3 is a multi-product operations management platform revolutionizing the way teams build, launch, and operate spacecraft and other advanced hardware systems.
Launched in 2021, our company is led by engineers from SpaceX, Google, and NASA, who have experience supporting over 100 space missions. Innovative teams at Blue Origin, Rocket Lab, Axiom Space, Firefly Aerospace, and many others depend on our web-based (SaaS) solutions to plan and track high-stakes procedures. We raised a $15M Series A funding round led by Lux Capital, Y Combinator (YC S21), and other world-class investors.
We're looking for Software Engineers who are interested in space exploration and passionate about building scalable, reliable software. You will be responsible for creating delightful user experiences that solve very complex problems. We are currently using technologies such as Node.js, React, Llama, Postgres, AWS GovCloud, Docker, and Kubernetes, and we expect our stack to evolve over time as we scale our solutions and approach.
This is an impactful role within a fast-paced startup. The ideal candidate is someone who has experience designing and implementing software systems from requirements to production and deployment.
The Technical Challenges We’re Undertaking
- Real-time synchronization of data and user interfaces across Earth and space
- Visualization of many complex data fields
- Integration of multiple high-bandwidth data streams for real-time processing and display
- Multiple deployment environments, including cloud and on-premises
- Mission-critical security and reliability requirements
- Supporting complex workflows and detailed tracking while also maintaining intuitive and delightful user experiences
- Impactful AI/ML features that boost team efficiency and enable fast, data-driven decisions
Responsibilities
- Design, build, test, and release our web-based operational dashboards, electronic procedure tools, and a suite of specialized software solutions to support various space missions
- Create software to support simple and complex computation on datasets for decision-making and autonomous execution
- Build and deploy high-quality code on a daily basis for rapid iteration and testing with users
- Design APIs and integration solutions for various proprietary and open-source telemetry and command and control systems
- Rapidly prototype demos and proof-of-concepts for customer meetings
- Join and actively participate in customer discovery calls and technical demonstrations
- Analyze and enhance the efficiency, stability, and scalability of software systems
- Support software QA and user testing
- Assess third-party and open-source software and develop integrations
- Contribute to the growth and refinement of our engineering culture, processes, and tools
Qualifications
- 3+ years of experience as a Software Engineer
- Proficiency with TypeScript and with JavaScript frameworks like React, Vue, Angular, or Svelte
- Strong foundation in computer science concepts (algorithms, data structures, object-oriented programming, design, testing, etc.)
- Self-starter and able to navigate ambiguity and assess rapidly evolving priorities
- Strong team player with great communication skills and collaborative work ethic
- Love of learning (technical and otherwise)
- Experience at fast-growing tech startups is a plus
- Experience with Lean Startup & Agile software development methodologies is a plus
- Bachelor’s Degree in Computer Science or related field
- US Citizenship required (future security clearance may be required)
- Must be located in the United States
Perks
This full-time role includes stock options, generous PTO, health insurance, and a 4% 401k match.
Epsilon3 is an equal opportunity employer committed to diversity and inclusion in the workplace. We prohibit discrimination and harassment of any kind based on race, color, sex, religion, sexual orientation, national origin, disability, genetic information, pregnancy, or any other protected characteristic as outlined by federal, state, or local laws. This policy applies to all employment practices within our organization, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, compensation, benefits, training, and apprenticeship. Epsilon3 makes hiring decisions based solely on qualifications, merit, and business needs at the time.
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Copied from the listing Epsilon3 published, verified 30 Oct 2026.
The application
Your details, CV and LinkedIn, then 7 questions (1 written).
- 1.Other URLShort answer · optional
- 2.Do you have 3+ years of experience developing front-end code using a JavaScript framework like React, Vue, Angular, or Svelte?Yes or no
- 3.Are you a U.S. Citizen? (Required for ITAR)Yes or no
- 4.Do you live in the United States?Yes or no
- 5.Do you have a Bachelors degree?Yes or no
- 6.Which U.S. state do you currently live in?Short answer
- 7.In two sentences, please share what interests you about this role.Written answer
Taken from the application form Epsilon3 runs, verified 29 Oct 2026.
About Epsilon3
Software that helps teams plan and track complex operations.
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