Senior Modeling & Simulation; S&M Engineer

At Kepler Communications, we’re not just imagining the future of on‑demand space connectivity – we’re leading it! We provide real‑time Internet access for space‑based assets, enabling a new era of data‑driven exploration and innovation. With 33 satellites launched to date, Kepler operates the first commercial optical data relay constellation, delivering continuous space communications with advanced on‑orbit compute and hosted payload capabilities.

Industry‑leading technology is only part of the story. What sets Kepler apart is our team: bold thinkers, skilled builders, and passionate problem‑solvers who thrive on pushing the limits of what’s possible in space. We believe great ideas come from diverse perspectives, and we’re committed to creating an environment where you can grow, lead, and make a global impact.

If you’re ready to reach higher, move faster, and do work that shapes the future space economy, this is your launchpad. Come build the future with Kepler!

• Competitive compensation with a robust equity plan to share in our success.
• Comprehensive coverage for health, dental, and vision insurance – including dependents.
• Unlimited vacation, supportive parental leave policy, and company‑wide holiday shutdown.
• Semi‑annual company‑wide parties and frequent in‑office team events.
• Relocation packages available for approved roles.
• $1,500 annual professional development fund to support your growth.
• Fully stocked Toronto office kitchen with snacks, drinks, games and top‑notch kitchen appliances.
• Town halls, celebration calls, and company‑wide events to stay connected and engaged.
• We’re a certified Great Place to Work® for five years in a row.

As a Senior Modeling & Simulation (M&S) Engineer, you will develop models, tools, and simulations of next‑generation space systems. The products you develop will form the backbone of a high‑performance space systems team, aligning requirements and specifications from early mission analysis through spacecraft design, manufacturing, and in‑space operations.

You will work with subject‑matter experts across space systems engineering, flight software, manufacturing, and mission operations to continuously improve system models and digital twins. Applying modern software development practices and technology, you will deliver scalable solutions that enable rapid mission analysis and superior technical decision‑making. You will be a force‑multiplier within the Solutions Architecture team, empowering rapid development and deployment of next‑generation spacecraft, high‑speed optical communications networks, and space technology.

The ideal candidate possesses experience developing high‑quality, scalable software systems within a small cross‑functional team. You enjoy learning from subject‑matter experts across a broad range of technical domains, and can distill complex systems concepts into concise, elegant solutions. You love to experiment, prototype, and use new tools and technology—including AI—to learn, grow, and improve. Success in this role requires creativity, curiosity, pragmatism, and collaboration.

• Create reusable models, tools, and simulation frameworks that enable engineers to rapidly analyze new mission concepts and payload opportunities.
• Collaborate with subject‑matter experts to model behavior and interactions between spacecraft subsystems, payloads, ground systems, and operational concepts.
• Develop simulation capabilities supporting optical imaging payloads, RF payloads, communications payloads, ISR missions, and future commercial payload opportunities.
• Validate digital twins and models against in‑space operational data.
• Develop tools for documentation generation, manual user data analysis, continuous integration testing, and automated data analysis and validation.
• Provide training for users on usage and best practices of simulation tools.
• Balance and continuously improve simulation performance and fidelity.

• Bachelor’s degree in Software Engineering, Computer Science, Computer Engineering, Systems Engineering, Aerospace Engineering, Physics, Applied Mathematics, or a related technical discipline.
• 7+ years of…