Senior Application Engineer

Commonwealth Fusion Systems

190

Milpitas, CA, United States

Posted on: 2025-06-18

Category: renewables

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Employment type:

Full time

Experience required:

Senior

Salary

Salary not provided

About the company:

Commonwealth Fusion Systems (CFS) has the fastest, lowest cost path to commercial fusion energy.

CFS is collaborating with MIT to leverage decades of research combined with new groundbreaking high-temperature superconducting (HTS) magnet technology. HTS magnets will enable compact fusion power plants that can be constructed faster and at lower cost.

The mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. CFS has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by the world’s leading investors, CFS is uniquely positioned to deliver limitless, clean, fusion power to combat climate change.

If you are interested in joining our team, check out cfs.energy/careers for more information.

About Commonwealth Fusion Systems:

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.

Combining decades of research, top talent and new technologies, we’re designing and building commercially viable fusion power plants. And working with policymakers and suppliers to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised over $2 billion in capital – more than any other fusion energy company in the U.S.

Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team.

If that’s you and this role fits, we want to hear from you.

Join the power movement as a Senior Application Engineer

CFS is seeking an exceptional applications engineer with Mendix experience to join our Information Systems team to design, develop, and maintain software systems that support the mission of transition to fusion energy. You will bring deep technical expertise and a team-oriented approach to bear as you implement systems that meet the needs of our business. This unique position is perfect for individuals with technical prowess that want to have an impact on the important mission of energy abundance.

Mendix is an application development platform using a model-driven development approach. Mendix enables developers to create applications ranging from simple web apps to complex multi-channel, microservice-based applications in a fraction of the time it takes using traditional programming languages. The visual development environment presents UI, logic, and data models in a way traditional developers and members of business lines alike easily understand. In addition, the openness and extensibility of the platform enables you to add additional functionality using your existing programming skills.

This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively, “Export Control Laws"). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.

#LI-Hybrid

At CFS, we excel in fast-paced environments, driven by our values of integrity, execution, impact, and self-critique. As we grow, we’re eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.

We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law.

What you'll do:

Work closely with cross-functional teams using agile principles to deliver solutions that make a positive impact on the business

Collaborate with business partners throughout the application development lifecycle to prototype, create, iterate, and deploy apps

Help business developers to create and maintain apps with quality and consistency by using your existing programming experience to share best practices

Design scalable application architectures to support new business models and products

Build apps using Mendix platform and low-code development tools

Extend low-code development tools and applications by coding reusable front-end components and back-end integration modules

Collaborate with other software engineers/Data engineers to build or use APIs to exchange data between the apps and other software systems

Review functional requirements and draft implementation plans

Work with internal clients to debug, reproduce, document, and fix support problems for production systems

Perform code reviews on colleagues' contributions to the codebase

Participate in agile ceremonies such as standup meetings and pointing discussions

Bring technical analysis to discussions with internal clients, project managers, and other software engineers

What we’re looking for:

Bachelor's degree in an Information Technology related field or equivalent experience in application engineering (candidates from other disciplines that have 8 or more years of extensive work experience in software development are also encouraged to apply)

Proven expertise with relational databases, including PostgreSQL, MySQL, Redshift, or their equivalents

Extensive experience with leading full-stack web frameworks, e.g. Spring/Java or Django/Python (experience in JavaScript, HTML and CSS front-end development, will be taken into account)

Extensive senior-level expertise in Web Services, REST APIs, API integrations

Robust, hands-on experience in software design, architecture, app security, and performance optimization at a senior level

Cross-functional collaboration and communication experience

Strong hands on SQL experience

Project management

Great numerical and analytical skills

Possess Excellent problem-solving skills

Have attention to detail and excellent communication skills, both written and verbal to provide updates on Applications and projects status

Have an agile mindset to provide solutions quickly with an incremental value to customers

Bonus points for:

2-3 years of Mendix development experience and with Mendix Advanced Certification

Experience with Mendix Application Testing Suite (ATS)

Energy-related professional experience

Ability to communicate and facilitate technical discussions between business analysts, traditional software engineers, product owners, Mendix developers, and others

Experience with integration tools

Experience as data analyst/business analyst

Familiarity with Cloud centric systems

Must-have requirements:

Perform activities such as typing, standing, or sitting for extended periods of time

Willingness to occasionally travel or work required nights/weekends/on-call

Work in a facility that contains industrial hazards including heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, high current, pressure systems, and cryogenics

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