Senior Full Stack Engineer

We believe quantum computing will change everything. It will have the power to transform the foundations of giant industries that rely on intensive computation.

PsiQuantum is on a mission to build the world's first useful quantum computer, capable of delivering these transformative results.

We know that means it will need 1 million qubits, error correction, a scalable architecture and a data center footprint.

By harnessing the laws of quantum physics, quantum computers can provide exponential performance increases over today's most powerful supercomputers, offering the potential for extraordinary advances across a broad range of industries including climate, energy, healthcare, pharmaceuticals, finance, agriculture, transportation, materials design, and many more.

PsiQuantum is uniquely positioned to deliver on the promise of quantum computing years earlier than our competitors. Our architecture is based on photonics which gives us the ability to produce our components using existing high-volume semiconductor manufacturing processes, the same processes that are today producing billions of chips for telecom and consumer electronics applications.

Since photons don't feel heat, we can take advantage of existing cryogenic cooling systems, the kind that have been operating at facilities like the Stanford Linear Accelerator (SLAC).

And because photons are in fact light, they can move between subsystems at tremendous speed using standard fiber connectivity.

Our team is building a utility scale quantum computer and the software tools needed to build fault tolerant quantum applications.

We're a highly motivated and collaborative group focused on a singular goal - building the world's first useful quantum computer on the fastest path possible.

There's much more work to be done and we are looking for exceptional talent to join us on this extraordinary journey!

Job Summary :

PsiQuantum is singularly focused on the delivery of a useful utility-scale fault tolerant quantum computer. In addition to deploying a world-class quantum computer, we aim to deliver a world-class quantum user experience to both our external customers and internal developers.

This will require the development of a novel, production-grade software system which will enable the delivery of both external enterprise products and internal quantum toolchains to interact with multiple generations of our system.

We are seeking an experienced Senior Full Stack Engineer with 7+ years of expertise in modern web development technologies, including professional experience with at least one of the following frameworks : , Vercel, or SvelteKit.

This role requires strong fluency in JavaScript and TypeScript, along with a solid understanding of HTML5, CSS3 / 4, and modern web design principles.

You will work on building Single Page Applications (SPAs) with a focus on security best practices, such as authentication and authorization, while ensuring integration with legacy and bespoke codebases, as well as third-party vendors.

In this role, you will take ownership of frontend architecture and development, ensuring performance, scalability, and security.

You will also be responsible for writing modular, well-tested code, with a strong emphasis on unit and integration testing.

Collaboration is key in our startup culture, and you will work closely with cross-functional teams to design new features and optimize existing ones.

Familiarity with Git, terminal usage, and CI / CD pipelines is a plus, as you will contribute to maintaining a smooth development workflow.

If you are passionate about frontend development, love working with cutting-edge technology, and enjoy contributing to product development in a dynamic startup environment, we'd love to hear from you.

Responsibilities :

Architect, design, and build frontend applications using modern tooling, ensuring scalable, secure, and high-quality code.

Design, develop, and maintain frontend applications written in Sveltekit.

Ensure performance, scalability, and adherence to web design principles (HTML5, CSS3 / 4) across all frontend projects.

Write well-structured, maintainable, and thoroughly tested code in JavaScript and TypeScript.

Work with stakeholders to understand, plan and document work as needed (e.g., Jira, Asana, etc.)

Implement security best practices with a focus on authentication, authorization, and data protection.

Collaborate with product teams in design sessions and contribute to feature development.

Work with both modern and legacy codebases, ensuring smooth integration with external vendors.

Lead efforts in unit and integration testing to maintain robust and reliable frontend code.

Utilize Git and terminal commands as part of day-to-day development workflow.

Contribute to the development and improvement of CI / CD pipelines for automated builds, testing, and deployment.

Mentor junior engineers, fostering best practices and driving continuous improvement.

Experience / Qualifications :

Degree in Computer Science or equivalent experience shipping products to production.

7+ years of frontend development experience, particularly with React, Next.js, SvelteKit, and Vercel.

Strong fluency in JavaScript and TypeScript, with a deep understanding of HTML5, CSS3 / 4, and modern web design principles.

Fluency in Python would be an asset, but not a requirement

Experience delivering modular, maintainable, and tested code in React, Next.js, or SvelteKit.

Solid understanding of unit and integration testing methodologies.

Strong knowledge of security best practices, particularly in authentication and authorization.

Experience working with both legacy and bespoke codebases and integrating with external vendors.

Understands and can implement common design patterns

Proficiency with Git and terminal usage in a development environment.

Familiarity with CI / CD pipelines and automation for testing and deployment.

Proven ability to work in fast-paced startup environments.

Excellent communication and collaboration skills, working effectively with cross-functional teams.

A proactive problem solver with a focus on scalability and performance optimization.

The range below reflects the minimum and maximum target range for new hire base salary across all US locations. Actual compensation may vary outside of this range and is dependent on various factors including but not limited to a candidate's qualifications including relevant education and training, competencies, experience, geographic location, and business needs.

Base pay is only one part of the total compensation package. Full time roles are eligible for equity and benefits. Base pay is subject to change and may be modified in the future.

For a fully qualified candidate, the expected base pay range is :

Base Pay Range

$172,000 $205,000 USD