Staff Full Stack Engineer - Pay-i

Praxis, Inc.; Seattle (WA); Hybrid; USD 120,000 - 180,000; Full time

Benefits offered by this job

Health insurance

Discretionary time off

Growth opportunities

Fast-paced environment

Mentorship from founding team

Job summary

Pay-i, based in Bellevue, WA, is hiring a Staff Full Stack Engineer to join a tight-knit team building our GenAI ROI platform. You will work closely with front-end and back-end engineers to deliver prototype and production-quality features for dashboards, websites, and products.

The role emphasizes scalable, secure, and performant UI, with opportunities to influence architecture and mentor junior engineers on a rapidly growing startup.

Qualifications

• 7+ years of experience and insatiable curiosity.
• Deep expertise in modern client JavaScript, HTML5, CSS, and Browser Dev Tools.
• DNS, HTTP, and OAuth2 knowledge.
• Git, Bash, Docker, and Python web server development.
• Excel at working in a fast-paced environment.
• Comfortable in ambiguous environments and defining path forward.
• Experience building external customer-facing products.
• Cloud experience (AWS, Azure, GCP).
• Experience building SPA/PWA in JavaScript.
• Full-stack engineering capabilities.

Responsibilities

• Work with front-end and back-end engineers to rapidly deliver prototype and production-quality products.
• Create high-quality, intuitive, performant, and reliable user experiences.
• Ensure high-quality graphics standards and brand consistency across all touchpoints.
• Implement responsive design for multiple devices and screen sizes.
• Refactor code to improve performance, structure, and readability.
• Utilize Redux and Context API to manage application state.
• Apply front-end security best practices, including input validation.
• Implement unit, integration, and end-to-end tests.
• Participate in peer code reviews to maintain quality.
• Inform processes for maintainability and performance of the front-end stack.

Skills

JavaScript

HTML5

CSS

Browser DevTools

DNS & HTTP

OAuth2

Git

Docker

Python

Cloud platforms

SPA / PWA

Full-stack

10+ years

Highcharts

Bootstrap 5+

Tools

Redux

Context API

Job description

Staff Full Stack Engineer

About Pay-i

At Pay-i, we are solving one of enterprise AI's most critical challenges: proving ROI of GenAI investments. While global GenAI spend races towards $600B by 2028, 72% of CIOs cite measurement and forecasting as their top blocker, and only 13% of business leaders report significant enterprise-level value from GenAI. We are the only platform that transforms every model call, prompt, and agent step into CFO-grade metrics, providing enterprises the financial transparency to identify winning use cases, optimize costs, and prove impact.

Founded by ex-Microsoft leaders with 20+ years of experience each, Pay-i is a seed-stage company backed by five venture capital firms and executive/C-suite angels from Microsoft, Twilio, Zoom, and more. If you are passionate about selling products that fundamentally change how enterprises scale their AI initiatives, join us in bringing the system of record for GenAI ROI to market.

The Opportunity

As our Staff Full Stack Engineer, you will be a crucial team member working closely with other Full Stack Engineers responsible for implementing our customer’s front-end experience. This is a unique opportunity to build with a deeply experienced team and GenAI leaders who like to innovate, experiment, and respond to customer feedback.

What You'll Do

Are you excited about building an innovative product that tackles some of the most pressing financial challenges associated with leveraging Generative AI? As our Staff Full Sack Engineer, you will play a pivotal role in our mission. Your efforts will not only shape the user experience across our dashboards, websites, and products but also lay the foundation for our future growth.

Core Responsibilities:

• Work with Pay-i's front-end and back-end engineers to rapidly deliver both prototype and production-quality products

• Create high-quality and enjoyable user experiences by building interfaces that are simple, intuitive, performant, and reliable

• Ensure high-quality graphic standards and brand consistency across all customer touchpoints

• Implement responsive design principles to ensure seamless display across various devices and screen sizes

• Refactor existing code to improve performance, structure, and readability

• Utilize state management libraries and patterns (e.g., Redux, Context API) to manage application state efficiently

• Implement front-end security best practices, such as input validation and secure coding standards

• Implement unit tests, integration tests, and end-to-end tests using appropriate testing frameworks and tools

• Perform code reviews and participate in peer code reviews to maintain code quality

• Inform our process for ensuring maintainability, quality, and performance of our entire front-end stack

What You Bring

Required Qualifications:

• 7+ years of experience, and insatiable curiosity that has only grown during that time

• Deep expertise in modern client Javascript, HTML 5, CSS, and Browser Dev Tools

• Practical protocol knowledge of DNS, HTTP, and OAuth2

• Experience with git, bash, Docker, and Python web server development

• Excel at working in a fast-paced "bring up/tear down" environment

• Comfortable working in ambiguous environments and defining the path forward

• Proven experience building external customer-facing products

• Self-directed and self-aware, you have strong opinions and a stronger work ethic

• Cloud experience (AWS, Azure, and GCP)

Preferred Qualifications:

• 10+ years of experience

• Highcharts, Bootstrap 5+

• Experience building a SPA and/or PWA in Javascript

• Full-stack engineering capabilities

What We Offer

• Top-of-the-line health insurance

• Discretionary time off

• Opportunity to grow with the company and manage a team

• Fast-paced, execution-focused environment with clear goals

• Collaboration with and mentoring from an extremely experienced founding team

Location

• Based in Bellevue, WA

• Local, in-office presence preferred

• Occasional hybrid arrangements possible

Why Pay-i?

You'll join an extremely experienced team with a unique, patented value proposition and clear goals. We're well-funded, well-connected, and set up for success—now we need the right people to execute on our vision. As one of our early technical hires, you'll have complete ownership over the front-end architecture and the opportunity to shape our engineering culture as we grow.

Pay-i is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.