Senior Full Stack UI Engineer

Quantum; Centennial (CO); On-site; USD 130,000 - 190,000; Full time

Job summary

Quantum in Colorado is seeking an experienced Senior Full-Stack Engineer to design, architect, and build modern web applications using React, TypeScript, and Vue. You will shape BFF layers, REST/GraphQL APIs, and data models to power UI delivery.

Collaborate with UX and product teams, ensure performance, accessibility, and security, mentor engineers, lead design reviews, and drive CI/CD and testing across the stack.

Qualifications

• 8+ years of professional experience building full-stack, user-facing web apps with ownership of production services.
• Hands-on React in production; strong JS/TS/HTML5/CSS3 skills.
• Experience designing UI-focused back-end services with REST/GraphQL.
• Relational DBs (PostgreSQL/MySQL) and time-series DBs (Prometheus).
• Cloud, containers, orchestration, and DevOps practices; UX collaboration from Figma.
• Accessibility, cross-browser compatibility, and testing expertise.
• Strong Git, CI/CD (GitLab), and modern testing frameworks.
• Ability to lead, mentor, and influence technical direction in-office.

Responsibilities

• Design, architect, and develop modern web apps using React, TypeScript, and Vue.
• Build and maintain BFF and API services (REST/GraphQL) for UI data needs.
• Translate UI/UX designs into backend data models, APIs, and service boundaries.
• Lead architecture decisions for performance, security, and maintainability.
• Collaborate with UX/product teams to implement reusable UI components and design systems.
• Optimize UI performance, accessibility, and cross-browser compatibility.
• Contribute to shared libraries across React and Vue ecosystems.
• Architect and maintain AWS-based back-end infra (EC2, RDS, SQS, SES, ECR) with Docker/Kubernetes.
• Improve API performance via caching and data transformation; respond to incidents.
• Implement authentication/authorization with identity platforms and SSO.
• Design/optimize relational data schemas and caching layers; ensure data integrity.
• Lead code reviews, establish standards, and mentor team members.
• Drive automated testing, CI/CD discipline, and reduce tech debt.

Skills

React

TypeScript

Vue

JavaScript

HTML5

CSS3

API design

Node.js

Python

PHP

Git

CI/CD

Testing

Education

Bachelor's degree in Computer Science/Engineering

Tools

PostgreSQL

MySQL

Redis

Prometheus

Docker

Kubernetes

GitLab CI/CD

Laravel (optional)

Job description

• Design, architect, and develop modern web applications using React, TypeScript, and Vue.
• Build and maintain Backend-for-Frontend (BFF) and API services (REST and/or GraphQL) that aggregate, adapt, and optimize back-end data for UI consumption.
• Translate UI/UX requirements into efficient back-end data models, API contracts, and service boundaries.
• Define and evolve front-end and BFF architectures with a focus on performance, scalability, security, and maintainability.

Key Responsibilities

Full-Stack Architecture & Development

• Design, architect, and develop modern web applications using React, TypeScript, and Vue.
• Build and maintain Backend-for-Frontend (BFF) and API services (REST and/or GraphQL) that aggregate, adapt, and optimize back-end data for UI consumption.
• Translate UI/UX requirements into efficient back-end data models, API contracts, and service boundaries.
• Define and evolve front-end and BFF architectures with a focus on performance, scalability, security, and maintainability.

Front-End & Design System Collaboration

• Collaborate with UX and product teams to translate Figma designs into high-quality, reusable UI components aligned with shared design systems and component libraries.
• Drive UI performance optimization, accessibility, and cross-browser compatibility.
• Contribute to and consume shared component libraries across React and Vue ecosystems.

Cloud Infrastructure & Reliability

• Architect and maintain back-end infrastructure in AWS (EC2, RDS, SQS, SES, ECR) and containerized environments (Docker, Kubernetes).
• Own and improve API performance through caching strategies, query optimization, and efficient data transformation.
• Respond to production incidents in a timely manner and contribute to observability, monitoring (Prometheus/Grafana), and reliability initiatives.

Back-End Security

• Integrate authentication and authorization using identity platforms such as Keycloak, including SSO and role-based access control.
• Build secure, maintainable server-side functionality and contribute to security tooling across UI and back-end layers.

Data Management

• Design, evolve, and optimize relational database schemas (PostgreSQL, MySQL) and caching layers (Redis) in support of UI-centric use cases.
• Ensure data consistency, integrity, and performance across services.

Technical Leadership

• Lead code reviews, establish best practices, and ensure consistent engineering standards across front-end and back-end layers.
• Mentor junior and mid-level engineers and contribute to raising the overall quality bar of the team.
• Participate actively in design reviews, sprint planning, and cross-team technical discussions.

Quality & Testing

• Proactively identify technical debt and lead refactoring or modernization efforts.
• Champion high code quality through thoughtful design, automated unit/integration/e2e testing, and CI/CD pipeline discipline.

Qualifications

Required

• Experience:8+ years of professional experience building full-stack, user-facing web applications, including ownership of production services.
• Front-End:Strong hands-on experience with React in production environments; advanced proficiency in JavaScript, TypeScript, HTML5, and CSS3.
• Back-End & APIs:Experience designing and implementing UI-focused back-end services (Node.js, Python, PHP, or similar) using REST and/or GraphQL.
• Databases:Strong experience with relational (PostgreSQL, MySQL) and time series databases (Prometheus).
• Cloud & DevOps:Experience working in cloud environments with containerization and orchestration.
• UX Collaboration:Experience working closely with UX teams and implementing designs from Figma or similar design tools.
• Accessibility:Strong understanding of responsive design, accessibility standards, and browser compatibility.
• Tooling & Testing:Solid experience with Git, GitLab CI/CD, and modern automated testing frameworks.
• Debugging:Strong debugging and troubleshooting skills across front-end, API, and data layers.
• Ability to work effectively in a collaborative, in-office engineering environment.

Preferred

• Experience with the Laravel framework in PHP.
• Familiarity with identity/auth platforms and API security patterns.
• Background in storage, infrastructure, or data-intensive/enterprise-scale systems.

Education

• Bachelor’s degree in Computer Science, Computer Engineering, or a related field (or equivalent practical experience).

Soft Skills

• Strong technical leadership and problem‑solving skills.
• Clear and effective communication with both technical and non‑technical stakeholders.
• High attention to detail and a strong commitment to code quality.
• Ability to influence technical direction and inspire best practices across the team.
• Comfortable balancing hands‑on development with mentorship and technical leadership.