Senior Fullstack Engineer for Marketplace

DXC Luxoft; United States; Remote; USD 150,000 - 190,000; Full time

Job summary

Luxoft is building a platform that lets companies create marketplaces to connect members with providers and book appointments. You’ll craft embeddable widgets, a questionnaire and booking flows, and the API behind them across web components, a preview app, and a remote MCP server.

This is a hands‑on, AI‑native role where you’ll leverage AI coding tools daily while maintaining quality, security, and compliance with PHI.

Qualifications

• 6+ years of full-stack engineering shipping production web apps.
• Experience building embeddable widgets or SDKs that run inside other products.
• Strong TypeScript and React, plus backend Python (FastAPI).
• Expertise in web embedding: custom elements, Shadow DOM, iframe sandboxing, CSP, postMessage.
• REST API design with OpenAPI; GraphQL a plus.
• Knowledge of OAuth 2.0, OpenID Connect, and SSO.
• Experience with PHI/PII under HIPAA.
• Daily use of AI coding tools; ensure AI-assisted code is correct and secure.
• You take ownership and drive work to landed delivery.

Responsibilities

• Build embeddable widget as web components or iframes with style isolation and CSP compatibility.
• Develop questionnaire and booking flows, white-label theming, and the preview app to WCAG 2.1 AA.
• Implement endpoints in Python services and tenancy/partner authentication.
• Generate SDKs from the OpenAPI contract; write developer docs and sandbox experiences.
• Ensure proper handling of PHI; write tests; support CI/CD and incident response.

Skills

Full-stack engineering

Embeddable widgets

TypeScript & React

Python (FastAPI)

Web platform embedding

OpenAPI design & SDK generation

OAuth2 / OpenID Connect / SSO

PHI handling / HIPAA awareness

AI coding tools

Ownership of delivered results

Tools

FastAPI

OpenAPI

SDK generation

Job description

Project description

We're building a platform that companies use to create marketplaces that help people find the right kind of provider and book an appointment. Payer and employer partners deliver it to their members inside their own sites and apps, through embeddable experiences, SDKs, an API, andan MCP server.You'll build those surfaces and the API behind them. The work spans the embeddable widget clients place on their sites, the preview app that demonstrates it, the questionnaire and booking flows, SDKs, and a remote MCP server.This is a hands‑on, AI-native role: you'll use coding agents and reusable AI skills every day to ship faster without trading away quality or security.

Responsibilities

• - Build the embeddable widget as web components or iframes, with style isolation, Content Security Policy compatibility, a postMessage protocol, and versioning that won't break partner pages.- Build the questionnaire and booking flows, white-label theming, and the preview app, to WCAG 2.1 AA.- Implement endpoints in the shared OpenAPI contract, in Python services, including tenancy and partner authentication.- Generate SDKs from the OpenAPI contract, write developer documentation, and build the sandbox experience for partner developers.- Ensure proper handling of PHI.- Write unit, integration, and end-to-end tests, ship through CI/CD, monitor what you build, and support incident response.

SKILLS

Must have

• - 6+ years of full-stack engineering experience shipping production web applications.
• - Experience building embeddable widgets, third‑party‑hosted web components, or SDKs that run inside other companies' products.
• - Strong TypeScript and React, plus backend services in Python (e.g., FastAPI).
• - Command of the web platform for embedding: custom elements and Shadow DOM, iframe sandboxing, Content Security Policy, and postMessage.
• - REST API design with OpenAPI, including SDK generation from specs. GraphQL experience is a plus.
• - Practical knowledge of OAuth 2.0, OpenID Connect, and SSO.
• - Experience working with PII and/or PHI under HIPAA.
• - Daily use of AI coding tools like Claude Code, with the judgment to keep AI‑assisted code correct, tested, and secure.
• - You drive work to landed, not merged, and you own the result.

Nice to have

• - Experience in healthcare technology and working PHI under HIPAA.
• - Familiarity with FHIR, especially rendering FHIR SDC / Questionnaire resources, and with SMART on FHIR.
• - Experience building MCP servers or other LLM tool integrations.
• - Experience with micro‑frontend architectures.
• - Experience with scheduling or booking products.
• - Experience with GraphQL or product analytics governance.