Senior Front End Engineer - Avaya Infinity Platform

Senior Front End Engineer - Avaya Infinity Platform

Avaya is an enterprise software leader that helps the world's largest organizations and government agencies forge unbreakable connections. The Avaya Infinity™ platform unifies fragmented customer experiences, connecting the channels, insights, technologies, and workflows that together create enduring customer and employee relationships. We believe success is built through strong connections – with each other, with our work, and with our mission. At Avaya, you'll find a community that values your contributions and supports your growth every step of the way.

Job Description We're building Avaya Infinity, a cloud-native real-time communication platform powering digital contact centers at scale. The frontend surfaces agent-facing real-time UIs, admin and configuration interfaces, a shared design-system library, and client SDKs — all serving customers who depend on these tools for every live interaction with their own users. Reliability is the #1 feature of this product. When our platform goes down, our customers can't talk to theirs. As a Senior Front End Engineer, you'll own features end-to-end: from architecture and implementation through testing, deployment, and production reliability. You'll shape technical direction, mentor engineers on the team, and work closely with product and design to ship software that is rock-solid, low-latency, and performant at scale while meeting strict accessibility standards. This is a hands-on senior IC role with leadership expectations — not a manager track.

What You'll Do

• Design and build performant, accessible SPAs for real-time contact center workflows (agent desktops, supervisor dashboards, configuration tools) where latency and throughput directly impact customer experience
• Contribute to and maintain a shared component library / design system used across product teams
• Write well-tested, production-grade TypeScript — both in React on the frontend and Node.js microservices where needed
• Build for reliability first: design features that degrade gracefully, handle network instability, and perform consistently under load
• Own production readiness: structured logging, metrics, alerting, and incident response for the services you ship
• Profile, measure, and optimize rendering performance, memory usage, and network efficiency in data-intensive real-time UIs
• Participate in architecture decisions and advocate for sustainable, well-documented patterns
• Document feature designs, technical decisions, and production troubleshooting playbooks so the team can operate and evolve systems without single points of knowledge
• Mentor other engineers through code review, pairing, and technical guidance
• Integrate AI-assisted development tools thoughtfully — using them to accelerate delivery while applying engineering judgment to the output

Our Current Stack React 18/19, TypeScript, Redux Toolkit / RTK Query, Vite, React Router, Mantine, CSS Modules, Vitest, Playwright, Node.js / Express / Prisma, Kafka, Redis, PostgreSQL, Docker, Kubernetes, GitHub Actions, Argo CD, Azure.

What We're Looking For

Must Have

• 7+ years of professional software engineering experience, with 5+ years focused on frontend development using React and TypeScript
• Deep understanding of component architecture, performance optimization, and modern rendering patterns
• Reliability-first engineering — you build stable, resilient features and treat every edge case, error state, and failure mode as a first-class concern
• Performance and scale awareness — experience profiling and optimizing for latency, throughput, memory efficiency, and rendering performance in data-intensive UIs
• 2+ years of real-time UI experience — you've built interfaces powered by WebSockets, streaming data, or similar and understand the state management and performance challenges that come with them
• Accessibility expertise — practical experience implementing WCAG 2.2 AA: ARIA patterns, keyboard navigation, live regions, and automated a11y testing
• Strong testing discipline — unit, integration, and end-to-end testing are part of how you work, not an afterthought (e.g., Vitest/Jest, Testing Library, Playwright)
• 2+ years of production ownership mindset — you've operated what you've built, responded to incidents, and improved reliability based on what you learned
• Technical mentorship — 2+ years of demonstrated ability to raise the bar for a team through code review, architectural guidance, and knowledge sharing
• Excellent written and verbal communication — you can articulate technical decisions clearly to engineers, product managers, and stakeholders alike, and you default to writing things down

Valuable but Not Required

• Experience with design-system tooling (Storybook, shared component libraries, theming systems)
• Rich content integrations: embedded editors, data grids, canvas/diagram rendering
• 1–2 years of backend fluency with Node.js microservices, message brokers (Kafka), caching layers (Redis), or relational databases
• Familiarity with OAuth 2.0 / OIDC authentication flows
• 1+ years of cloud platform experience (Azure preferred), containerization (Docker/Kubernetes), and CI/CD pipeline design (GitHub Actions, GitOps)
• Contract testing, API mocking, or integration testing with tools like PACT, MSW, or Testcontainers
• Internationalization and localization at scale (i18n frameworks, RTL support, multi-locale workflows)
• Feature flagging and experimentation platforms
• Familiarity with SRE principles — error budgets, SLOs/SLIs, fault containment, capacity planning, and post-incident review

What Success Looks Like

• First 90 days: You've shipped meaningful, stable features, navigated the codebase confidently, and built trust with the team through quality contributions and solid code review.
• First 6 months: You're influencing technical decisions, driving improvements to reliability, performance, or developer experience, and actively mentoring at least one other engineer.
• First year: You're a go-to technical leader on the team — peers seek your input on design decisions, and the systems you've built run reliably at scale in production.

The pay range for this opportunity is from $128,500 to $173,000 + bonus potential + benefits. This range represents the anticipated low and high end of the salary for this position. Actual salaries will vary and are based on factors such as a candidate's qualifications, skills, competencies.