Senior Staff Engineer, UI

Title: Senior Staff Engineer, UI

Location: New York, NY United States

Hybrid

Job Description:

Company description

Publicis Media Exchange (PMX) is the investment arm of Publicis Media, supercharging our agencies and clients to drive smart application of investment by leveraging scale, marketplace innovation, deeper partnerships, and intelligence. PMX is at the forefront of the converging marketplace, solving industry challenges and executing data-informed, tech-enabled media to help marketers connect with consumers in a measurable way.

Overview

We're looking for a Senior UI Engineer to help lead the technical direction of Agent Studio, Performics' flagship AI-driven workspace. You'll be a senior-level individual contributor who partners closely with product, UX, and platform leads to architect, implement, and optimize modern front-end systems that power real-time, AI-augmented experiences.

This is a hands-on, non-supervisory role - ideal for engineers who thrive at the intersection of design systems, performance, and architectural decision-making. This is a hands-on engineering role - you'll contribute directly to production code, build pipelines, and review implementations while shaping the long-term frontend architecture.

You'll shape engineering best practices, mentor developers across teams, and drive consistency across Studio's growing product surface.

Responsibilities

Core Responsibilities

• Lead the technical design, implementation, and optimization of Agent Studio's React +
• TypeScript + Next.js front-end architecture.
• Define patterns for modular component design, code reuse, and performance optimization (<500ms response time).
• Partner with backend and AI Orchestration teams to optimize real-time streaming (SSE/WebSocket) and integration flows.
• Establish coding standards, code review practices, and automated quality gates (Jest, Cypress, Playwright).
• Architect reusable front-end modules and shared libraries across Agent Studio's chat, workflow, and project modules.
• Collaborate with UX and design system teams to expand the ShadCN / Tailwind design system for conversational and dashboard components.
• Serve as the front-end architectural point of contact for AOE, DFP, and SRE charters, ensuring cohesive runtime integration.
• Implement CI/CD and observability instrumentation (GitHub Actions, DataDog) to improve developer efficiency and visibility.

Technical Leadership & Collaboration

• Mentor junior engineers through design reviews, pairing, and coaching on performance and testing strategies.
• Participate in architectural reviews and influence the evolution of OneSuite's front-end framework standards.
• Drive experimentation with emerging frameworks, SDKs, and rendering patterns (Server Components, AI SDKs).

Partner with the Engineering Manager to define sprint-level technical goals and engineering OKRs.

• Innovation & System Design
• Lead prototyping efforts for complex UX or interaction patterns (multi-agent chat, dynamic context panels, real-time analytics).
• Shape strategies for performance observability, caching, and versioned prompt or workflow interfaces.
• Contribute to post-launch monitoring, debugging, and scaling strategies for production releases.

Qualifications

Must Have

• 5-7 years of professional experience in front-end or full-stack web application development.
• Expert-level proficiency in React, TypeScript, and modern JavaScript.
• Deep understanding of Next.js, component lifecycle, and rendering optimization.
• Proven experience architecting scalable UI systems and shared component libraries.
• Strong familiarity with testing frameworks (Jest, Cypress, Playwright) and performance profiling tools.
• Experience integrating RESTful and streaming APIs (SSE/WebSocket).
• Solid grounding in accessibility, security, and responsive design principles.
• Familiarity with CI/CD pipelines and DevOps collaboration.

Nice to Have

• Experience in data-intensive or AI-augmented applications.
• Understanding of FastAPI, AWS Bedrock AgentCore, or LiteLLM frameworks.
• Exposure to observability and monitoring platforms (DataDog, CloudWatch).
• Prior experience leading architecture initiatives or framework migrations.

Core Competencies

• As a Senior Engineer, you lead through deep technical expertise and architectural influence rather than direct management.
• Technical: You drive the design and implementation of complex systems and high-impact features, setting the technical direction for Agent Studio's front-end architecture. You ensure scalability, maintainability, and performance across projects, while championing clean code practices and reusable patterns that accelerate development efficiency.
• Leadership: You provide technical guidance to peers and junior engineers, fostering a culture of excellence through code reviews, knowledge sharing, and example-driven mentorship. Though not a supervisory role, you lead through influence - shaping engineering standards and decision-making within and beyond your immediate team.
• Product Impact: Your work has measurable outcomes on both the product and its users.
• You translate business and design goals into reliable, high-performance technical solutions that directly improve user experience, product metrics, and developer productivity. You anticipate technical risks early and ensure solutions are built for long-term scalability and reliability.
• Innovation & Learning: You stay ahead of emerging frameworks, performance optimization strategies, and front-end architecture trends, introducing improvements that elevate Agent Studio's overall engineering maturity. You experiment thoughtfully, balancing innovation with stability, and help the team adopt new tools or approaches when they provide tangible value.
• Collaboration: You communicate complex technical ideas with clarity and empathy across cross-functional teams - including Product, UX, and AI Orchestration. You build consensus, align diverse stakeholders around engineering decisions, and represent frontend engineering effectively in architecture and design discussions across OneSuite charters.

Why Join Us

• Help define the technical foundation of Performics' flagship product at global scale.
• Collaborate with a multi-disciplinary team of AI, design, and data experts.
• Work in an environment that values technical depth, mentorship, and experimentation.
• Hybrid flexibility, AI-assisted dev tools, and clear growth paths into Staff Engineer or Principal Front-End Architect roles.
• Competitive compensation, benefits, and professional development program

Additional information

Our Publicis Groupe motto "Viva La Différence" means we're better together, and we believe that our differences make us stronger. It means we honor and celebrate all identities, across all facets of intersectionality, and it underpins all that we do as an organization. We are focused on fostering belonging and creating equitable & inclusive experiences for all talent.

Publicis Groupe provides robust and inclusive benefit programs and policies to support the evolving and diverse needs of our talent and enable every person to grow and thrive. Our benefits package includes medical coverage, dental, vision, disability, 401K, as well as parental and family care leave, family forming assistance, tuition reimbursement, and flexible time off.

Compensation Range: $135,375- $216,684 annually. This is the pay range the Company believes it will pay for this position at the time of this posting. Consistent with applicable law, compensation will be determined based on the skills, qualifications, and experience of the applicant along with the requirements of the position, and the Company reserves the right to modify this pay range at any time. Temporary roles may be eligible to participate in our freelancer/temporary employee medical plan through a third-party benefits administration system once certain criteria have been met. Temporary roles may also qualify for participation in our 401(k) plan after eligibility criteria have been met. For regular roles, the Company will offer medical coverage, dental, vision, disability, 401k, and paid time off. 

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