Scale Engineer

Product Engineer, Product Platform (Frontend)

Frontend Engineer · Senior · Full Time

Foster City, CAUSD 200k – 300k1mo ago
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Role

What you'll do.

Replit seeks a Product Engineer to own the frontend platform architecture behind core product experiences, including application frameworks, API and data layers, testing infrastructure, and client performance. You'll work on a small, collaborative team designing platform APIs and shared primitives that enable other engineering teams to ship quickly and reliably. This role requires deep expertise in modern web stacks (TypeScript, React, Next.js, Node.js) and proven experience designing frontend architecture, managing API/data layers, and optimizing client performance at scale.

Responsibilities

  • Frontend Architecture Design and Ownership: Design and maintain sound, consistent frontend architecture including frameworks, state management, routing, and server-side rendering (SSR) vs client-side rendering (CSR) strategies. Ensure the architecture is intuitive and easy for other product teams to build upon, supporting rapid feature development while maintaining code quality and performance.
  • Platform API and Data Layer Development: Design, build, and operate reliable APIs and data layers with clear contracts, comprehensive documentation, and sensible error handling. Implement effective caching strategies and upgrade paths that other teams can adopt. Support both REST and GraphQL paradigms as needed for different product requirements.
  • Client Performance Optimization and Instrumentation: Profile real user journeys and instrumenting user-facing surfaces with comprehensive monitoring. Ship performance improvements that move key metrics. Work on identifying and eliminating latency bottlenecks in high-traffic, latency-sensitive workloads.
  • Cross-Cutting Platform Changes and Migrations: Roll out platform-wide changes safely using codemods, migration paths, and staged rollouts. Ensure backward compatibility and minimize disruption to dependent teams during architectural transitions and infrastructure updates.
  • Technical Leadership and Documentation: Set technical direction through design and architecture reviews. Document architectural decisions, operational expectations, and best practices. Communicate complex technical tradeoffs clearly to both engineering and product teams.
  • Cross-Functional Partnership: Work directly with product teams, design engineers, and DevEx team to translate friction points into reusable platform improvements. Collaborate with design teams on design system integration and with DevEx on build tooling and CI/CD improvements.
  • Testing Infrastructure and Quality Assurance: Develop and maintain testing infrastructure that keeps user-facing surfaces safe to change. Implement monitoring and observability tools that provide confidence in platform reliability and enable rapid iteration.
  • Codebase Maintainability for AI and Humans: Ensure the codebase remains easy to navigate, change, and extend, including optimization for AI coding agents. Maintain clear naming conventions, logical file organization, and comprehensive documentation that supports different development approaches.

Qualifications

What we look for.

Technical

  • Frontend Architecture Design

    Proven experience designing frontend architecture that other teams build upon, including decisions around frameworks, state management patterns, routing systems, and SSR/CSR tradeoffs. Demonstrated ability to evaluate architectural options and explain tradeoffs across user experience, correctness, delivery speed, and long-term maintainability.

  • Production Software Development

    Extensive experience shipping and operating user-facing software in production environments. Track record of designing systems that scale reliably and handling production incidents with appropriate monitoring and observability.

  • API and Data Layer Design

    Strong experience building and operating API and data layers using REST and/or GraphQL. Proficiency with error handling strategies, caching mechanisms, rate limiting, and contract definition. Understanding of data consistency, eventual consistency patterns, and their implications for client applications.

  • Client Performance Engineering

    Measured expertise in identifying and improving client-side performance through instrumentation, monitoring, and optimization. Experience with performance metrics (Core Web Vitals, Time to Interactive, etc.), profiling tools, and the ability to connect performance improvements to user experience and business metrics.

  • Modern Web Stack Proficiency

    Comfortable working with TypeScript, React, Next.js, and Node.js. Understanding of modern frontend tooling, build systems, and the broader JavaScript ecosystem. Ability to work effectively across frontend and backend domains.

  • Platform Thinking

    Experience designing shared platform primitives and abstractions that multiple teams depend on. Understanding of versioning strategies, deprecation paths, and API stability considerations. Ability to balance the needs of multiple consuming teams.

Education

  • Computer Science Degree or Equivalent

    Bachelor's degree in Computer Science, Software Engineering, or related field, or equivalent practical experience demonstrating strong computer science fundamentals. Formal education in data structures, algorithms, and systems design is valuable but not required if offset by strong professional experience.

Experience

  • Senior-Level Frontend Engineering

    Minimum 5-7 years of professional software engineering experience with at least 3-4 years focused on frontend architecture, platform engineering, or infrastructure work. Demonstrated progression from individual contributor to senior levels with scope and impact across multiple teams.

  • Architectural Decision Making

    Track record of making and defending significant architectural decisions in high-stakes environments. Experience evaluating multiple technical approaches and explaining tradeoffs to stakeholders with different technical backgrounds.

  • Large-Scale System Operation

    Experience operating systems serving significant traffic volume. Familiarity with monitoring, alerting, incident response, and continuous improvement processes for production systems.

Skills

Required

  • TypeScript

    Expert-level proficiency with TypeScript for type-safe frontend and backend development. Understanding of advanced type system features and their application to building maintainable, scalable applications.

  • React

    Deep knowledge of React including hooks, state management integration, performance optimization patterns, and component architecture. Experience building reusable component abstractions and design systems.

  • Next.js

    Strong experience with Next.js including server-side rendering, static generation, API routes, and middleware. Understanding of Next.js architecture and its use cases for building scalable frontend platforms.

  • Node.js

    Comfortable building backend services and APIs with Node.js. Experience with async programming patterns, performance considerations, and integration with databases and external services.

  • REST or GraphQL API Design

    Proven ability to design ergonomic, well-documented APIs. Experience with REST conventions or GraphQL schema design. Understanding of versioning, backward compatibility, and error handling in APIs.

  • Client Performance Optimization

    Hands-on experience measuring, diagnosing, and improving client-side performance. Familiarity with browser DevTools, performance monitoring tools, and optimization techniques like code splitting, lazy loading, and caching strategies.

  • Frontend Testing Infrastructure

    Experience building and maintaining testing infrastructure including unit tests, integration tests, and end-to-end tests. Familiarity with testing frameworks and approaches that support safe refactoring and architectural changes.

Preferred

  • Platform or Infrastructure Engineering

    Nice to have

    Background building platform layers, shared libraries, or infrastructure that multiple teams depend on. Experience designing for ease of adoption and understanding common pitfalls of platform work.

  • Monorepo Management

    Nice to have

    Experience working in monorepo environments using tools like Turborepo, Nx, or similar. Understanding of workspace configuration, dependency management across packages, and optimization strategies.

  • Build Tooling and Bundling

    Nice to have

    Familiarity with modern build tools (Webpack, Vite, esbuild, etc.) and bundling strategies. Understanding of code splitting, tree shaking, and optimization for production builds.

  • DevOps and CI/CD

    Nice to have

    Experience with continuous integration, continuous deployment pipelines, and infrastructure-as-code. Comfort with deployment strategies including blue-green deploys, canary releases, and feature flags.

  • Observability and Monitoring

    Nice to have

    Experience implementing comprehensive observability including logging, metrics, distributed tracing, and alerting. Familiarity with tools like Datadog, New Relic, or similar platforms.

  • AI-Assisted Development

    Nice to have

    Exposure to AI coding assistants and understanding of how codebase structure, naming conventions, and organization can be optimized for AI tools. Interest in designing systems that work well with both human and AI developers.

Tech stack

Languages

TypeScriptJavaScript/ES6+

Frameworks

ReactNext.jsNode.js

Databases

PostgreSQLRedis

Tools

GitFigmaDatadog or New RelicJestPlaywright or Cypress

Other

Server-Side Rendering (SSR) and Client-Side Rendering (CSR)State ManagementAPI Design PatternsCode Splitting and Performance OptimizationCodemod and Large-Scale Refactoring

Compensation

Pay and benefits.

Base·USD 200,000 – 300,000

Equity·Stock options

Benefits

  • Competitive Salary and Equity

    Competitive compensation package including salary commensurate with experience and equity stake in Replit, aligning your interests with company success and long-term value creation.

  • Comprehensive Health Coverage

    Full medical, dental, and vision insurance coverage for employees and eligible dependents, supporting overall health and wellness.

  • Retirement Planning

    401(k) program with 4% employer match (US employees only), helping build long-term financial security and retirement savings.

  • Life Insurance and Disability Coverage

    Life insurance and both short-term and long-term disability coverage providing financial protection for you and your family.

  • Paid Time Off and Parental Leave

    Flexible time off (FTO) plus paid holidays, paid parental leave, medical leave, and caregiver leave supporting work-life balance and major life events.

  • Monthly Wellness Stipend

    Monthly allowance for wellness activities and services, supporting physical and mental health outside of traditional insurance.

  • Commuter Benefits

    Commuter benefits program for in-office employees, reducing commuting costs and supporting sustainable transportation options.

  • In-Office Setup Reimbursement

    Reimbursement for office equipment and ergonomic setup for in-office employees, ensuring a comfortable and productive work environment.

  • Autonomous Work Environment

    Culture emphasizing autonomy and trust, allowing engineers to work independently and make decisions without excessive micromanagement.

  • Quarterly Team Gatherings

    Regular in-person team events and company-wide gatherings fostering connection, collaboration, and cultural alignment.

  • In-Office Amenities

    High-quality office amenities including coffee, collaborative spaces, and equipment supporting productive in-office work for Foster City-based employees.

Full posting

Original listing.

Replit is the agentic software creation platform that enables anyone to build applications using natural language. With millions of users worldwide, Replit is democratizing software development by removing traditional barriers to application creation.


Replit is a software creation platform that enables anyone to build applications using natural language. With millions of users worldwide, Replit helps more people build and ship software.


About the Team


Product Platform builds and owns the shared foundations the rest of Replit is built on: backend infrastructure, connectors, product primitives, and the frontend platform. When these foundations are solid, every other team moves faster.

This role goes deep on the frontend platform: the architecture and platform layer behind every core product surface.

The work is high-leverage and horizontal, and gives you exposure across the whole of engineering. We are a small, collaborative team that values curiosity and clear thinking over pedigree, and we care more about how you reason and build than the route you took to get here. If you like making other engineers faster, you will fit in here.


About The Role


As a Product Engineer focusing on the frontend platform, you will own the frontend architecture behind core product experiences: application frameworks, the API and data layer, testing infrastructure, and client performance. The goal is simple: product teams ship quickly and reliably on what you build.

The team’s work is guided by a few simple questions:

  • Is our core frontend architecture (frameworks, state, routing, SSR/CSR) sound, consistent, and easy to build on?

  • Is our API and data layer reliable and ergonomic, with clear contracts, sensible error handling, and effective caching?

  • Are user-facing surfaces fast and well-instrumented, with testing infrastructure that keeps them safe to change?

  • Is the codebase easy to navigate, change, and extend, including for AI coding agents?

You’ll partner closely with engineering, product, and design. You’ll also work with our DevEx team on build tooling and CI/CD, and our Design Engineering team on the design system, to plan, ship, and operate the frontend foundations used across high-traffic, latency-sensitive workloads.

What you’ll do

  • Design platform APIs and shared primitives (not just components) with clear contracts, documentation, and upgrade paths that other teams adopt

  • Profile and instrument real user journeys, then ship the changes that move the numbers

  • Roll out cross-cutting changes safely with codemods, migration paths, and staged rollouts

  • Set technical direction in design and architecture reviews, and document the decisions and operational expectations behind them

  • Work directly with product teams to turn their friction into reusable platform improvements


Required skills and experience

  • Experience shipping and operating user-facing software in production

  • Designed frontend architecture other teams build on (frameworks, state, routing, SSR/CSR, migrations)

  • Built and operated an API/data layer (REST/GraphQL, error handling, caching)

  • Measured and improved client performance with instrumentation and monitoring

  • Made and explained architecture tradeoffs across UX, correctness, delivery speed, and maintainability

  • Comfortable in modern web stacks (TypeScript, React, Next.js, Node.js)

If you’re excited about this role but don’t meet every requirement, we still encourage you to apply.

This is a full-time role that can be held from our Foster City, CA office. The role has an in-office requirement of Monday, Wednesday, and Friday.

 

Full-Time Employee Benefits Include:

💰 Competitive Salary & Equity

💹 401(k) Program with a 4% match (US Only)

⚕️ Health, Dental, Vision and Life Insurance

🩼 Short Term and Long Term Disability

🚼 Paid Parental, Medical, Caregiver Leave

🏝 Flexible Time Off (FTO) + Holidays

🚗 Commuter Benefits (In-Office Only)

📱 Monthly Wellness Stipend

🧑‍💻 Autonomous Work Environment

🖥 In Office Set-Up Reimbursement (In-Office Only)

🚀 Quarterly Team Gatherings

☕ In Office Amenities (In-Office Only)

Want to learn more about what we are up to?

Interviewing + Culture at Replit

To achieve our mission of making programming more accessible around the world, we need our team to be representative of the world. We welcome your unique perspective and experiences in shaping this product. We encourage people from all kinds of backgrounds to apply, including and especially candidates from underrepresented and non-traditional backgrounds.

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