Senior Frontend Engineer — Real-Time React & GraphQL

Cssmerge; Mountain View (CA); On-site; USD 167,000 - 230,000; Full time

Benefits offered by this job

Medical, dental, and vision insurance

401(k)

Health Savings Account (HSA)

Flexible Spending Accounts

Time Off policies

8 paid holidays per year

Paid sick time

Paid Parental Leave

Life and disability insurance

Job summary

Cssmerge in Mountain View, CA, is seeking a frontend engineer to design and build high-performance React applications powered by WebSockets, SSE, and GraphQL subscriptions. You will lead technical design, own projects end-to-end, and mentor engineers while improving frontend reliability in a fast-paced, real-time environment.

Requirements include 3+ years of frontend software engineering, strong TypeScript and React experience, and a track record of leading initiatives and collaborating across

Qualifications

• 3+ years of software engineering with frontend focus.
• Strong TypeScript and modern web app development.
• Strong React experience.
• Understanding of client networking, async programming, performance optimization, caching, and state management.
• Experience integrating GraphQL and REST APIs.
• Proven ability to lead initiatives and influence architecture/best practices.
• Experience mentoring junior engineers and supporting team growth.
• Willingness to adapt as the product and team evolve.

Responsibilities

• Design and build high-performance React apps using WebSockets, SSE, and GraphQL subscriptions.
• Lead technical design for complex features from architecture to production rollout.
• Own projects end-to-end, driving execution and technical decisions.
• Improve frontend reliability, latency, and scalability in a real-time, high-throughput environment.
• Lead debugging, incident response, and performance investigations for frontend systems.
• Mentor and coach engineers to raise frontend engineering bar.

Skills

Frontend engineering

TypeScript

React

WebSockets

SSE

GraphQL subscriptions

Mentoring

Leadership

Job description

Cssmerge in Mountain View, CA, is seeking a frontend engineer to design and build high-performance React applications powered by WebSockets, SSE, and GraphQL subscriptions. You will lead technical design, own projects end-to-end, and mentor engineers while improving frontend reliability in a fast-paced, real-time environment.

Requirements include 3+ years of frontend software engineering, strong TypeScript and React experience, and a track record of leading initiatives and collaborating across