Senior Full-Stack Engineer: React & Go – Field UI

Toptal; Berkeley (CA); On-site; USD 140,000 - 210,000; Full time

Job summary

Toptal is seeking a senior full-stack engineer to build user-facing applications that give field engineers visibility and control over large-scale industrial power systems. This hands-on role spans frontend and backend development and interfaces directly with hardware in the field, requiring close collaboration with cross-functional teams.

On-site presence is preferred, with min 3 days/week in Berkeley, CA, and the engineer will own end-to-end UI features, system integration, and deployment in

Qualifications

• 6+ years of professional software engineering experience in production systems.
• Strong React or SPA-based frontend experience.
• Experience with Python or Go and modern backend APIs.
• Familiarity with industrial communication protocols (e.g., Modbus, DNP3, CAN).
• Ability to work across frontend and backend layers with ownership mindset.

Responsibilities

• Develop end-to-end UI features and backend APIs for field-facing software.
• Collaborate with field, firmware, mechanical, and other software engineers.
• Drive features from requirements to rollout and user feedback.
• Extend into core infrastructure and embedded control services as needed.
• Ensure safe commissioning and operation of energy infrastructure tools.

Skills

React / SPA frameworks

Python

Go

gRPC / Protobuf

Full-stack development

Job description

Toptal is seeking a senior full-stack engineer to build user-facing applications that give field engineers visibility and control over large-scale industrial power systems. This hands-on role spans frontend and backend development and interfaces directly with hardware in the field, requiring close collaboration with cross-functional teams.

On-site presence is preferred, with min 3 days/week in Berkeley, CA, and the engineer will own end-to-end UI features, system integration, and deployment in