Principal Full-Stack Software Engineer

About Saleo

Saleo exists to help software companies create incredible software demos that win and retain more customers. Our platform powers interactive, production-like demo experiences used by sales and customer teams every day.

As a Principal Full-Stack Software Engineer , you will be a senior technical leader on our Product Development team , reporting to the VP of Engineering . You will help define Saleo’s technical direction, lead system architecture, and deliver scalable, reliable, high-quality software while mentoring engineers across the organization.

Responsibilities

Technical Leadership & Architecture

• Own and evolve system architecture across frontend, backend, and cloud infrastructure.
  
  
• Lead the design and implementation of large-scale, high-performance, distributed systems.
  
  
• Set and uphold engineering standards, best practices, and architectural patterns.
  
  
• Lead and participate in architecture and design reviews.
  
  
• Evaluate and introduce new technologies and frameworks where appropriate.
  
  

Hands-On Engineering

• Design, write, and review production-quality code in React, JavaScript, TypeScript, Node.js , and other languages/frameworks as needed.
  
  
• Build and maintain services spanning browser extensions, web portals, and partner integrations .
  
  
• Design and operate backend services using AWS, Lambda, DynamoDB , and related cloud services.
  
  
• Deploy high-volume, customer-facing services to production multiple times per day.
  
  
• Instrument systems to provide visibility into performance, reliability, and business impact.
  
  

Reliability, Operations & Quality

• Own production health by monitoring availability, latency, and overall system performance.
  
  
• Lead incident response, root-cause analysis, and long-term reliability improvements.
  
  
• Partner with Support and Product teams to triage and resolve complex customer and platform issues.
  
  
• Champion engineering quality through automated testing, code reviews, and CI/CD improvements.
  
  

Mentorship & Cross-Team Influence

• Mentor senior and mid-level engineers, raising the overall technical bar.
  
  
• Influence engineering culture through documentation, knowledge sharing, and technical leadership.
  
  
• Collaborate cross-functionally with Product, Design, Support, and Leadership to align technical execution with business goals.
  
  

Required Skills & Experience

Experience

• 10+ years of professional software engineering experience , including substantial hands-on experience across frontend, backend, and production systems .
  
  
• Proven ability to design, build, deploy, and operate large-scale, distributed systems in production.
  
  
• Significant experience with modern frontend technologies, including:
  
  
  • React
    
    
  • JavaScript
    
    
  • TypeScript
    
    
• Significant experience with backend and cloud technologies, including:
  
  
  • Node.js
    
    
  • AWS (including Lambda and serverless architectures)
    
    
  • DynamoDB or other NoSQL databases
    
    
• Extensive experience running and owning production systems on a major cloud provider (AWS preferred).
  
  
• Strong experience with RESTful and/or RPC API design .
  
  
• Experience designing and evolving document-oriented and NoSQL data models.
  
  

Technical Strengths

• Deep understanding of scalability, performance tuning, and fault tolerance.
  
  
• Strong familiarity with observability tools (metrics, logging, tracing).
  
  
• Experience building highly available systems with frequent, safe deployments.
  
  

Preferred Skills

• Experience developing browser extensions .
  
  
• Experience influencing or leading technical strategy across teams.