[Hiring] Principal Engineer @Fluxx

Role Description

Fluxx is looking for a highly motivated Principal Engineer to join the Engineering team. As a Principal Engineer at Fluxx, you'll be a senior technical leader on our engineering team, responsible for driving the architecture and implementation of large, cross-cutting initiatives on our grantmaking platform.

You will work closely with our SVP of Engineering, our co-founding CTO, Director of Engineering, fellow Principal Engineers, and our product and infrastructure teams to:

• Make the right architectural calls
• Write meaningful code
• Help the broader team raise its technical bar

This is a hands-on role. You'll spend the majority of your time in code, working through real problems and deliverables end-to-end, and the rest of your time on design, technical direction, and unblocking others.

We are looking for someone who:

• Considers alternatives carefully
• Weighs trade-offs against the realities of our system
• Is comfortable putting their opinions on the table and being challenged on them

This is a full-time exempt and remote position. Candidates must be located in the United States. We aren't accepting contractors.

How you will make an impact:

• Lead the architecture and implementation of major initiatives in our platform
• Make architectural decisions counterfactually, considering several plausible approaches, surfacing the trade-offs, and choosing the best path
• Provide technical leadership across all phases of large-scale engineering work, from scoping and design through implementation, code review, rollout, and maintenance
• Work cross-functionally with the Director of Engineering, fellow principal engineers, infrastructure engineers, product managers, DevOps, and QA
• Design and implement user-facing and backend features across the entire platform
• Produce high-quality code that is well designed, thoroughly tested, and passes peer review
• Lead and drive best practices with the team across the entire SDLC
• Mentor engineers across the team and raise the architectural literacy of the group
• Represent the engineering organization in leadership discussions and occasionally in direct conversations with customers
• Champion thoughtful use of AI and agents in our SDLC

Qualifications

• 8+ years of professional software engineering experience, with a meaningful share as a principal engineer or architect on a complex SaaS platform
• Deep experience as a full-stack engineer, with substantial depth using NodeJS and React
• A habit of considering alternatives, naming the trade-offs, and choosing the right path for the system
• Confidence to put your opinion on the table and engage in brainstorming and architectural debate
• Strong written and verbal communication skills
• A deep foundation in computer science and a track record of making web applications highly performant
• Dedication to writing and maintaining documentation
• Willingness to adapt to a fast-paced environment
• A track record of mentorship and raising the technical bar of the engineers around you
• Proven ability to navigate complex technical trade-offs

Requirements

• Technical Experience:
• Node.js, React, and modern JavaScript/TypeScript
• Large Ruby on Rails codebases
• AWS and DevOps fundamentals
• MySQL at scale, including query optimization, indexing strategies, and schema migrations
• Elasticsearch, Redis, Resque, and other supporting services in a production Rails environment
• AI-assisted development workflows
• B2B SaaS platforms with highly configurable customer-specific behavior
• Bonus points if you have some experience with:
• Go, Python, and other modern languages
• Java

Benefits

• Medical, dental, and vision insurance
• Flexible time off
• Paid sick leave
• 12 weeks of fully-paid parental leave
• Annual learning and development stipend
• Internet stipend
• One-time home office set-up stipend
• 401(k) retirement plan with company match
• Eligible for incentive stock options

Salary

Fluxx is committed to fair, transparent, and equitable compensation practices. This role is categorized into two compensation zones based on location:

• Zone 1 – San Francisco Bay Area & New York City: $164,000 - $225,000
• Zone 2 – All other locations: $147,600 - $214,100

The final salary and commission package will be determined based on location, individual skills and qualifications, and relevant experience.