---
title: 'Principal Engineer at Fluxx'
canonical: 'https://feeny.ai/job/principal-engineer-fluxx-remote-4jv6dyt5t7xw'
type: 'job'
last_seen: '2026-09-10'
---

# Principal Engineer at Fluxx

- **Company:** Fluxx
- **Location:** Remote
- **Work type:** remote
- **Posted:** 2026-06-10
- **Last confirmed live:** 2026-09-10
- **Apply:** https://job-boards.greenhouse.io/fluxx/jobs/4688509006

## Job 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, and 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, and 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 rather than defaulting to a generic template
- 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 to drive complex decisions on product direction and process improvements
- 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, raise the architectural literacy of the group, and actively contribute to brainstorming and design discussions
- Champion thoughtful use of AI and agents in our SDLC, helping the team amplify their work

What you bring to the team:

- 8+ years of professional software engineering experience, with a meaningful share of that as a principal engineer or architect on a complex SaaS platform
- Deep experience as a full-stack engineer, with substantial backend depth using Ruby on Rails and the ability to engage credibly with frontend work in React
- A habit of considering alternatives, naming the trade-offs, and choosing the right path for the system in front of you rather than reaching for a textbook answer
- Confidence to put your opinion on the table, ask the questions others aren't asking, and engage in brainstorming and architectural debate
- Strong written and verbal communication, with experience working closely with product, design, QA, and infrastructure peers
- A deep foundation in computer science and a track record of making web applications highly performant
- Dedication to writing and maintaining documentation that helps others move faster
- Willingness to adapt to a fast-paced environment, to a codebase with a long history, and to a rapidly evolving AI-assisted development model
- A track record of mentorship and of raising the technical bar of the engineers around you

Technical Experience:

- Large Rails codebases
- Node.js and modern JavaScript/TypeScript - we expect our Node footprint to grow and value engineers who can speak credibly across both ecosystems
- AWS and DevOps fundamentals - you do not need to be an infrastructure specialist, but you should be comfortable reasoning about deployment, scaling, and observability
- MySQL at scale, including query optimization, indexing strategies, and schema migrations on live systems
- Elasticsearch, Redis, Resque, and other supporting services in a production Rails environment
- AI-assisted development workflows, including thoughtful use of agents, prompt design, and the operational realities of keeping agentic SDLC pipelines healthy
- B2B SaaS platforms, particularly those with highly configurable customer-specific behavior

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, and 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, and 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.

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 rather than defaulting to a generic template
- 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 to drive complex decisions on product direction and process improvements
- 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, raise the architectural literacy of the group, and actively contribute to brainstorming and design discussions
- Represent the engineering organization in leadership discussions and occasionally in direct conversations with customers.
- Champion thoughtful use of AI and agents in our SDLC, helping the team amplify their work

What you bring to the team:

- 8+ years of professional software engineering experience, with a meaningful share of that 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 in front of you rather than reaching for a textbook answer
- Confidence to put your opinion on the table, ask the questions others aren't asking, and engage in brainstorming and architectural debate
- Strong written and verbal communication, with experience working closely with product, design, QA, and infrastructure peers
- A deep foundation in computer science and a track record of making web applications highly performant
- Dedication to writing and maintaining documentation that helps others move faster
- Willingness to adapt to a fast-paced environment, to a codebase with a long history, and to a rapidly evolving AI-assisted development model
- A track record of mentorship and of raising the technical bar of the engineers around you
- Proven ability to navigate complex technical trade-offs, ensuring rapid feature delivery without compromising long-term platform scalability

Technical Experience:

[Node.js](http://node.js), React and modern JavaScript/TypeScript

- Large Ruby on Rails codebases - you should be able to speak credibly across both ecosystems
- AWS and DevOps fundamentals - you do not need to be an infrastructure specialist, but you should be comfortable reasoning about deployment, scaling, and observability
- MySQL at scale, including query optimization, indexing strategies, and schema migrations on live systems
- Elasticsearch, Redis, Resque, and other supporting services in a production Rails environment
- AI-assisted development workflows, including thoughtful use of agents, prompt design, and the operational realities of keeping agentic SDLC pipelines healthy
- B2B SaaS platforms, particularly those with highly configurable customer-specific behavior

Bonus points if you have some experience with Go, Python and other modern languages used in systems targeting high-performance and concurrency features, and Java

Salary:

Fluxx is committed to fair, transparent, and equitable compensation practices. We use a market based approach that considers cost of labor by geographic region, along with company size and industry benchmarks.

This role is categorized into two compensation zones based on location, with the following expected annual base salary:

- Zone 1 – San Francisco Bay Area & New York City  $164,000- $210,000
- Zone 2 – All other locations  $147,600- $199,800

The range listed reflects the expectations outlined in this job description. The final salary and commission package will be determined based on, but not limited to: (a) the candidate’s location, (b) individual skills and qualifications, and (c) relevant experience.

Benefits:

Fluxx offers the following benefits for the position subject to applicable eligibility requirements: 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. This position is also eligible for incentive stock options, subject to the terms of Fluxx’s applicable stock plans.

About Fluxx:

At Fluxx, our mission is to be the leading collaborative grant management platform in our global communities. We build technology that drives positive impact by helping foundations, government agencies, and nonprofits streamline the grantmaking process—making it easier to get funding to the organizations that need it most. For more than 15 years, we’ve helped organizations move away from manual processes and legacy tools to a flexible, AI + data-driven platform that supports the full lifecycle of grantmaking. Today, Fluxx supports a global community of 400+ customers who collectively manage and distribute more than $39B in grants annually.

We are a people-first and inclusive workplace committed to continuous learning. We pride ourselves on having a diverse workforce and we do not discriminate against any employee or applicant because of race, creed, color, religion, gender, sexual orientation, gender identity/expression, national origin, disability, age, genetic information, veteran status, marital status, pregnancy or related condition, or any other basis protected by law. We respect the gender, gender identity and gender expression of our applicants and employees. It is our policy to comply with all applicable national, state and local laws pertaining to nondiscrimination and equal opportunity.

## About Fluxx

## Company Overview
- **One-liner**: Fluxx provides a cloud-based grants management software platform that enables foundations, governments, and corporations to manage their entire grantmaking lifecycle with data-driven intelligence.
- **Entity Type**: Private (acquired by Metamorph Partners in 2021)
- **Headquarters**: San Francisco, California, United States
- **Founded**: 2010
- **Founders**: Not publicly available

## Core Business
- Primary industry/industries: Grants management software, philanthropy technology, SaaS
- Target customers: Foundations, government agencies, corporations, and other grantmaking organizations (B2B, Enterprise)
- Mission or purpose statement: "To drive innovation in technology to further our mission to amplify impact in our global communities, through our grants management solution." [fluxx.io](https://www.fluxx.io/about-us)

## Products & Services
- **Fluxx Platform**: A cloud-first, end-to-end grants management solution covering the entire lifecycle from funding announcements through pre-award applications, post-award payments, and measurement/evaluation.
- **Grantelligence™**: A business intelligence and analytics platform purpose-built for grantmaking, featuring 7,000+ dynamic visualizations, drag-and-drop functionality, and data-driven insights. [fluxx.io](https://www.fluxx.io/)
- **Fluxx Data Core™**: A centralized data layer that captures, structures, and connects all relevant grantmaking data to provide a comprehensive view of the process. [fluxx.io](https://www.fluxx.io/about-us)
- **Grantee Portals**: Branded, personalized portals for grantees to interact and coordinate on new and existing grants, improving communication and reducing redundant tasks.
- **Role-Based Dashboards**: Intuitive dashboards providing visibility and accountability for different roles within the grantmaking process.
- **Integrated Systems**: Connects with third-party systems to reduce manual data entry and streamline workflows.

## Market Standing
- **Valuation/Market Cap**: Not disclosed (privately held)
- **Key Metric**: Annual Revenue of $24.5M (LinkedIn estimate)
- **Total Funding**: $51.4M across 3 rounds (Series A: $6.2M led by Felicis in 2015; Series B: $16M led by Canvas Prime in 2017; Venture Round: $29.2M in 2021) [LinkedIn](https://www.linkedin.com/company/fluxx)
- **Notable Investors/Partners**: Metamorph Partners (current owner, acquired in 2021), ABS Capital, Felicis, Canvas Prime. [fluxx.io](https://www.fluxx.io/about-us)
- **Growth Signals**: 
  - 450+ customers globally
  - $23B+ in grants managed annually through the platform
  - Ranked #1 grants management software for two consecutive years
  - Acquired Grantseeker (another grants management platform)
  - Active hiring across engineering, product, and customer experience roles (7 open positions as of July 2026)
  - Job posting trends: +75% monthly, +40% quarterly growth [LinkedIn](https://www.linkedin.com/company/fluxx)

## Competitive Advantages
- **Purpose-built for grantmaking**: Unlike generic CRM or project management tools, Fluxx is specifically designed for the unique workflows and compliance needs of grantmaking organizations.
- **Grantelligence™ platform**: The only BI and analytics tool specifically designed for grantmaking, providing a unique data-driven advantage.
- **Data Core™**: A proprietary data layer that provides unmatched visibility into the entire grants lifecycle.
- **Cloud-first architecture**: Modern, scalable infrastructure compared to legacy on-premise solutions.
- **Customer trust**: Over 450 customers and $23B in grants managed annually demonstrate strong market adoption.
- **Women-led and values-driven**: The company emphasizes DEI, is a Pledge 1% member, and has a mission-focused culture.

## Strategic Focus
- **Product innovation**: Continued development of the Grantelligence platform and data-driven features to differentiate from competitors.
- **Integration ecosystem**: Expanding connections with third-party systems to create a seamless workflow for customers.
- **Market expansion**: Targeting government agencies alongside traditional foundation customers.
- **Platform unification**: The "OneFluxx" initiative (evidenced by a Senior Product Manager role for this project) suggests efforts to unify the platform post-acquisition of Grantseeker.
- **Data-driven equity**: Integration with Demographics via Candid to foster equity in grantmaking (announced Nov 2023). [LinkedIn](https://www.linkedin.com/company/fluxx)

## Why Work Here
- **Mission-driven work**: Employees are directly contributing to amplifying the impact of philanthropic organizations worldwide. The company states "every team member is driven to drive our mission forward." [fluxx.io](https://www.fluxx.io/about-us)
- **Culture**: Women-led, DEI champion, Pledge 1% member organization. Named to OpenComp's "Top 12 Transparent Employers to Watch" in 2023. [fluxx.io](https://www.fluxx.io/about-us)
- **Remote/Hybrid Policy**: Multiple roles are listed as fully remote (Director of Engineering, Principal Engineer), while others are location-specific (Senior Fullstack Engineer in New York). [Greenhouse](http://job-boards.greenhouse.io/fluxx)
- **Workforce**: 73 employees with a technical-heavy split (14% in engineering/technical roles). Presence in the US, Ireland, Spain, and Canada. [LinkedIn](https://www.linkedin.com/company/fluxx)
- **Employee Ratings**: 3.5/5.0 on LinkedIn (44 reviews) with Culture rated highest at 3.9. Compensation rated 3.5, Work-Life Balance rated 3.2, and Career Opportunity rated 3.5. [LinkedIn](https://www.linkedin.com/company/fluxx)
- **Salary Transparency**: Some roles have publicly listed salaries (e.g., Full Stack Java Developer at $134,432/year, Senior QA Engineer at $130,379/year, Technical Support Specialist at $62,442/year). [LinkedIn](https://www.linkedin.com/company/fluxx)
- **Engineering Culture**: Active hiring for Principal Engineer, Director of Engineering, and Senior Fullstack Engineers, suggesting investment in technical leadership and growth.

## Sources
1. [fluxx.io - About Us](https://www.fluxx.io/about-us)
2. [fluxx.io - Homepage](https://www.fluxx.io/)
3. [LinkedIn - Fluxx](https://www.linkedin.com/company/fluxx)
4. [Greenhouse - Fluxx Jobs](http://job-boards.greenhouse.io/fluxx)
5. [fluxx.io - Team Page](https://www.fluxx.io/about-us/team)

## Other roles at Fluxx

- [Senior Director, Professional Services](https://feeny.ai/job/senior-director-professional-services-fluxx-remote-nfyhprv61dyt)
- [Senior Product Manager, Grantseeker](https://feeny.ai/job/senior-product-manager-grantseeker-fluxx-new-york-08ebfh642y3n) — New York, NY
- [Director, Product Marketing](https://feeny.ai/job/director-product-marketing-fluxx-united-states-js68rzn5fgq0) — United States
- [Principal Engineer](https://feeny.ai/job/principal-engineer-raft-company-website-fort-hood-p1dh490tqyf9) — Fort Hood, TX
- [Principal Engineer](https://feeny.ai/job/principal-engineer-vitalize-san-francisco-jv4wadgac7d3) — San Francisco, CA
- [Principal Engineer](https://feeny.ai/job/principal-engineer-raft-company-website-tacoma-v4rnqr4vf505) — Tacoma, WA / Tampa, FL
- [Principal Engineer](https://feeny.ai/job/principal-engineer-weave-united-states-759qvysnv8w9) — United States
- [Principal Engineer](https://feeny.ai/job/principal-engineer-moo-london-p3tyvde544cb) — London, United Kingdom
- [Principal Engineer](https://feeny.ai/job/principal-engineer-digicert-herndon-s15dyztvfp9c) — Herndon, VA
- [Principal Engineer](https://feeny.ai/job/principal-engineer-bazaarvoice-belfast-8xy49bvr4r2p) — Belfast, United Kingdom