Fluxx
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Senior Fullstack Engineer
Fluxx is looking for a highly motivated Senior Fullstack Engineer to join the Grantseeker Engineering team.
As a Senior Fullstack Engineer, you will play a key role in designing, building, and scaling the Grantseeker Pro platform, along with other customer-facing and internal products. You’ll work closely with product, design, and engineering leadership to deliver high-quality, performant software that directly impacts nonprofits and grantmakers worldwide. Reporting to the VP of Engineering (Ben Holzman), you will help shape technical direction, contribute to architectural decisions, and mentor other engineers on the team. This role requires strong ownership, a product mindset, and the ability to move quickly while maintaining high engineering standards.
We are looking for people who are curious, tenacious, intellectually honest, and have a bias toward action. We welcome diverse perspectives and encourage you to apply if you think you can bring value to our team—even if your experience doesn’t perfectly match the job description.
This is a full-time exempt position based out of New York City. Candidates must be located in New York and willing to work from the office at least 3 days a week.
About Fluxx:
At Fluxx our mission is to be the leading collaborative grantmaking platform in our global communities.
We believe in building technology that drives positive impact in our world. Our platform helps foundations and agencies streamline the grantmaking process, making it easier to get funding to those that need it to support their mission. We are driven to help facilitate change through our solutions that automate grantmaking for organizations all over the world. Over the past decade, Fluxx has built a diverse and engaged community of 350+ grantmakers who work with over 150,000 foundations, government agencies and nonprofits worldwide. Through Fluxx, they have issued over $15B in grants in the past year alone.
How you will make an impact/What you will do:
- Design, build, and maintain fullstack features across the Grantseeker Pro platform and related products
- Collaborate cross-functionally with product managers, designers, and engineers to deliver high-impact user experiences
- Contribute to system architecture and technical decision-making, ensuring scalability, performance, and reliability
- Write clean, maintainable, and well-tested code across frontend and backend systems
- Lead and participate in code reviews, providing thoughtful feedback and mentoring other engineers
- Improve development processes, tooling, and engineering standards to increase team velocity and product quality
What you bring to the team/ About you:
- 10+ years of professional software engineering experience, with strong fullstack development expertise
- Proficiency in React/TypeScript/JavaScript, with experience building modern web applications (frontend and backend)
- Experience working with PostgreSQL and designing efficient data models
- Familiarity with cloud infrastructure, preferably Google Cloud Platform (GCP)
- Experience with or interest in Claude Code (Anthropic) or AI-assisted development tools
- Strong problem-solving skills, ownership mindset, and ability to work effectively in a remote, collaborative environment
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 three compensation tiers based on location, with the following expected annual on-target earnings (base salary + commission):
- Zone 1 – San Francisco Bay Area, New York City
$171,000- $231,000 - Zone 2 – All other U.S. locations
$153,000 - $207,900
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.
More About Fluxx:
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.
Ready to apply?
Apply to Fluxx
Who we are
At Fluxx, our mission is to be the leading collaborative grantmaking platform that amplifies impact in our global communities. We’re a mission-driven business making an impact in philanthropy, and our cloud platform enables the end-to-end grantmaking process for funders and doers. We volunteer, serve our community, and we’re committed to building a team of outstanding individuals with diverse backgrounds and perspectives. We are looking for the best talent to continue to drive our mission forward.
Who We’re Looking For:
Fluxx is seeking a Director of Engineering to lead the development and maintenance of our Grantmaker platform and oversee the engineering team behind it. You’re a technical leader who thrives in a fast-paced, high-growth environment and has a proven track record of both engineering excellence and people leadership. You will build a high-performing team shipping on a predictable, sustainable cadence, spearhead AI-assisted development adoption to measurable productivity gains, and establish yourself as the trusted technical owner of the Grantmaker platform’s roadmap execution.
In this role, you’ll ensure your team is motivated, productive, and growing professionally, while consistently delivering high-quality, scalable features. You’ll drive architectural consistency, cross-team collaboration, and operational excellence. You will be accountable for your teams’ architecture, delivery and processes. This position reports directly to the SVP of Engineering.
What You’ll Be Doing
- Lead and deliver: Lead one or more engineering teams to ship high-quality features and maintain the Grantmaker platform. Own delivery timelines, stakeholder communication, and release quality.
- Build and inspire: Recruit, develop, and retain a high-performing distributed engineering team. Set clear expectations, run effective 1:1s, and create an environment where engineers feel motivated to contribute to a high-performing team.
- AI-assisted development strategy: Own your team’s AI tooling adoption—set measurable targets for GitHub Copilot, Claude Code, and Claude.ai usage, track productivity impact, and ensure every engineer leverages AI as a force multiplier.
- Foster excellence: Establish a strong engineering culture grounded in high-quality execution, continuous learning, and rapid innovation.
- Collaborate cross-functionally: Partner with Product, DevOps, Infrastructure, QA, and Customer Experience to align engineering execution with company strategy and customer needs. Resolve organizational challenges and foster collaboration across teams with empathy and clarity.
- Manage large-scale initiatives: Define milestones, assess project risk, and lead cross-functional teams through complex, multi-sprint initiatives.
- Shape architecture & strategy: Drive engineering-wide initiatives focused on innovation, customer impact, and long-term scalability, and drive architectural integrity in partnership with the team architects.
- Be a voice for Engineering: Represent the engineering organization in leadership discussions and occasionally in direct conversations with customers.
- Contribute technically: Participate in code, system, and architecture reviews; guide teams in maintaining high standards of technical excellence.
- Define success: Define and own engineering OKRs for your teams. Track platform performance, delivery health, and team effectiveness.
What you bring to the team
- A degree in computer science/engineering is required
- 8+ years of experience in the software industry, of which at least 5 years should have been as an individual contributor doing full-stack development
- 3+ years building and managing distributed engineering teams (onshore and offshore)
- 3+ years of deep experience with Ruby on Rails application architecture and best practices
- Experience managing teams working on complex enterprise SaaS products
- Proven experience driving AI-first development and leveraging AI tools yourself and within the team
- Strong knowledge of the following technologies: the AWS stack, Elasticsearch, Unix-based systems, Redis, and NodeJS/Python
- Proficiency with SQL databases, including data modeling, query optimization, and transaction management
- Expertise in working with cloud systems, specifically for application hosting, file storage, and other related concerns.
- Experience measuring and improving engineering metrics like DORA and SPACE
- Experience with process improvement methodologies (ex: Lean Six Sigma) and automation
- Nice-to have: experience with Java/Scala, Play Framework and non-RDBMS databases
- Passionate about Fluxx’s vision to become THE company that changes Philanthropy forever
Salary
Fluxx is committed to fair, transparent, and equitable compensation practices. We use a market-based approach to pay that reflects the cost of labor in different geographic regions, as well as our company size and industry standards.
This role is categorized into three compensation tiers based on location, with the following expected annual on-target earnings (base salary + commission):
Fluxx is currently seeking candidates located in Zone 2 and Zone 3 geographies for this role.
- Zone 1 – San Francisco Bay Area, New York City
We are not currently hiring for Zone 1 locations. - Zone 2 – Boston, Los Angeles, San Diego, Seattle, Washington D.C.
$200,000 - $215,000k - Zone 3 – All other U.S. locations
$195,000 - $200,000k
The successful candidate’s starting salary will be determined based on, but not limited to (a) location; (b) individual candidate skills and qualifications; and (c) individual candidate experience.
Fluxx is committed to fair and equitable compensation practices. We take a market-based approach to pay which may vary depending on your location. Locations are categorized into one of three zones based on a cost of labor index for that geographic location and our compensation philosophy.
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.
More About Fluxx
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.
Ready to apply?
Apply to Fluxx