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.

Fluxx is looking for a strategic, systems-thinking Senior Product Manager, OneFluxx to own and evolve the internal operating system that powers how we work.

As the Senior Product Manager for OneFluxx, you’ll own the vision, strategy, and execution of the platform that unifies data across every enterprise tool we use and turns it into actionable insight. You’ll treat internal stakeholders and employee-submitted proposals like customers — understanding their needs, prioritizing with clear business cases, and shipping pragmatic solutions that increase company velocity, output per employee, and quality of execution. You’ll partner directly with VPs and C-level leaders to align on the roadmap for the highest-ROI investments, and lead build-vs.-buy decisions, and own data security, privacy, and access controls. You’ll also create the playbooks — including how PMs across Fluxx leverage AI in product design and discovery — that scale how every team operates as we grow. This is a high-ownership, executive-facing role that blends product management, operations strategy, and data leadership.

We are looking for people who are curious, tenacious, candid, 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. Candidates must be located in the United States.

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.

Founded by grantmakers, Fluxx was built on the belief that the systems supporting philanthropy should be as thoughtful and strategic as the missions they serve. 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 500+ customers who collectively manage and distribute more than $39B in grants annually.

How you will make an impact/What you will do:

• Partner across the Executive Leadership Team (ELT) to develop, refine, and communicate the vision for OneFluxx across the company and our customer community.
• Own product strategy, roadmap, and execution for OneFluxx, maintaining a holistic view of how systems, teams, and data connect across the company.
• Serve as the internal “data head” — mapping, connecting, and rationalizing data sources across departments so leadership and teams can make faster, evidence-based decisions.
• Run a transparent intake and prioritization process for employee-submitted proposals, evaluating every initiative through a clear business case and build-vs.-buy lens (cost, speed-to-value, security, compliance).
• Partner with InfoSec and Legal to design and enforce data-access, privacy, and governance controls that meet enterprise-grade standards.
• Lead rollout and change management for new systems and workflows — driving high adoption through clear communication, documentation, and stakeholder enablement.
• Continuously monitor, improve, and maintain features over time to ensure continued success of the platform and internal “customer” use cases.

What you bring to the team/ About you:

• 8+ years in product management, operations, or a related data/systems role within a technology or SaaS environment, with a track record of owning and shipping end-to-end products that drive adoption — not just delivery.
• Demonstrated experience consolidating disparate enterprise tools and data sources into unified platforms, dashboards, or internal operating systems used across multiple functions.
• Strong business-case and prioritization skills — you can quantify impact, evaluate competing requests, and communicate trade-offs to executives, while operating just as comfortably at the tactical level (writing acceptance criteria, defining success metrics).
• Working knowledge of data architecture, APIs, integrations, and modern analytics/BI tooling, plus a deep understanding of the security, privacy, and access-control principles that come with enterprise data environments.
• Highly relational systems thinker who builds trust across levels of the org, surfaces what’s real (not just what’s visible), and designs scalable solutions to ambiguous, cross-functional problems.
• High-ownership operator and change agent — self-directed, holds the prioritization line, and equally focused on shifting how teams work as on shipping. Bonus: experience in grantmaking, philanthropy-tech, or other mission-driven SaaS.

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 zones based on location.
Fluxx is currently seeking candidates located in all U.S.-based geographies for this role.

• Zone 1 – San Francisco Bay Area, New York City
  $195,000 - $200,000
  
  
• Zone 2 – Atlanta, Seattle, San Diego, Washington D.C.
  $173,000 - $183,000
  
  
• Zone 3 – All other U.S. locations
    $163,000 - $173,000

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.