Senior Fullstack Engineer- GrantSeeker

Fluxx

11d • $153,000 - $231,000 • Remote

About The Position

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 your team—even if your experience doesn’t perfectly match the job description.
This is a full-time exempt and remote position. Candidates must be located in the United States or the European Union.

Requirements

• 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)
• Strong problem-solving skills, ownership mindset, and ability to work effectively in a remote, collaborative environment

Nice To Haves

• Experience with or interest in Claude Code (Anthropic) or AI-assisted development tools

Responsibilities

• 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

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
• This position is also eligible for incentive stock options, subject to the terms of Fluxx’s applicable stock plans.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed
• Number of Employees: 11-50 employees