Senior Developer

Foundant + smartsimple; United States; Remote; USD 140,000 - 200,000; Full time

Benefits offered by this job

Tuition reimbursement

Mindfulness initiatives

Flexible PTO

Internal mobility

Job summary

Foundant + smartsimple is seeking a senior engineer to design and ship interactive prototypes, run rapid experiments, and navigate the full stack from frontend to APIs. You’ll contribute ideas, share work early, and move on when the evidence says to.

Fluency with AI-assisted development (Copilot, Cursor, Claude) is a strong asset. You’ll work in a fast-paced environment that values user insight, speed, and hypothesis-driven decision making, while maintaining accountability and collaboration

Qualifications

• Broad technical range with senior engineering experience.
• Comfort designing around hypotheses rather than fixed specs.
• Bias toward speed and delivering usable results.
• Genuine curiosity about users and their behavior.
• Ability to detach from own work when evidence suggests alternatives.

Responsibilities

• Design and build working prototypes that real users can interact with.
• Run fast experiments and decide next steps based on data.
• Work across the full stack—frontend, backend, APIs—without being blocked by layers.
• Contribute ideas and shape what is built, not just how it is built.
• Share work early, learn openly, and move on when evidence says so.

Skills

Senior-level engineering

Hypothesis-driven

Speed-focused

User curiosity

Evidence-driven decision making

AI-assisted development

Tools

Copilot

Cursor

Claude

Job description

What You'll Do:

• Design and build working prototypes (not mockups) that real users can interact with
• Run fast experiments, put them in front of users quickly, and make clear decisions about what to do next
• Work across the full stack - frontend, backend, APIs - without being blocked by layer boundaries and specific technologies
• Contribute ideas, not just implementations. You’ll shape what we build, not just how we build it
• Share work early, learn out loud, and move on when the evidence says to

What You’ll Need:

• Senior-level engineering experience with broad technical range
• Comfortable working from a hypothesis rather than a detailed spec
• A bias toward speed - you know when good enough is good enough
• Genuine curiosity about users and why they behave the way they do
• The ability to stay unattached to your own work when the evidence points elsewhere
• Fluent with AI-assisted development. You’ve built real workflows around tools like Copilot, Cursor, or Claude and use them to move meaningfully faster, not just as an autocomplete

What this role is not:

This role isn’t the right fit if you do your best work with clearly defined requirements, prefer to specialize in a single layer, or want a team that optimizes for production-grade code above all else.

Why You’ll Love Working at Foundant:

• At the heart of everything we do is a commitment to innovation and making a positive impact. Whether you’re working on projects that empower not-for-profits, community foundations, or corporations, your contributions will help drive real-world change.
• We offer competitive salary and benefits, including tuition, and lifestyle reimbursements, and bespoke mindfulness and fitness initiatives.
• With our Flexible PTO policy, you’ll have the freedom to manage your time in a way that supports your personal well-being and professional success.
• We’re committed to your professional and personal development. With our merger, you’ll have the chance to collaborate across teams, giving you exposure to diverse ideas, expertise, and projects that span multiple industries.
• As part of a larger organization, you’ll have even more opportunities to grow your career. Whether it’s exploring new roles, leadership opportunities, or shifting to a different department, we support internal mobility to help you achieve your career goals
• You’ll enjoy autonomy and responsibility, empowering you to approach your work creatively and independently, fostering innovation and independent thought.
• Employee recognition is a core part of our culture. When you do a great job, we make sure everyone knows about it!

Foundant is an equal opportunity employer, committed to building a diverse workforce that represents the communities we serve. We welcome and encourage applications from all qualified candidates, and will consider all applicants without regard to race, color, citizenship, religion, sex, marital/family status, sexual orientation, gender identity, Indigenous status, age, disability, or individuals who may require accommodation.

Foundant is also committed to providing accommodations throughout the interview and employment process. Accommodations are available upon request for candidates participating in all aspects of the selection process. If you have accessibility requirements during the recruitment process and require accommodation, please contact [e-mail].