Remote Founding Engineer Jobs in Seattle, WA (NOW HIRING)

About Summation
Summation is building the future of business planning and analytics by bridging the gap between data and decision-making. We empower organizations to transform complex data into clear, actionable insights that drive business outcomes. Our AI-native platform pairs advanced data models with intuitive workflows to make enterprise performance management simple, collaborative, and effective.
The Role
As a Staff Product Engineer at Summation, you'll be the senior front-end leader on our team, reporting directly to our CTO and owning the front-end architecture and experience of our product end to end. This is a hands-on, deeply technical role where you'll spend your time building, not just advising, and is a role for someone with a sharp product sense who has designed and shipped polished, ambitious products from the ground up.
You'll set the technical direction and quality bar for our front end and establish the patterns the rest of the team builds against. Our product is analytics-rich and highly interactive, which makes the front end one of the hardest and most important parts of what we do: dense, data-heavy interfaces that still need to feel fast, clear, and effortless. You'll partner closely with the CTO, our Founding Designer, and product team to turn ambitious ideas into interfaces that perform.
As a Series A company approaching product-market fit with our first customers, we're at the point where the front-end foundations you lay will define how well we scale. You'll have influence over both architecture and product direction, the autonomy to make consequential decisions, and direct access to the people setting company strategy. If you're energized by ownership, thrive in the ambiguity of an early-stage startup, and want your work to shape the product and the team around it, this is the role for you.
Key Responsibilities

• Own the front-end architecture and user experience of our product end-to-end from concept through shipping and iteration
• Set the bar for front-end quality, patterns, and performance, and help establish the standards the team builds against
• Partner directly with the CTO, Founding Designer, and product team to shape direction and translate ambitious ideas into polished, performant interfaces
• Build responsive, scalable, data-dense interfaces for analytics and AI-driven workflows
• Bring a strong product perspective to engineering decisions, advocating for the user at every step

Qualifications

• 8+ years of software engineering experience, including 4+ years of dedicated, hands-on front-end product development - building products, not solely platform or library work.
• Experience building and shipping a product from zero to one with end-to-end ownership, as a founding or early engineer at a startup or with equivalent ownership inside a larger company
• A track record of shipping to internal or external users and iterating based on their feedback
• Strong communication and problem-solving skills, ability to work with cross-functional teams
• Proficiency in Python, TypeScript, JavaScript, or similar languages

What Success Looks Like in Your First 6 Months

• First 30 days: You've ramped on the codebase, product, and customers, shipped your first meaningful improvements, and formed a clear point of view on the state of the front end and where it needs to go.
• 60 days: You've identified the highest-leverage gaps in the existing front-end architecture and started addressing them, sharpening the patterns the team builds against while shipping polished, customer-facing features alongside the CTO and Founding Designer.
• 90 days: The quality and performance bar you've raised is visible in the product, interfaces feel faster and more cohesive, and your refined patterns are becoming how the team builds by default.
• 6 months: You're the clear owner of the front end. You've meaningfully leveled up the architecture you inherited, shipped ambitious data-dense features customers rely on, and influenced product direction beyond just the front end.

Nice to Have

• Hands-on experience building interfaces backed by LLMs or agent frameworks
• Background in analytics, data visualization, or AI-driven products
• Familiarity with financial software, models, or data
• Experience leading or mentoring engineers (not required for this role)

Location & Work Modality
This is a hybrid role with a team based in Bellevue, Washington; however, we're open to remote arrangements for candidates on a case-by-case basis
AI Policy in Interviews
We use AI pragmatically in our work, and we welcome you to do the same during interviews. You're free to use AI tools for syntax, semantics, or general API questions. We ask that you not use AI to solve interview problems or generate substantive code or logic; we're interested in how you think, communicate, and incorporate feedback.
What We Offer

• Competitive salary and equity options
• Flexible (unlimited) paid time off
• Medical, dental, and vision benefits for you and your family
• 401(k) plan
• Parental leave
• A collaborative environment where your voice matters
• Opportunities for growth and career development
• The chance to work on cutting-edge technology that is transforming how businesses plan and execute