Founding Solutions Architect

Flex

Founding Solutions Architect at Flex working on enterprise deals and technical integration. Collaborating closely with sales and engineering to shape company direction in the health and wellness payment space.

Posted 4/29/2026full-timeRemote • 🇺🇸 United StatesSeniorLead💰 $160,000 - $260,000 per yearWebsite

About the role

Key responsibilities & impact

The technical narrative for every enterprise deal, from first discovery call through security review, integration design, and go-live
Custom integration architectures for complex merchant-built checkouts. The bulk of this work is direct API integration with sophisticated, custom commerce stacks
Live POCs, sandbox demos, and integration walkthroughs that move six- and seven-figure deals across the line
The structured feedback loop into product and engineering, synthesizing what enterprise prospects need, where we're losing on capability, and where the next durable bet is
Reusable enablement assets, including reference architectures, integration playbooks, security and compliance one-pagers, and ROI models that scale the GTM team
Smooth handoff to customer success and engineering for post-sale implementation

Requirements

What you’ll need

7+ years in Solutions Architecture, Sales Engineering, or Solutions Engineering, with at least 3 years selling into enterprise
You've owned the technical side of complex, multi-stakeholder deals. The kind that involve a CTO, a CISO, a head of e-commerce, and a procurement team all in the same Slack channel
You can read API docs, sketch an integration on a whiteboard, and ship a working POC when a deal calls for it. You don't need an engineer in the room to be technically credible
Background in payments, fintech, e-commerce, or healthtech is strongly preferred HSA/FSA, benefits, or regulated payments is a major plus
You've built feedback channels into product orgs that engineers actually trust, not just forwarded customer emails
You write well. Crisp follow-ups, clean architecture diagrams, briefs an exec can read in 90 seconds
Comfortable in early-stage chaos. You've been at a seed or Series A/B company before and you know what "first one in the seat" actually feels like

Benefits

Comp & perks

Meaningful founding-team equity
Medical, dental, and vision plans
Unlimited PTO and sick days
Paid parental leave
Remote-first, with quarterly in-person meetups. Expect ~25% travel for prospect on-sites, partner conversations, and industry events

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

API integrationintegration designtechnical architectureproof of concept (POC)integration playbookssecurity complianceROI modelingenterprise solutions architecturesales engineeringmulti-stakeholder deal management

Soft Skills

communicationsynthesistechnical credibilitywritingcollaborationadaptabilityproblem-solvingcustomer engagementfeedback managementorganizational skills