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Founding Engineer

2 weeks ago

Tallinn, Harjumaa, Estonia Startup Wise Guys Full time

Capstacker helps early-stage startups 
pay great operators flexibly
* — with 
equity, part-equity, and milestone-based cash
.

Phase 1 - Proof of Concept (Now):
a web platform validating the model

Phase 2 - Fintech Infrastructure (Next 12-24 mo):
a fintech infrastructure layer enabling others to use our compensation logic via API.

Think:

  • Stripe → for flexible pay mechanics
  • Carta → for equity infra
  • Deel → for startup operators

Capstacker sits where those worlds meet.

*
operators are non-FTE service providers of all sizes - including fractional CFOs, software and marketing agencies, legal firm, B2B creators and more.

Why Now

  • Startups increasingly hire fractional or project-based operators, but compensation is messy:
  • No unified way to structure equity + cash + milestone deals
  • Manual tracking of vesting, KPIs, and payments across tools
  • Little transparency or trust between founders and operators
  • Operators want
    ownership
    , not employment.
  • Fintech rails & APIs
     now make it possible to structure milestone-based compensation transparently and securely.
  • Capstacker is early but already proving traction with 
    PoC deals and operator interest
    .

What Exists Today

  • Prototype live for startups to structure 
    hybrid equity + milestone-based deals
  • First PoC deals are being negotiated
  • Early operator community
     engaging around flexible startup pay
  • A market launch
    team

What's Missing: and Where You Come In

We need a 
technical cofounder / founding engineer
 to:

  • Build the 
    first usable product layer
     (frontend + contract + payment infra)
  • Help architect the 
    API-first fintech platform
     powering flexible startup pay
  • Work hands-on with early PoC users — startups + operators
  • Shape tech culture and product roadmap from Day 0

Stack (open for debate):

  • Frontend: + Tailwind
  • Backend: Node / Nest / Django
  • Infra: Supabase / Postgres / Plaid / Stripe APIs
  • Smart contracts / tokenization (later phase)

Ideal Profile

  • 0→1 builder who thrives in ambiguity
  • Product-oriented: understands founders, not just code
  • Interested in 
    ownership economics
    , 
    equity infrastructure
    , 
    API fintech
  • Previous exposure to 
    B2B SaaS
    , 
    fintech
    , or 
    developer tools
     a plus
  • Values 
    autonomy, velocity, and thoughtful design
     over process

What's on the Table

  • Cofounder-level equity
     (customizable to contribution & stage)
  • Salary introduced post-funding
  • Flexible setup
     — remote, async, milestone-based contributions initially
  • Build with early customers + advisors before external capital
  • Front-row seat to shaping the 
    future of startup compensation

Vision

In a few years, Capstacker will power 
how founders and operators collaborate globally
 — where every contribution can be tracked, valued, and compensated flexibly.

We start with servicing individual deals; we evolve to building the fintech layer for 
ownership-based work
.