Technical co-builder retainer — 20h/week — monthly

About this Gig

A senior engineering partner. Not a contractor, not a feature factory. 20 hours per week of focused engineering work for early-stage SaaS founders who need a real technical co-builder beside them — not someone they have to\ manage. Async-first. Weekly demo. Month-to-month. For founders who\ • Shipped an MVP and need ongoing engineering velocity without hiring full-time yet\ • Want a single engineer who holds the whole product in head\ • Need someone who'll push back on bad ideas, not just execute tickets\ • Prefer written status over daily standups\ • Value shipped features over hours logged What you get each month\ • 20 hours/week of focused engineering (~80 hours/month)\ — mix of feature work, bug fixes, technical decisions, and code review\ • Weekly Loom demo + weekly written status update\ • Slack or Linear for async coordination (no daily standups)\ • Architecture decisions documented as we make them (lightweight ADR format)\ • On-call for production incidents during CET business hours (09:00–18:00 CET)\ • Monthly technical roadmap review (60-min call)\ • Direct access to me — not a project manager, not an account exec How it works\ • Month-to-month commitment. Cancel anytime with 2 weeks notice\ • Booked via Calendly: 30-min intro call first to confirm stack and chemistry fit\ • 50% of monthly fee upfront, 50% on month-end\ • If we ship nothing meaningful in a month (rare, but possible), you pay only 50%\ • I take a 1-week scheduled break every quarter (announced upfront, planned around your roadmap) NOT included\ • Design work — I work from your design system, Figma files, or component library\ • Marketing site / content / copywriting\ • Customer support operations\ • Off-hours / weekend / holiday on-call (separate emergency retainer if needed)\ • More than 80 hours in a month — if scope grows, we upgrade tier or scope down Tech stacks I work in fluently\ Mobile: Flutter (Dart), FlutterFlow when appropriate\ Web: Next.js 14, React 18, TypeScript, Tailwind\ Backend: Firebase (Auth, Firestore, Cloud Functions), Supabase (Postgres, RLS, Edge Functions)\ Payments: Stripe (Subscriptions, Connect, webhooks)\ Infra: Vercel, Sentry, Resend Proof: 4-month engagement on CallidusOS — 1,887 commits, multi-tenant SaaS shipped and live with UK aesthetic clinics. Solo build, retainer-style cadence,\ weekly demos, async-first. Book a 30-min intro call to discuss your stack, your roadmap, and whether we're a fit.

Requirements

To quote accurately: - Your app concept and must-have features - Will you maintain the app yourself, or need ongoing support? - Branding assets (logo, colors) - Reference apps with similar functionality - Backend preference (Firebase or Supabase) - Launch timeline I'll send a detailed proposal after reviewing your requirements.

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