ShiftFill - Self-Service Shift Swap Marketplace for Hourly Retail and Hospitality Teams
Shift managers at retail and restaurant chains spend 2 hours every Sunday texting staff to fill open shifts because their scheduling software has no self-service swap layer. ShiftFill is a mobile-first marketplace where employees post and claim open shifts in real time with manager approval in one tap.
Difficulty
intermediate
Category
SaaS
Market Demand
Very High
Revenue Score
8/10
Platform
Web + Mobile
Vibe Code Friendly
No
Hackathon Score
🏆 7/10
What is it?
The April 2026 labor market has hourly managers drowning in last-minute shift coverage because every scheduling tool treats shift swaps as a manager task instead of a worker-to-worker marketplace. ShiftFill adds a self-service swap and pickup layer on top of existing schedules: employees post available shifts, eligible coworkers get push notifications, and managers approve swaps with one tap instead of 15 texts. Eligibility rules (role, overtime cap, location) are enforced automatically. Built as a PWA with React Native Web, Supabase Realtime, and Expo push notifications, this ships in 3 weeks. The hourly workforce scheduling market is validated by 7shifts, Homebase, and Deputy — all multi-million ARR products. ShiftFill does not compete with scheduling but adds the one layer they all handle poorly.
Why now?
Supabase Realtime became stable enough for production push-style apps in 2025, and Expo's PWA support means one codebase covers web and mobile — making a two-sided real-time marketplace shippable solo in under 3 weeks for the first time.
- ▸Employee-facing shift marketplace where workers post and claim open shifts instantly.
- ▸Eligibility rule engine enforcing role match, overtime cap, and location before notifying eligible employees.
- ▸One-tap manager approval with automatic push notifications to all parties on decision.
- ▸Weekly manager digest showing swap volume, coverage rate, and time saved versus manual coordination.
Target Audience
Shift managers and owners at retail and restaurant chains with 10-80 hourly employees — estimated 500,000 locations in the US using outdated text-based shift coordination.
Example Use Case
A Subway franchisee owner stops spending Sunday evenings texting 18 employees to cover a Monday morning shift. An employee posts the open shift at 8pm, two coworkers claim it, the manager approves in one tap at 8:05pm, and everyone gets a push notification.
User Stories
- ▸As a shift manager, I want employees to post and claim open shifts themselves, so that I stop spending two hours every Sunday on coverage texts. As an employee, I want to see available shifts I am eligible for and claim them instantly, so that I can pick up extra hours without calling my manager.
- ▸As a franchise owner, I want to see weekly swap volume and coverage rates, so that I know which locations are self-sufficient and which need intervention.
Acceptance Criteria
Shift posting: done when employee can post an open shift and eligible coworkers receive a push notification within 60 seconds. Eligibility enforcement: done when an ineligible employee (wrong role or overtime risk) does not receive or see the shift notification. Manager approval: done when manager can approve or reject a swap in one tap and all parties receive push confirmation. Weekly digest: done when manager receives an email every Monday showing prior week swap volume and coverage rate.
Is it worth building?
$39/month x 100 locations = $3,900 MRR by month 3. $149/month x 30 chain accounts = $4,470 MRR additional. Combined $8,370 MRR is realistic with a focused launch into the r/restaurantowners and r/retailmanagers communities.
Unit Economics
CAC: $60 via direct outreach to restaurant owner Facebook Groups. LTV: $1,170 (30 months at $39/month average location lifespan). Payback: 2 months. Gross margin: 88%.
Business Model
Per-location SaaS at $39/month per location, $149/month for chains with up to 5 locations.
Monetization Path
30-day free trial per location. Upgrade triggered when manager approves more than 5 swaps in the trial period — proving value before asking for payment.
Revenue Timeline
First dollar: week 4 via first paying location. $1k MRR: month 2. $5k MRR: month 6. $10k MRR: month 12.
Estimated Monthly Cost
Vercel: $20, Supabase: $25, Expo push service: free up to 1k devices then $29, Resend: $10, Stripe fees on $5k revenue: ~$150. Total: ~$234/month.
Profit Potential
Full-time viable at $8k-$15k MRR. High acquisition target for 7shifts or Homebase.
Scalability
High — add payroll integration, tip reporting, and a multi-location chain dashboard for franchisors.
Success Metrics
Week 3: 5 live locations. Month 1: 20 locations active. Month 2: less than 5% monthly churn.
Launch & Validation Plan
Post in r/restaurantowners asking how managers handle last-minute shift changes. Recruit 5 beta managers from replies before writing any code.
Customer Acquisition Strategy
First customer: DM 20 restaurant owners in local Facebook Groups for restaurant managers offering 60-day free trial in exchange for weekly feedback. Ongoing: r/restaurantowners, r/retailmanagers, franchise owner Facebook Groups, cold email to independent restaurant groups with 3-10 locations.
What's the competition?
Competition Level
Medium
Similar Products
7shifts includes shift swaps but requires full platform migration at $29/month+ and has no self-service marketplace UX. Homebase has swap requests but no eligibility automation. WhatsApp group chats are the dominant workaround — zero structure, zero manager visibility.
Competitive Advantage
7shifts and Homebase require full scheduling migration. ShiftFill works alongside any existing schedule tool as a swap layer with zero migration cost.
Regulatory Risks
Low regulatory risk. Overtime eligibility rules must not be used to discriminate by protected class — document that rules are role and hour based only. No HIPAA, no financial regulation.
What's the roadmap?
Feature Roadmap
V1 (launch): shift marketplace, eligibility engine, manager approval, push notifications. V2 (month 2-3): weekly digest, multi-location manager view, shift history. V3 (month 4+): chain dashboard for franchisors, 7shifts calendar import, payroll hours export.
Milestone Plan
Phase 1 (Week 1-2): Supabase schema, eligibility engine, shift posting and claiming flow working end-to-end. Phase 2 (Week 3): push notifications, manager approval screen, Stripe billing live. Phase 3 (Month 2): 20 live locations, weekly digest emails, TestFlight beta.
How do you build it?
Tech Stack
React Native Web (Expo), Supabase Realtime, Supabase Auth, Expo Push Notifications, Stripe, Node.js Edge Functions — build with Cursor for backend logic, Lovable for mobile UI.
Suggested Frameworks
Expo, Supabase Realtime, React Native Web
Time to Ship
3 weeks
Required Skills
Expo push notifications, Supabase Realtime, React Native Web, Stripe billing.
Resources
Expo push notification docs, Supabase Realtime docs, Stripe billing quickstart.
MVP Scope
auth flow (Supabase), employee invite system, shift posting UI, eligibility engine, swap request flow, manager approval screen, push notification handler, location settings, Stripe checkout, weekly digest email.
Core User Journey
Manager creates location -> invites employees via SMS link -> employee posts open shift -> eligible coworker claims it -> manager approves in app -> coverage confirmed in under 10 minutes.
Architecture Pattern
Employee posts shift -> Supabase insert -> Edge Function checks eligibility rules -> Expo push sent to eligible workers -> worker claims shift -> Supabase Realtime updates manager dashboard -> manager approves -> push notifications to all parties -> swap record finalized.
Data Model
Location has many Employees. Employee has many Shifts. Shift has many SwapRequests. SwapRequest has one status (pending, approved, rejected). Location has one EligibilityRuleSet.
Integration Points
Supabase Realtime for live swap updates, Expo Push Notifications for employee alerts, Stripe for location subscriptions, Resend for weekly manager digest, Supabase Auth for employee and manager accounts.
V1 Scope Boundaries
V1 excludes: payroll integration, POS sync, multi-location chain dashboard, shift trading for future weeks beyond 7 days, desktop app.
Success Definition
A restaurant owner the founder has never met finds ShiftFill via Google, signs up, gets their team onboarded, and pays month two without any founder intervention.
Challenges
Churn is the existential risk — if a single location stops using it for two weeks during a slow period, the habit breaks and they cancel. Engagement loops and weekly manager digests are not optional features, they are retention mechanisms.
Avoid These Pitfalls
Do not build payroll integration in V1 — it will take 6 weeks and delay launch past the validation window. Do not allow employees to approve their own swaps — add manager approval as a hard system constraint or you will get labor compliance complaints. Finding your first 10 paying locations takes 3x longer than building the app — start outreach before you write a line of code.
Security Requirements
Supabase Auth with magic link for employees, RLS on all location and employee data, managers can only see their own location data, rate limit swap claims to prevent gaming at 10 req/min per employee.
Infrastructure Plan
Vercel for web shell, Expo EAS for mobile builds, Supabase for Postgres and Realtime and Auth, Sentry for error tracking, GitHub Actions for CI, dev and prod Supabase projects.
Performance Targets
Launch: 200 DAU across 20 locations, 2,000 Realtime events/day. Push notification delivery under 5 seconds. App shell load under 1.5s. Supabase Realtime for live manager dashboard updates.
Go-Live Checklist
- ☐Security audit complete
- ☐Payment flow tested end-to-end
- ☐Sentry live and catching crashes
- ☐Supabase monitoring configured
- ☐Custom domain with SSL set up
- ☐Privacy policy and terms published
- ☐5 beta restaurant managers signed off on core swap flow
- ☐Rollback plan: Vercel instant redeploy plus Supabase migration rollback script
- ☐Launch post drafted for r/restaurantowners and ProductHunt.
How to build it, step by step
1. Initialize Expo project with React Native Web support and TypeScript. 2. Set up Supabase schema: locations, employees, shifts, swap_requests, eligibility_rules tables with RLS. 3. Build Supabase Auth email magic link flow for employee onboarding via SMS invite. 4. Create shift posting screen where employee selects shift from their schedule and marks it available. 5. Build eligibility engine Edge Function that queries employees by role and checks overtime hours before sending pushes. 6. Implement Expo push notification send via Supabase Edge Function on new swap availability. 7. Build manager approval screen with Supabase Realtime showing live pending swaps. 8. Add Stripe $39/month Checkout gated behind location setup completion. 9. Set up Resend weekly digest showing swap volume and coverage rate per location. 10. Deploy to Vercel (web shell) and publish Expo app to TestFlight and Play Store internal track.
Generated
April 6, 2026
Model
claude-sonnet-4-6