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Over the last 4 years of building B2B SaaS backends, I've seen simple architectural oversights cause major production headaches — like default singleton scoping in multi-tenant apps leading to cross-request leaks.
I'm currently accepting new freelance contracts and backend projects on Contra! 🚀
Available for:
• Node.js & NestJS backend architecture & microservices
• High-performance REST API development
• Database optimization & migrations (PostgreSQL, Prisma, MongoDB)
• Auth systems & third-party integrations
Shoot me a direct message to collaborate!
The network for creativity
Join 1.25M professional creatives like you
Connect with clients, get discovered, and run your business 100% commission-free
Creatives on Contra have earned over $150M and we are just getting started
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Crenaly: a booking SaaS I designed and built end-to-end for appointment-based businesses in France: salons, barbers, beauty and wellness.
The core idea: when a client cancels, the freed slot is automatically offered to clients who asked for an earlier time. The first to accept gets it, their appointment moves in place, and the slot they leave is offered next. No double booking, no manual work.
Around it, a full product:
→ Branded booking page for each business, embeddable on their own site
→ Mobile-first booking flow, no account needed
→ Agenda, client management, team roles & permissions
→ Verified reviews, analytics, Stripe billing
Product, UX/UI, frontend and backend.
Next.js · TypeScript · NestJS · PostgreSQL · Redis
Automatically offering a cancelled slot to the next client is such a practical feature for salons and barbers. Designing and building Crenaly end to end must have made those flows much tighter.
Built myself a little command center for my freelance work this week. It’s called Bench.
Contra handles the contracts and payments, but my day-to-day was scattered across Contra chats, Gmail, my calendar, Notion, and a notes app. So I pulled it all into one place:
• A dashboard showing what needs me today: unread messages, overdue tasks, past-due invoices, leads that have gone quiet
• Each project gets its own page with scope, deliveries, tasks, links, and the full message thread from Contra and email
• A pipeline for leads, including a “Ghosted” column, because we’ve all been there
• A time tracker for the hourly stuff
• It syncs with my Contra projects and invoices every morning
Curious how other freelancers here keep track of everything. Spreadsheets? Notion? Pure chaos?
Hey, Mr. @Chris Luniewicz This is honestly impressive! I'm also curious to know what tech stack you used to build 👍
Just signed off on a project @Contra
Client reached out from Behance (which is wild, I know), looking for a B2B landing page for fintech / POS (point-of-sale) software company.
Hopped on a discovery call right away and discussed a few key things, and the client knew immediately I was the right person for the job.
What's crazy is that I also offered motion design services, and he said, "Yes, please!"
Great clients don’t haggle.
They know what they want and move fast.
Excited to get started!
Love that a client found you on Behance and it turned into a B2B fintech landing page. Jumping on a discovery call right away probably made all the difference.