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Built a multi-tenant SaaS platform for animal breeders and breed registries from scratch. Registry version supports Stripe Connect for membership dues, event fees, and registration fees. Breeder version includes waitlist management, pedigree builder, and SEO-optimized websites. Species agnostic, fully customizable per organization. Stack: TypeScript, React, Node.js, PostgreSQL, Stripe Connect, AWS, Redis.
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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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this is looking amazing, @Jan Mráz
I'm a developer and I kept running into the same frustrating problem when delivering work to clients: I'd redesign a website, rework a layout, or overhaul a visual identity - and I had no good way to actually show what changed.
I wanted something where I could upload a full-height before screenshot and a full-height after screenshot - the kind that are 4000-6000px tall - and let the client scroll through both, see exactly what moved, what was added, what was removed. Everything I found either cropped the image, didn't support full-page screenshots, or gave you a basic slider with zero context.
So I built my own using Next.js, Firebase, Clerk and Stripe.
Splice View allows you to:
Upload full-height before & after screenshots (the entire page or design, not just what's visible on screen)
Add numbered annotation boxes directly on the image to call out specific changes
Share a single link with your client - no login required on their end
They scroll through the full comparison and see exactly what changed and where
It works for anything visual - website redesigns, landing page updates, UI mockups, graphic design revisions, app screens. If you deliver visual work to clients, this is for you.
Right now it's desktop-optimized and focused on photo comparisons with annotations. We're still in the beta so you might find bugs. Video recording mode is in the works.
The deal:
You can use the app without restrictions. All I ask in return is honest feedback - what's confusing, what's missing, what would actually make this part of your workflow.
Thank you for the attention!
Looks like a cool project
Building Blockchain Infrastructure and SEO-Driven Web Platforms at ConstructKoin
Working as a Senior Blockchain Engineer at ConstructKoin gave me the opportunity to build both blockchain infrastructure and scalable web systems in the Web3 and real-estate finance space.
ConstructKoin is building an AI-powered real-estate backed blockchain finance ecosystem, combining tokenized finance with real-world asset-backed lending. ()
My role covered smart contract architecture, presale systems, dashboard development, and SEO-focused web platforms.
Built and deployed the token presale smart contract, handling token distribution logic, purchase validation, and secure presale workflows.
Designed the blockchain transaction flow for investor participation, wallet integrations, and token claiming systems.
Developed the admin panel for managing users, token sales, analytics, and platform operations.
Built the user dashboard where investors could track purchases, manage allocations, and monitor token-related activity.
Developed backend systems using Node.js for secure API management, user authentication, transaction tracking, and dashboard operations.
Built frontend systems using React.js to create fast, scalable, and user-friendly investor experiences.
Integrated wallet connection systems and payment workflows for seamless token purchases.
Worked on blockchain logic optimization, contract interaction handling, and transaction reliability improvements.
Built and optimized WordPress websites for marketing and organic growth with strong technical SEO foundations.
Improved SEO performance through optimized architecture, Core Web Vitals improvements, structured data, metadata systems, and search indexing optimization.
Implemented scalable content structures and conversion-focused landing pages to support token marketing campaigns.
This experience allowed me to combine blockchain engineering with product development and SEO strategy, building systems that were both technically strong and growth-focused.
Working across smart contracts, backend systems, frontend dashboards, and SEO-focused web platforms strengthened my expertise in full-cycle Web3 product development.
Blockchain products are not only about smart contracts — they need strong infrastructure, seamless user experiences, and scalable growth systems to succeed.
ConstructKoin was a great example of building all of those together.
Sounds great!!!
How did you implement fiet-crypto payments?
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