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I designed and built SYNAPZ Network Stability, a full-stack connectivity-intelligence platform for diagnosing intermittent internet, Wi-Fi and voice-call problems.
The system continuously measures latency, jitter, packet loss, gateway responsiveness and connection interruptions, then converts the evidence into plain-language diagnoses, incident timelines and downloadable technical reports.
It includes secure user accounts, private device pairing, a Windows telemetry agent, mobile browser testing, offline buffering, user-scoped data isolation, privacy controls and evidence-led reporting.
The product is being expanded into dedicated experiences for home users, gamers, remote workers, businesses and managed IT providers.
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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🚨 A bug that looks like a frontend problem might actually be your backend.
I once spent time checking UI code, only to find the real issue was an API returning the wrong data.
When debugging, I always check the full data flow:
Frontend → API → Backend → Database
Debug the source, not just the symptom. 🔍
Have you ever found a backend bug while fixing a frontend issue?
Super clear root cause analysis! That non-existent /admin/login target loop catches a lot of devs off guard. Minimal diff, solid verification steps. Great job!
Designed the mobile app Contra never built 20+ screens, one Flowstep canvas, zero guesswork.
Contra's an all-in-one freelance platform, but it's web-only. So for the #FlowstepChallenge I designed the entire thing as a native mobile app onboarding, home feed, messages, wallet, payments, discover, jobs every screen prompted directly on the canvas.
Mapped every desktop flow to real mobile patterns: two-column messages → single-column with push navigation. Side panel AI assistant (Co-Agent) → on-demand bottom sheet. Side-by-side wallet cards → stacked with balance as the hero. Every layout decision justified by mobile ergonomics, not just shrunk down from web.
Locked in one design system across every screen unified nav bar, one icon set, consistent tokens, working back navigation, and smooth transitions end to end. No dead clicks, no inconsistent icons between screens, no "looks like 7 different apps stitched together.
The workflow:1 Prompt Flowstep canvas per section 2 Batch-fix consistency across screens 3 Wire up navigation + animation 4 Full click-through test
One canvas, one system, a fully connected mobile Contra.
THE OG TOOL — @Flowstep x @Contra HQ
#buildinpublic #AIworkflow #FlowstepMCP #ContraApp #MobileDesign #ProductDesign
Every dev portfolio has the same wall of tech logos.
I kept looking at mine and thinking, anyone could have built that.
And tbh, dropping a React logo on a page proves nothing about whether I know what to do with it.
So I let my creative side off the leash and made the grid draggable.
You pull the stack you want to build into a box, and my site tells you what it thinks of the combination.
Behind it sits a rules engine I wrote.
42 rules, 32 of them are warnings.
It doesn't rate individual tools, instead it judges combinations.
Because that's where the expensive mistakes usually happen, and every verdict ends with what I'd pick and why.
Two of the 24 tiles are jokes (Pure Magic and Unlimited Wishes) to make it more fun.
And the whole point?
A skills list asks you to trust me.
But this one puts my judgment somewhere a potential client can understand my though process before hiring me.
It's live and you can drag in your own stack: https://codingwithmarcel.com/#experience
If it hands you a verdict you disagree with,
please tell me, so I can fix the rules engine.