A living system for two hundred stores that share a roof, a corridor, and almost nothing else.
La Part-Dieu is one of Europe's largest urban malls. Three floors, hundreds of brands, a single roof. Every store runs alone, calling a headquarters 500 km away to fix a problem the neighbour could solve in two minutes. The paradox isn't physical. It's organisational.
I spent six weeks on the floor. Not interviewing, just walking, watching, listening. The corridor is where the real conversations happen. The back-office is where they get buried.
What looks like a mall from above is, from inside, a constellation of silos pretending to be a network. Each store has its own heat, its own stress, its own surplus. Most of it stays hidden until something breaks.
Interviews give answers. Observation gives the truth. Most managers couldn't describe the workarounds they used every day, those workarounds had become invisible to them.
Two managers swap mannequins in the corridor without paperwork. Trust is fast, informal, and totally invisible to the upper layers of both companies.
11 managers in a "vital" group. 30% reply rate. Urgent requests get buried under emoji reactions and weather small-talk within minutes.
One store waits 4 hours for a pallet jack. Three sit idle 38 metres away. Both managers will later swear there was nothing they could do.
Every manager keeps a mental scorecard of who owes whom. None of them write it down. Trust is real currency, but it lives entirely in their heads.
Lighting stuck on full power floor 3, while floor 2 runs heaters. Both teams know. Neither has a way to surface the imbalance to the other.
One terminal fails at 13:24. Four-hour SLA from HQ. The neighbour has the exact same model on a shelf, with three spares. They never spoke.
From 23 interviews and 11 shadowing sessions, three recurring profiles emerged. Each lives the same paradox from a different angle. Each tells the system what it should become.
"They were 8 metres away. I went through HQ for 3 days."
"11 contacts on WhatsApp. Half the messages get buried."
"Surplus staff on weekends, no one to call."
Every operator runs a private mental ledger of favours. Every floor has its informal alliances. The fabric is already there, woven into the corridor. Nothing in the existing tool landscape sees it, surfaces it, or scales it.
Slack and Teams reach the right quadrant but were not built for operational urgency. WhatsApp lets people collaborate but buries the urgent under the noise. ERP systems are rigorous and locked to a single store. The top-right quadrant, collaborative and proactive, belongs to no one.
What if proximity could speak?
What if a corridor, a roof, a floor, a fault
could become a single living signal
that matches needs and surplus in real time?
Synapse is not an app. It's the connective tissue between stores. A distributed metabolism running across 200 nodes, watching seven resource flows, surfacing imbalances before they become crises. Humans validate. Machines orchestrate.
The interface inherits the heat map. Black background turns OLED pixels off, saving battery for an entire shift. Each cell encodes a resource value as colour. Tension is felt before it's read. The manager always validates the final move.
Peak weekend. A power surge fries two payment terminals at Zara. Without Synapse, the fix takes four hours. With Synapse, the fix takes four minutes, and uses what was already on the same floor.
Power surge fries two payment terminals during peak hours. Manual queue forms. Floor manager logs an incident.
The store's resilience score drops 18 points. The OS broadcasts an anonymised request to the floor: "Need · Verifone V200c · qty 2 · urgent."
FNAC's stockroom holds 3 unused terminals from last quarter. The system surfaces the match. Both managers receive a single tap-to-validate prompt.
Two staff members meet at the agreed point, scan a QR, exchange the units. The corridor protocol gets digital memory for the first time.
Queue drains. Resilience score climbs back to 89%. HQ is informed asynchronously. Saturday afternoon revenue is saved.
Synapse listens to what already exists and gives it memory, urgency, and reach.
The hardest part wasn't designing the OS. It was earning the right to not redesign the people. The fabric exists. The fix is to give it a frequency.
What stayed with me is that infrastructure is rarely about hardware. It's about whose pain becomes legible to whom. Synapse is a hypothesis: that proximity, given a voice, is the most under-used resource in the modern city.
OLED black saves an entire shift's battery. The aesthetic is the policy.
AI surfaces, humans validate. Every match needs a tap, a corridor, a QR.
k-anonymity ≥ 5 across all signals. No store ever sees another's raw data.
The dashboard is felt before it's read. Cold purple to hot orange. No charts.
Synapse is one OS layer. The protagonist is always the corridor.