A profile of Riley Walz, whose tech-related pranks in San Francisco blend technical skill with social commentary, including a viral site to track parking police
Heather Knight / New York Times : X: @rtwlz , @ritwikpavan , @yimbyland , @tbpn , @questionableway , @rowanfornow , @pitdesi , @bryancsk , @opinonhaver , @humantransit , @armanddoma , and @terronk . Forums: r/sanfrancisco X: Riley Walz / @rtwlz : @_mattwelter the city has taken down the entire ticket site for “maintenance” for last few hours, so i can't refresh data and no one can pay their tickets... if it's because of me, what a reaction Ritwik Pavan / @ritwikpavan : Most of my followers don't know this, but my first startup built wireless cameras using computer vision to capture real-time curb data for cites. We raised $5M+ and scaled across cities like @NYC_DOT, @MyFDOT, and @austintexasgov. The data helped cities cut traffic, improve [image] @yimbyland : Unpopular opinion: Pay your fare, losers. @tbpn : .@rtwlz on how he built “Find My” for parking cops: “I figured out you could scrape the SF parking ticket system to reveal more or less the real-time locations of parking officers. So I made a site that looks like Apple's Find My Friends, except it shows where the parking cops [video] Just Matt / @questionableway : like every other app at this point is just a way to brake some existing social contract Rowan Fornow / @rowanfornow : Isn't this is the same guy who made a program to track every Citibike in New York and tried to use it to track down the United Healthcare CEO's killer only to “we did it reddit” a random person? Follow up question: can we take away his internet access? Sheel Mohnot / @pitdesi : This is fun. A real-time report of parking cops in San Francisco. This officer gave 71 tickets, for ~$7,500 so far this morning (4 hours in!). You can see where they are ticketing in real-time to avoid them! [image] Bryan Cheong / @bryancsk : They've recreated the Summon Auntie app from 2011 but in San Francisco [image] William B. Fuckley / @opinonhaver : “with my new app, Defectr, you can more easily opt out of adhesion to any kind of social contract or obligation to maintain any kind of commons. you're wasting dozens of hours monthly meeting basic obligations to other people. get that time back.” Jarrett Walker / @humantransit : If you are outraged by some transit riders not paying the fare, I hope you are equally outraged about this. Armand Domalewski / @armanddoma : it's kind of insane how people kind of vaguely root against parking enforcement when the streets would be a total mess without them. good luck finding parking if people can just plop their cars in a spot permanently or block your driveway Lee Edwards / @terronk : This guy made a site that reverse engineers the SF parking ticket system and within hours, the city pushed breaking changes to their system to cripple the app. I don't ever want to hear about how long it takes to ship software in city government ever again. Forums: r/sanfrancisco : Someone reverse engineered SF's parking ticket system and made a real-time parking enforcement tracker
Context & Ripple Effects
Walz's project sits in a long-running tension between civic-facing tools and municipal control of enforcement systems. San Francisco had previously blocked a parking-ticket assistance app, while Walz's earlier CitiBike tracker shows his use of public-facing system data to make city operations legible.
The episode also lands amid expanding visibility into automated and networked monitoring: the crowdsourced map of license-plate-reader cameras illustrates how technical communities are documenting enforcement infrastructure from the outside.
First-order effects
- San Francisco's reported breaking changes and maintenance outage immediately disrupted Walz's tracker and, for several hours, the public's ability to refresh ticket data or pay tickets.
- Walz's reverse-engineering work turns the parking-ticket system into a contested interface: the city must now weigh operational access against exposing real-time enforcement activity.
Second-order effects
- Other civic-data builders and researchers get a clearer signal that unofficial access to municipal systems can be fragile, especially when a tool changes the behavior of people being monitored or enforced against.
- The response may push cities toward more deliberately designed, authenticated data access rather than leaving operational information exposed through public transaction systems; that can improve resilience but reduce informal transparency.
Third-order effects
- If cities increasingly treat enforcement data as a security-sensitive surface, public transparency will depend less on what can be technically extracted and more on explicit policies governing access, reuse, and appeal.
- The broader contest is over asymmetric visibility: residents can use software to observe government operations, while governments deploy increasingly data-rich tools to observe residents, as seen in vehicle-tracking systems pitched to transit agencies.
The trend: Civic technologists and municipal agencies are entering a sharper contest over who controls the data exhaust of urban enforcement systems.