Alas, I was stymied by not having any cash to work on it, and the unit economics were not very VC friendly (at least I assume that’s one of the reasons why I didn’t get any traction from VCs).

This week I’m thinking about whether it makes sense to provide a location history ‘vault’, designed to let users expose their location history to LLM’s as context.

I’ve spent a while understanding what sort of market would make it viable. I think it does actually work if you can square: 10K participants per major metro area, revenue of about 2.9M per metro area (so say, 5K monthly recurring with about 50 customers).

At that point you could pay data union participants about $5 a week to share their location data with you.

From talking to some previous data union folks, the major challenges are paying out (my target is much higher than any union managed), and people dropping out over time.

My bet is that these are both solvable things by selling data products rather than just bundles of data, and the data source being very passive.

I’m also interested in the idea that such a union should act more like a union than previous efforts in this space, by actively defending members’ data from brokers.

What I’m trying to understand is whether it is viable to pay people ~$5 per week for sharing their location data and demographics based on a 90% share of revenue from sales of data products built on that data. (But without ever selling or exposing individual level data).

More or less my initial approach to this is you take a grid, and you show movements/density on that grid. If necessary you coarsen the grid to avoid reidentification of individuals, and ultimately to get a good picture of the population given the biased sample which is the union membership, you need a statistical model on top which also helps from a privacy perspective.

State actors demanding individual location history is definitely an issue. I have a few possible approaches in mind to defend against that.

The union monetises this by selling privacy preserving aggregates (think ‘where is everyone in London right now’, or ‘where did people commute from?’), and acts on behalf of union members to stop data brokers selling their location data.

Then I switched to cursor and iterated with it on making it work. Once I had the iOS app running, I got cursor to create an android app that looked and functioned the same.

Super interesting experience - took a couple of days of iterating here and there, helped to have them in git repos for when cursor went too far off piste.

Both apps work, they look pretty much like my original picture.. and the code is absolute trash. I don’t know swift, or particularly kotlin, but the code is horrendous. If you wanted to take them any further, you’d rewrite it from scratch.

This was. Rating combinations of Claude 3.7, 4.0 thinking, Gemini 2.5, and chatgpt 4. (Switching between agents when one was getting stuck.)

Observationally, they all had a much harder time with android and rarely produced anything that didn’t need fixing to build.

Great for rapid prototyping in a stack I don’t know, but 100% tech debt.

I figure the solution is to pay people for their location data, and be up front and transparent about collecting it.

Still looking for someone to join my small but wily team of engineers and help me build a new, open source (https://github.com/Flowminder/flowkit-ui and https://github.com/Flowminder/flowkit-ui-backend), data platform for the humanitarian and development sector. (There's lots of other interesting and impactful things to get your teeth into as well, but the role is primarily for this project to start with).

Flowminder is a pioneering, internationally operating non-profit organisation that supports disaster relief and development efforts through several products including the analysis of data gained from mobile phones and household surveys in ethical, privacy and security preserving manners.

We use things like: React, Linux, Mapbox, Deck.gl, Python, FastAPI, Docker, make, PostgreSQL/MySQL, Terraform, CircleCI, Github, GCP, OpenAPI, Auth0

I can also promise you no stupid interview process - you, me, and a couple of the engineers have a chat about you, us, and things you have worked on and the kind of work you’d do with us. If you’ve got a GitHub/bitbucket/gitlab/whatever that’s great, and we’ll look at it, but not everyone’s work is public, and not everyone develops as a hobby, and those things are entirely reasonable as well!

https://www.flowminder.org/about-us/work-with-us/full-stack-...

I'm looking for someone to join my small but wily team of engineers and help me build a new, open source (https://github.com/Flowminder/flowkit-ui and https://github.com/Flowminder/flowkit-ui-backend), data platform for the humanitarian and development sector. (There's lots of other interesting and impactful things to get your teeth into as well, but the role is primarily for this project to start with).

We use things like:

React, Linux, Mapbox, Deck.gl, Python, FastAPI, Docker, make, PostgreSQL/MySQL, Terraform, CircleCI, Github, GCP, OpenAPI, Auth0

https://www.flowminder.org/about-us/work-with-us/full-stack-...

Flowminder is a pioneering, internationally operating non-profit organisation that supports disaster relief and development efforts through several products including the analysis of data gained from mobile phones and household surveys in privacy and security preserving manners.

We are now looking for an Infrastructure Engineer with excellent communication skills to facilitate and (depending on experience) drive and lead the expansion of our small but worldwide infrastructure and product installations in cooperation with key technology partners.

We use terraform, docker, linux, python, Postgres, airflow, GCP and anything else that gets the job done. Our infrastructure sits in mobile phone operators' data centres in interesting places around the world, and we use it to help people.

We value autonomy, a drive to make stuff better, and being curious.

Flowminder Foundation is looking for a senior developer to help us open source, and augment our mobile phone data analysis stack.

We’ve used this tool to do things like monitor displacement after natural disasters and conflicts and help understand disease spread in low and middle income countries.

Built on docker, python, and Postgres. We also increasingly use JavaScript for visuals, R if appropriate, and anything else that’s the right tool for the job at hand.

Diverse and friendly team of mostly academics (although we’re looking to increase our diversity on that score), free terrible coffee, lot of opportunity for travel to unusual places. We can’t currently sponsor visas, but are open to some degree of remote working. Full job spec is at http://www.flowminder.org/vacancies/senior-developer

Feel free to drop me a mail at Jonathan.gray at flowminder.org if you’ve got any questions!

Flowminder Foundation is looking for a senior developer to help us open source, and augment our mobile phone data analysis stack.

We’ve used this tool to do things like monitor displacement after natural disasters and conflicts and help understand disease spread in low and middle income countries.

Built on docker, python, and Postgres. We also increasingly use JavaScript for visuals, R if appropriate, and anything else that’s the right tool for the job at hand.

Diverse and friendly team of mostly academics (although we’re looking to increase our diversity on that score), free terrible coffee, lot of opportunity for travel to unusual places.

We can’t currently sponsor visas, but are open to some degree of remote working.

Full job spec is at http://www.flowminder.org/vacancies/senior-developer

We're looking for an awesome product manager to help us take several internal software tools open source, and help guide the vision for their future development.

Flowminder Foundation is a non-profit, working to analyse mobile phone data for good. We work with telecoms operators all over the world, and a bunch of humanitarian and development agencies, providing unique insights on human mobility.

Friendly, interesting place to work, with a really varied team of academics from all over the world, incredible variety of projects, and the opportunity to make a huge difference to people's lives.

We're also looking for a kickass analyst/data scientist. Applications here: http://www.flowminder.org/vacancies

We're looking for an awesome product manager to help us take several internal software tools open source, and help guide the vision for their future development.

Flowminder Foundation is a non-profit, working to analyse mobile phone data for good. We work with telecoms operators all over the world, and a bunch of humanitarian and development agencies, providing unique insights on human mobility.

Friendly, interesting place to work, with a really varied team of academics from all over the world, incredible variety of projects, and the opportunity to make a huge difference to people's lives.

We're also looking for a kickass analyst/data scientist. Applications here: http://www.flowminder.org/vacancies

At least until my child starts school, I wouldn't even consider working full time. Even then, I think the positive difference the extra time has made to me, and my family would make me think hard about going back to a 5 day working week.

Remote: Possible

Willing to relocate: No

Technologies: Python, SciPy/Numpy, R, Java, Javascript

Résumé/CV: http://greenape.github.io/cv/j_gray_cv.pdf

Email: j.gray@soton.ac.uk

I'm just finishing up a PhD in complex systems simulation and social statistics, where I've mostly been crunching social survey data, and building agent-based models in Python. Looking to apply my data wrangling and python powers to interesting problems.

Somewhat surprisingly, the median review score is 5, and if you look at median scores for products, the skew is very much left. So, the data pretty much backs up your observation!