George Jose

Engineering leader, indie hacker, sailor & dog parent

Building @TitanGymApp in my free time

[George Jose @george__jose]

Been a big fan of @powersync_ for a long time! Deeply researched alternatives at the time, and have kept a close eye on the space ever since.

I haven't seen anything that does quite as much, while staying relatively unopinionated and open ended.

So much of day to day building comes down to moving data from one place to another, and a sync engine simplifies so much!

[George Jose @george__jose]

@mustafa01ali @matzatorski @Shopify If you haven't already come across it, https://t.co/OZYZwPU1f6 might help

[George Jose @george__jose]

@lydiahallie Yes!

[George Jose @george__jose]

I don't know if this is a new feature or I'm just noticing it now, but thanks Anthropic.

Makes it so I can kick off some long running sessions at night and continue in the morning, without having to worry about burning a million uncached tokens.

[George Jose @george__jose]

@RobSwish @1Password Had the exact same thought yesterday while I was trying to log into X on safari on golden gate. Terrible UX, but I don’t know how much of that is safari and how much 1P.

[George Jose @george__jose]

@thdxr 100%

[George Jose @george__jose]

@deanwball “I don’t like it, so it must be communism”

[George Jose @george__jose]

Got a chance to go real low level and optimize performance on @TitanGymApp this weekend.

The result: actions across the board are ~2.9x as fast as before.

[George Jose @george__jose]

@vinvan @trq212 https://t.co/GoIVHY9m7b

Based on the first point on here, it’s definitely against terms.

[George Jose @george__jose]

@karpathy Maybe publish a homebridge plugin while you're at it!

[George Jose @george__jose]

Wrapping up a great year with workouts on @TitanGymApp, and hoping to be more consistent in 2026

[George Jose @george__jose]

@jsharkey What sync engine is it using? Is it an in-house one?

[George Jose @george__jose]

@k081e @TitanGymApp Super helpful, thanks for this!

[George Jose @george__jose]

Had a scary almost 40min period where I couldn't even ssh into the EC2 instance that powers @TitanGymApp

Root cause turned out to be exceeding provisioned IOPS & throughput on the EBS volume.

Some thoughts:
- Sentry's uptime monitor is really useful
- AWS limits how many EBS changes you can make during a time window (I was able to quickly increase IOPS, but it didn't let me provision more throughput for another 6 hours. I probably could've batched both these changes instead of trying it one by one.)
- Despite this downtime, I still have a 99.895% availability L30D
- Because of the underlying sync engine based architecture on the app, all existing users would've experienced 0 interruptions (new users would've been unable to sign up though)

[George Jose @george__jose]

@Baconbrix @expo @Baconbrix wondering if you have an estimate on when expo 54 is planned to exit beta

[George Jose @george__jose]

@dylanbond101 @desmondhth Some types of friction can actually be very good

[George Jose @george__jose]

A typical json file containing geolocation data for an outdoor workout on @TitanGymApp:

- uncompressed: ~725KB
- gzipped: ~99KB

Happy to have caught this early before my s3 costs go up.

[George Jose @george__jose]

@powersync_ I'd have imagined transport level compression (like gzip) existed already. Good to know there's a proposal for that.

[George Jose @george__jose]

@powersync_ This would be huge