Hi everyone,

I'm a developer currently evaluating the technical scope of a fleet tracking and operations project, and I'd love to get some experienced input from this community.

We've been exploring what's involved in delivering proper fleet management app development services—things like real-time GPS data streams, driver behavior monitoring, route optimization engines, and predictive maintenance modules. The backend complexity alone seems significant, and I'm trying to figure out where most teams spend their effort.

A few specific questions I'm wrestling with:

1. Architecture choices:
When building scalable fleet management app development solutions, do most teams lean toward microservices or a monolithic backend in the early stages? Real-time telemetry from hundreds of vehicles seems like it could overwhelm a monolith quickly, but microservices introduce their own coordination overhead.

2. On the cost side:
Fleet Management App Development Cost varies wildly in the estimates I've seen—anywhere from $30K to $200K+ depending on feature scope. For developers who've worked on similar projects, what features tend to blow up the budget the most? (My guess is real-time data processing and third-party hardware integrations.)

3. Vendor landscape:
Are there fleet management app development companies that are known in developer circles for building strong, API-first platforms rather than black-box solutions? I've come across Dev Technosys as one name in this space—has anyone evaluated or worked alongside firms like this, or have comparisons with other vendors from a purely technical standpoint?

4. Tech stack opinions:
For fleet management app development specifically, what's the community's take on the following?

• WebSockets vs. MQTT for vehicle telemetry?
• PostgreSQL with PostGIS vs. dedicated time-series DBs like InfluxDB?
• React Native vs. Flutter for the driver-side mobile app?

Would genuinely appreciate any insights, especially from those who've dealt with high-frequency GPS data or multi-tenant fleet platforms. Thanks in advance!