A mobile app purpose-built for construction sites — offline-first, bilingual, and designed for a field worker to complete a full progress report in under 45 seconds. Every update flows back to the schedule, the superintendent, and the financial dashboard in real time.
The Field Worker's Interface
Carlos doesn't sit at a desk. He's on a job site by 6:30 AM, often in areas with poor cell coverage, working with tools in his hands. The BuildOS mobile app is designed around his reality: large touch targets, minimal reading, clear visual hierarchy, and full functionality with no internet connection.
The app is available on both iPhone and Android. It is available in English and Spanish — language is set per user account.
What Carlos Sees
Task List
When Carlos opens the app, he sees his assigned tasks for today — pre-filtered by his crew assignment, today's date, and his active project(s). He doesn't need to navigate or search. The list is sorted by priority: critical-path tasks appear first.
Each task card shows:
- Task name and WBS code (e.g., "Second Floor Framing — WBS 9.2")
- Current percent complete (from the last report)
- Scheduled start and finish dates
- A visual indicator if the task is on the critical path
- The next dependent task — so Carlos knows what unlocks when this is done
Progress Reporting
Tapping a task opens the progress report screen. The workflow:
Crew Check-In
At the start of each workday, Carlos checks in at the project site. One tap captures his GPS location, timestamps the arrival, and creates a site presence record. Mike sees the check-in in real time. No morning phone call needed. Check-ins are idempotent — tapping twice doesn't create duplicate records.
Daily Field Log
At end of day, Carlos can submit a brief daily log — a free-text note about what happened, any issues encountered, and what's planned for tomorrow. These logs are stored per project and visible to Mike and Sarah in the web dashboard. They serve as a lightweight site diary and can support lien waiver documentation and dispute resolution.
Offline-First Design
The BuildOS field app is engineered to work completely without internet connectivity. This is not a fallback mode — it is the primary mode. Here's how it works:
Push Notifications
Mike receives push notifications on his phone for key field events. These notifications are sent via Firebase Cloud Messaging (FCM) and arrive even when the app is closed:
| Event | Notification Content | Recipient |
|---|---|---|
| Task marked complete | "[Carlos] completed WBS 9.2 — Second Floor Framing. Next: Framing Inspection (Apr 8)" | Mike |
| Critical task overdue | "WBS 7.1 — First Floor Framing is overdue. Schedule impact: 2 days" | Mike |
| Weather alert | "Rain forecast tomorrow. 3 exterior tasks at Maple Estate may be affected." | Mike |
| Procurement critical | "ACTION: Order windows for Maple Estate by April 1 — 2 days remaining" | Mike & Sarah |
| Sub confirmed | "Joe Smith confirmed Plumbing Rough-In for April 8" | Mike |
| Sub delay reported | "DELAY: Joe Smith cannot make April 8 for Plumbing Rough-In. Schedule recalculating." | Mike |
Failed push notifications are automatically retried up to 6 times using exponential backoff (30 seconds to 1 hour between retries). Permanently failed notifications are logged in a dead-letter queue for manual review.
Data That Flows Back to the Office
Every action Carlos takes in the field creates data that immediately improves the accuracy of what Tom, Sarah, and Mike see in the web dashboard:
| Carlos Does | What Updates in the Office |
|---|---|
| Marks task 60% complete | Gantt chart updates; schedule progress percentage updates; Mike gets notification |
| Marks task 100% complete | Task closed; dependent tasks unlock; CPM recalculates new dates; Mike gets notification; Sub Liaison Agent may trigger SMS to next sub |
| Checks in at site | Site presence logged with GPS and timestamp; Mike sees crew is on-site |
| Submits daily log with issue note | Log stored and visible to Mike and Sarah in the project timeline |
| Takes a photo with progress report | Photo stored with GPS tag, timestamp, and linked to the task record — permanent documentation |
Bilingual Support
The BuildOS mobile app is available in English and Spanish. Language is set per user account by the organization admin. All task names, status labels, notifications, and UI text appear in the user's chosen language. The language setting does not affect the web dashboard — it applies only to the mobile app.
This is especially important for firms with mixed crews where English is not the primary language for all field workers. Accurate field reporting increases when the interface is in the worker's native language.