§ · Blog

Field notes from the BIM Mobius team.

Case studies, engineering posts, and library curation. Practitioner-tone, written by the people doing the work.

75 posts

BusinessJun 5, 2026(5 months ago)42 min read

Hiring senior engineers in 2026: the 4-stage interview that respects their time

An 8-round loop that took 6 weeks and lost the top candidate to a 3-round competitor. The 4-stage rebuild — 60-min screen, paid 4-hour project, 90-min architecture, 45-min cultural — and the offer-acceptance lift.

engineering hiringsenior engineer interviewtechnical interviewtake-home projectrecruiting funneloffer acceptance+1

BusinessJun 5, 2026(5 months ago)41 min read

B2B SaaS onboarding to "aha moment" in 7 minutes: the patterns that measurably activate

A signup that took 14 fields, 3 emails, and 22 minutes to first value. The teardown, the rebuild to 7 minutes, the activation lift of 38 %, and the patterns that actually moved the needle.

SaaS onboardingactivation rateaha momenttime to valueproduct-led growthB2B onboarding+1

RevitJun 5, 2026(5 months ago)44 min read

Revit central file corruption recovery: when worksharing breaks at 4 p.m. Friday

A central file that throws "Cannot open" at 16:12 on a Friday with 22 modellers about to clock off. The local-to-central extraction, audit-recover-detach sequence, and prevention playbook.

Revit central fileRevit corruptionworksharing recoveryaudit detachcentral file rebuildRevit backup+1

CoordinationJun 5, 2026(5 months ago)35 min read

Digital twins for O&M: COBie vs IFC vs vendor platforms — what actually survives PC2

A 1.4 GB COBie spreadsheet that the FM team opened twice in five years. An IFC-backed twin that the controls vendor refused to read. The handover patterns that produce a twin operators actually use.

digital twinCOBie handoverIFC for FMasset information modelIWMS integrationBIM to CAFM+1

CoordinationJun 5, 2026(5 months ago)35 min read

4D BIM scheduling in 2026: Synchro vs Navisworks Timeliner vs Bexel Manager honest review

A 28-month tower project. Three 4D platforms evaluated across schedule import, animation fidelity, clash linkage, and what the client actually sees. The decision matrix with measured friction at each step.

4D BIMSynchro ProNavisworks TimelinerBexel Managerconstruction schedulingP6 BIM integration+1

CoordinationJun 5, 2026(5 months ago)42 min read

Autodesk Construction Cloud migration playbook 2026: from BIM 360 to ACC unified

A 400-user practice mid-migration when BIM 360 Docs lost write access during sprint week. The phased migration, permission-mapping, and Bridge-rollback playbook for surviving ACC unification.

Autodesk Construction CloudACC migrationBIM 360 to ACCACC BridgeCDE migrationBIM 360 Docs+1

TechJun 5, 2026(5 months ago)33 min read

Server-Sent Events vs WebSockets in 2026: when SSE wins, backpressure, reconnect semantics

A streaming LLM endpoint that worked on Chrome failed silently on Safari at 30 KB/s. The SSE vs WebSocket decision and the backpressure, reconnect, and heartbeat patterns that survive production.

Server-Sent EventsSSE vs WebSocketstreaming LLMbackpressureEventSource reconnectrealtime patterns+1

TechJun 5, 2026(5 months ago)39 min read

Webhook signature verification done right: HMAC, timing-safe compare, and replay defense

A webhook endpoint validated the signature with `===` and got owned by a side-channel attack three months later. The HMAC, timing-safe, and replay-window patterns that actually work.

webhook signatureHMAC verificationtiming-safe comparewebhook replay attackcrypto.timingSafeEqualwebhook security

TechJun 5, 2026(5 months ago)39 min read

Postgres connection pooling at scale + serverless cold starts: pgbouncer, Supavisor, RDS Proxy

A serverless API that opened 4,200 idle Postgres connections during a Black-Friday burst. The pool-mode, prepared-statement, and transaction-scope choices that survive serverless.

pgbouncerSupavisorRDS ProxyPostgres connection poolserverless Postgrestransaction pooling+1