iOS App Performance & Crash Reduction Consulting
Your app is crashing, slow to launch, or draining battery. I profile with Instruments, find the root cause, and ship the fix. The deliverable is a faster, more stable app — not a slide deck.
- Instruments profiling: Time Profiler, Allocations, Leaks, Network, Energy Log
- crash triage and symbolication from Xcode Organizer and TestFlight reports
- launch time reduction and main-thread stall elimination
- memory and battery optimization for long-running and background apps
What clients say
"Vadim was instrumental to the success Epsy enjoyed on iOS, taking it from an idea on a Miro board to the highest rated and most downloaded app of its kind on the store."
James C. · Mobile Engineering Lead, Epsy
"We had a strict deadline, and Vadim managed to complete the job in time. He gave us meaningful feedback and suggested better approaches, not trying to blindly stick to our specification."
Founder · Pre-seed streaming service
"I can say with confidence that it will be difficult to find a better developer. Vadim is achievement-oriented, highly organized, with very good communication skills."
Alex Z. · Co-Founder, eda.so
Related work
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Health companion app for epilepsy patients.
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Some LLDB and Instruments magic to help everyone debug like a real pro. Second edition!
Common engagements
Performance audit
3-5 days. I profile the app on real devices, identify the top bottlenecks, and deliver a prioritised list of fixes with expected impact. You can ship the fixes yourself or bring me back to do it.
Crash reduction sprint
1-3 weeks. I triage crash reports from Xcode Organizer or your crash reporter, reproduce on device, fix, and verify. Goal is measurable crash-free rate improvement.
Launch time optimization
Cold launch over 2 seconds loses users. I trace the launch sequence, find what's blocking the main thread, and bring it under budget.
Pricing
Architecture reviews, hiring help, second opinions on that thing that's been bugging you.
Features, MVPs, migrations, firefighting. Minimum 5 days.
Priority support: review agency code, join architecture calls, catch problems before they ship.
Questions
Can you work with our crash reporter (Sentry, Crashlytics, Datadog)?
Yes. I pull crash data from whatever you use, cross-reference with Xcode Organizer, and reproduce on device. The tool doesn't matter — the methodology is the same.
How do you measure improvement?
Before/after on the same device and scenario. For crashes: crash-free rate from your reporter. For launch: MetricKit or manual traces. For scrolling: frame rate in Instruments. Numbers, not opinions.
Our app is fine on new phones but slow on older ones.
That's the normal case. I test on the oldest device you support and profile there. Fixes that help iPhone SE help everything above it too.
What if the problem is in our backend, not the app?
I'll find out. Network profiling shows whether the app is waiting on slow API responses or doing something expensive with the data once it arrives. If the bottleneck is server-side, I'll hand you the trace data so your backend team can act on it.
Do you need access to our source code?
For a meaningful audit, yes. I can do a surface-level review from Instruments traces alone, but the actionable fixes come from reading the code.
How quickly can you start?
Advisory calls can happen within days. For project work, I typically need 1-2 weeks notice to clear the calendar, though I keep some buffer for urgent firefighting. Check the availability badges above for current openings.
Do you work with early-stage startups?
Yes, from pre-seed to Series C and beyond. For very early teams, the advisory tier often makes more sense than project work: you get architecture guidance without committing to a large engagement before you've validated the product.
What's included in the day rate?
Everything: code, architecture decisions, code review, documentation, async Slack availability during working hours. No surprise add-ons. I bill for time spent working on your project, not for "thinking about it in the shower."
We're in a different timezone. Will that slow things down?
I'm currently in Vancouver (PST), with full overlap for North American teams. For UK and Europe, I'm online by their afternoon. For Gulf or APAC, we'd agree on overlap hours and handle the rest async. I've worked with teams from San Francisco to Dubai.
Areas I cover
Where I've worked CV LinkedIn
App too slow or crashing?
Tell me what you're working on. I reply within 48 hours.
work@drobinin.com