Hire iOS App Developers in 48 Hours.
Stop interviewing. Start shipping. Access senior Swift and SwiftUI engineers who integrate directly into your team, backed by a risk-free trial and zero developer backout guarantee.
- 5-Stage Vetted Talent
- Risk-Free Onboarding
- No Recruitment Fees
- Time-Zone Aligned
Why Agencies Struggle to Hire In-House (And How We Fix It)
The usual story
Traditional Hiring / Freelance Platforms
- Take 6-12 weeks to find someone.
- High risk of developer backout.
- You manage HR, payroll, and retention.
- Skill level is a gamble.
The ZonSource way
ZonSource Agency Model
- Shortlist in 48 hours.
- Zero Developer Backout Guarantee: If our developer leaves, we replace them free.
- We handle retention & payroll: You just manage the work.
- Pre-Vetted Senior Talent: 8+ years average experience in Swift, SwiftUI, and UIKit .
Migration Paths
Expertise Across the Modern iOS Stack
We’ve retired the frameworks keeping your team up at night — and know the safe migration path off each one.
Languages & Frameworks
Architecture
Cloud & Devops
DATABASE
— Why ZonSource
Why founders choose us over other agencies.
Senior Engineering Team
Work directly with experienced developers and architects — not account managers or juniors learning on your dime.
Business-First Development
We don’t blindly build a feature list. We challenge requirements and help prioritize what the MVP actually needs.
Fixed-Scope MVP Options
Clear scope, milestones and deliverables agreed up front. No hourly drift, no surprise invoices.
Long-Term Engineering Partner
We can continue from MVP → V1 → scaling. One team through the whole journey.
Engagement models
Pick how you want to
Train with us.
Three ways to engage — all senior ML engineers, all eval-driven, all measured against the accuracy and cost targets we agree on before the first training run.
Fixed-scope
Data & Eval Audit
Best for teams unsure if fine tuning is worth it yet.
- Data readiness & quality audit
- Baseline eval on your task
- Fine-tune vs RAG vs prompt-engineering recommendation
- Go/no-go report with cost estimate
Highlighted
Fixed-scope
Fine-Tuning Build
Best for a specific model with a clear training goal.
- Fixed scope, fixed price, fixed timeline
- Data curation → training → eval in 6–10 weeks
- 90-day post-deployment support included
- Eval harness & model card documentation
Embedded
Staff augmentation
Plug in vetted ML engineers into your team.
- 48-hour shortlist of senior candidates
- Time-zone aligned, full-stack or specialist
- Replace or extend at any sprint boundary
- Direct lines to your eng manager
FAQ
The CRM development
questions we get most.
Still curious? Book a 30-min call with our CRM delivery lead — straight talk about your pipeline, data and process, no sales rep in sight.
Should we customize an existing CRM or build a custom one?
Most teams are better served by customizing Salesforce, HubSpot or Zoho — it’s faster and cheaper. We recommend a fully custom build only when your process genuinely doesn’t fit any platform’s data model, and we’ll tell you honestly if that’s not your case.
Can you migrate our data from spreadsheets or an old CRM without losing history?
Yes. We run a validated migration process — deduplication, field mapping, and a reconciliation pass — so historical records, notes and deal stages carry over accurately.
How do you integrate our CRM with the rest of our tools?
We connect your CRM to ERP, helpdesk, billing and marketing tools using native connectors, Zapier/Make, or direct API integration — depending on volume and reliability needs.
Do you handle ongoing support after the CRM goes live?
Yes — we stay on for optimization, new automations, and platform upgrades post-launch, which is why 96% of our clients come back for the next phase.
How long does a typical CRM customization project take?
Most single-platform customizations go from brief to working setup in under 2 weeks. Full custom builds or multi-system integrations are scoped into sprints with a fixed timeline agreed upfront.
Build a CRM worth selling with.
Send us your brief — a CRM delivery lead replies within 24 hours with a scoped plan, platform recommendation, and a fixed timeline.
- 30-min call with a CRM delivery lead
- Platform fit assessment (Salesforce / HubSpot / Zoho / Custom)
- Cost & timeline estimate for your scope
- Reference data model diagram (yours to keep)
- Two relevant case studies from your industry
