“DJ is phenomenal. They find amazing candidates, make hiring extraordinary devs easy. Think of it as having a top recruiter, HR, and payroll departments in dozens of countries.”
Looking for the best Core Data developers? DistantJob headhunts senior iOS engineers who are genuinely experts in Core Data, not developers who list it on a resume because they once used NSManagedObject. We find professionals with real production experience in data model migrations, CloudKit sync, concurrency, and the modern SwiftData transition
Andres
Recruitment Expert
Verified
Competent entity modelling with well-considered relationships and fetch indexes. Versioned migrations using both lightweight (inferred mapping) and heavyweight (custom NSMigrationPolicy) paths. NSPersistentHistoryTracking for auditing and cross-process sync. Candidates should have managed at least one multi-version migration in a shipped application without data loss incidents.
Batch inserts and updates using NSBatchInsertRequest and NSBatchUpdateRequest. Prefetching relationship data to reduce faulting overhead. Instruments profiling with the Core Data template to identify fetch performance bottlenecks. Understanding of how persistent store coordinator configuration affects read/write throughput on large datasets.
NSPersistentCloudKitContainer setup including entitlement configuration and container assignment. Conflict resolution strategies for concurrent edits across devices. Background push notification handling for silent sync triggers. Understanding of the differences between public, private, and shared CloudKit database zones and their Core Data implications.
NSPersistentContainer with main and background context patterns. Correct use of perform() and performAndWait() to prevent context threading violations. Combine publisher integration with NSFetchedResultsController for reactive UI updates. Child context patterns for transactional editing with discard support.
@FetchRequest and @SectionedFetchRequest property wrappers in SwiftUI views. Observable object patterns with NSFetchedResultsController delegate. SwiftData @Model and @Query macros alongside Core Data for incremental adoption. Understanding of how the @ModelContainer configuration bridges both frameworks in iOS 17+ apps.
Incremental NSManagedObject subclass rewrites preserving existing migration history. Bridging header management for mixed-language targets. Test suite maintenance through the migration — ensuring unit test parity before and after each conversion increment. Candidate should have managed at least one real Objective-C Core Data codebase migration.
What our clients get when they hire through DistantJob.
You'll interview pre-screened React Hooks developers within 14 days. No job boards, no sorting through hundreds of resumes — just 3-5 candidates who already passed our technical bar.
Unlike Upwork or Toptal, your React Hooks developer works full-time and exclusively on your product. They join your standups, learn your codebase, and ship like a local team member.
Senior React Hooks developers from regions with lower cost of living, earning above their local market rate — while you save up to 40% compared to U.S. hiring.
Contracts, payroll, taxes, benefits, and compliance in your developer's country — all handled. You manage the work, we manage everything else.
Every React Hooks developer passes our 4-stage vetting protocol — technical deep-dives led by senior engineers, not checkbox assessments. Only the top 1% reach your interview.
If the hire isn't the right fit, we replace them at no extra cost. Your investment is protected from day one.
Testimonials
“DJ is phenomenal. They find amazing candidates, make hiring extraordinary devs easy. Think of it as having a top recruiter, HR, and payroll departments in dozens of countries.”
“DistantJob took the time to talk about the job description and explore what was important to us. They came back with a great candidate on the first try!”
“I can easily say that I’ve never worked with a more dedicated, patient, and productive developer. DistantJob made the remote engagement painless. Win-win!”
“We have 3 employees from DistantJob right now. Phenomenal. For the dollar value that we are spending, we are far ahead of what we would find locally or offshore.”
“Hiring through DistantJob (…) surpassed my expectations. I had no opinion before, neither for [remote work] or against, but this experience definitely put it on the radar for me.”
“DistantJob is great for helping you find technical folks especially when your local area doesn’t have the right pool of talent for the job.”
“The remote developers presented by DistantJob] delivered a caliber of quality, skill and technical expertise, beyond my best expectations, far exceeding our local team members.”
“Working with DistantJob made everything about recruiting a highly technical employee easier and cost-effective.”
As a leading remote IT recruitment agency, we care that our clients take part throughout the hiring process. Why? Because for us, hiring a qualified candidate is not only about the skills and abilities, but it’s also about how candidates match with your company’s culture.
As soon as you talk with us or fill our form, the first thing we do is analyze your company. We want to understand your culture and the type of people you value working with.
In 2 weeks, you’ll start reviewing people that match your requirements. We focus on providing you 3-5 top candidates instead of giving you an endless list.
Once you select the candidate, we handle all the contracts, NDA’s and payments from day 1.
We proactively source across global markets and triage applicants based on their expertise, salary band, U.S. time-zone overlap, English fluency, and long-term availability.
A recruiter assesses English proficiency, async communication, culture add, motivation, and availability. We verify work history and stability (no serial short stints).
Practical task (90–120 min): expert-led technical screen (conducted by a senior iOS developer, not a generalist recruiter)
Senior engineers run a live session to walk through design trade-offs, testing approach, and deployment basics.
We speak with past stakeholders and review code artifacts where possible. We confirm achievements, ownership level, and reliability in distributed teams.
We align on start date, hardware/security constraints, preferred collaboration tools, and, when needed, relocation logistics inside the US.
| DistantJob | Job boards / general agencies | Freelance platforms | |
|---|---|---|---|
| Developer type | Full-time, exclusive to your company | Mixed; often shared or contract | Freelance, juggling multiple clients |
| Core Data vetting | Technical screen by senior iOS developer | Keyword matching / no tech vetting | Self-reported skills, no verification |
| SwiftData expertise | Specifically assessed | Not tested | Self-reported |
| Time to first shortlist | 7–10 business days | 4–8 weeks | 24–72 hours (unvetted) |
| EOR / compliance | Included — we are the legal employer | Not included | Not applicable |
| Retention | 90%+ at 12 months | Industry avg ~60% | Project-to-project |
| Cost vs. US rates | 40–55% lower | Comparable or higher | Variable, no floor |
These are the questions DistantJob’s technical interviewers use to separate genuine Core Data expertise from surface familiarity. They are useful whether you are interviewing a DistantJob candidate or conducting your own search.
What to listen for: Understanding that lightweight migration handles additive changes if the attribute has a default value. Awareness that heavyweight migration is needed for complex transformations. Mention of testing the migration against a copy of production data before shipping.
What to listen for: NSManagedObjectContext is not thread-safe — main queue context is for UI operations, private queue context for background work. Use of perform() or performAndWait() to dispatch work to the correct queue. Common mistake: passing NSManagedObject instances between contexts directly instead of passing ObjectIDs.
What to listen for: NSPersistentCloudKitContainer configuration, including entitlements and container identifier. Understanding that CloudKit uses a last-write-wins policy by default and how to implement custom merge policies. Awareness of the difference between public and private CloudKit databases for this use case.
What to listen for: Use of Instruments with the Core Data template to identify fetch time and faulting overhead. Consideration of NSFetchRequest configuration: fetch limit, fetch batch size, relationship prefetching, and appropriate use of NSFetchResultsType. Batch fetching vs. full materialisation.
What to listen for: Understanding that SwiftData in iOS 17 uses the same underlying SQLite store as Core Data and they can coexist. The migration path involves adding @Model types alongside existing NSManagedObject subclasses. Configuration of ModelContainer to share the store URL with the existing Core Data persistent store coordinator. Awareness that a full migration is optional — hybrid use is a valid long-term architecture.
No. We place full-time remote employees who work in your repos and rituals.
From the discovery call, we typically present a shortlist of 3–5 vetted candidates within 7–10 business days. 80% of clients make a hire from that first batch, which means most searches are complete within two weeks. The full four-stage vetting process runs in parallel with sourcing, so candidates you see have already been technically screened by a senior iOS developer.
We primarily place mid-level and senior engineers — developers with 3 or more years of production iOS experience, including real Core Data work in shipped applications. We do not place juniors or bootcamp graduates. The passive candidate sourcing model (finding people who are already employed and performing well) naturally skews toward established professionals.
Yes: global contracts, NDA, payroll, benefits, and compliance are included.
You’re covered by our money-back and replacement guarantees.
When you partner with DistantJob for your next hire, you get the highest quality developers who will deliver expert work on time. We headhunt developers globally; that means you can expect candidates within two weeks or less and at a great value.
Increase your development output within the next 30 days without sacrificing quality.
