Senior IOS Engineer - Contractual

About us: Working at Tech Holding isn't just a job, it's an opportunity to be a part of something bigger. We are a full-service consulting firm that was founded on the premise of delivering predictable outcomes and high-quality solutions to our clients.  Our founders and team members have industry experience and have held senior positions in a wide variety of companies – from emerging startups to large Fortune 50 firms – and we have taken our combined experiences and developed a unique approach that is supported by the principles of deep expertise, integrity, transparency, and dependability. Responsibilities Critical thinker who can anticipate potential pitfalls and suggest improvements, especially around data correctness (timezone, currency, channel-specific filters) and on-device analytics performance. Contribute to the codebase, and ensure that the acceptance criteria have been verified before sending the ticket to QA. Build new features from the ground up — KPI dashboards, drill-down views, filter panels, period comparisons, and data-visualization screens — while collaborating closely with product, design, and engineering teams. Collaborate with onsite and remote engineering teams to produce clean reusable SwiftUI / MVVM code, and provide constructive criticism through code reviews. Work with the team lead and the Product team and turn Product requirements into actionable technical stories with well-defined technical specifications and details. Work with backend, data, and analytics engineers to discuss Parquet schemas, Firebase Storage sync flows, and SQL / DuckDB query requirements needed to power the iOS app. Maintain and enhance the existing code by fixing bugs and monitoring app performance using Instruments (Time Profiler, Allocations, Leaks). Implement and improve offline-first sync — Parquet download from Firebase Storage, local caching, and DuckDB import. Provide feedback on architecture design and decisions on how to scale mobile applications as data volume and feature surface grow. Provide concise documentation that other mobile developers can easily understand. Own App Store releases — code signing, provisioning, TestFlight, and App Store Connect submissions. Requirements 5+ years of iOS development experience, including a strong familiarity with Apple frameworks and object-oriented (and protocol-oriented) design best practices. A self-starter and fast learner who can adapt to the latest industry trends and technologies. Strong experience building applications in Swift (Swift 5.8+), including Swift Concurrency (async/await, actors, @MainActor). Hands-on experience with SwiftUI (iOS 17.6+) — state management (@State, @StateObject, @ObservedObject, @EnvironmentObject, @Binding), navigation, view composition, and custom layouts. Solid grasp of MVVM architecture and clean separation of Models / ViewModels / Views / Services. Hands-on integration experience with Firebase — Authentication, Firestore, Storage, and Analytics. Experience implementing Sign in with Apple and Google Sign-In flows. Comfortable working with SQL and embedded / local databases (DuckDB, SQLite, Core Data, or Realm — DuckDB / Parquet exposure is a strong plus). Experience with Combine or async-await based reactive data flow. Familiar with Swift Package Manager for dependency management. Proficient with Xcode 16+, debugging with LLDB, and performance profiling with Instruments. Knowledge of building and testing large-scale, data-heavy iOS apps and codebases (BI dashboards, analytics, or reporting apps) is a strong bonus. Exposure to offline-first sync patterns, file I/O, and local data caching. React Native or Flutter, Swift Charts, or Fastlane / Xcode Cloud / GitHub Actions CI/CD pipelines is a bonus. Experience working with a distributed remote team. Be punctual and provide accurate task/project estimations. Comfortable working in an agile and fast-paced environment. Have a good understanding of using git and the gitflow workflow for source control management and versioning. Tech Holding is proud to be an Equal Opportunity Employer and is committed to fostering a diverse and inclusive workplace. We welcome applicants from all backgrounds and experiences, and we consider qualified applicants without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, disability, veteran status, or any other legally protected characteristic. If you require accommodation in the application process, please contact our HR