Mobile Application Developer

React Native Mobile Developer

Location : Helena, Montana (Onsite)

Employment Type : Contract (Full-Time Hours)

Role Overview

We are seeking a contract React Native Mobile Developer to enhance and maintain cross-platform mobile applications for iOS and Android. The developer will be responsible for delivering robust, performant features with offline capabilities using local storage and enterprise-grade data integrations. The position reports to the Mobile Apps Manager and collaborates with both UX and back-end service teams. The ideal candidate brings deep object-oriented programming experience, strong knowledge of Java and JSON-based RESTful APIs, and a solid background working with relational databases such as Oracle and PostgreSQL.

Employee Value Proposition (EVP)

Purpose

This role supports the continuous improvement of mobile platforms that serve critical user workflows across field and customer operations. Your work will directly enhance user satisfaction and app reliability in both connected and offline environments.

Growth

You will work at the intersection of UX, cloud APIs, and cross-platform app development, gaining valuable experience with complex systems integration, user-centered design, and advanced debugging tools. You'll be part of a high-velocity Agile team solving meaningful mobile challenges.

Motivators

If you enjoy creating elegant, high-performance mobile experiences, solving deep offline-first design problems, and working in an environment that values autonomy and technical skill, this role offers a rewarding professional challenge and opportunity to make an immediate impact.

Major Performance Objectives

• Launch Cross-Platform React Native App Enhancements (90–120 Days)

Within the first 3–4 months, take ownership of enhancing the existing React Native application across both iOS and Android. This includes building new features, refining offline storage mechanisms, and optimizing performance. Deliver measurable improvements in crash rate, responsiveness, and user-reported issues.

Collaborate with API and back-end teams to build or update JSON-based REST endpoints used by the mobile app. Within the first 90 days, successfully complete at least two complex API integrations, with clear metrics showing performance and reliability improvements.

Within the first 6 months, design and implement offline-first experiences using local storage, with automatic sync-on-reconnect functionality. Deliver workflows that are reliable even in poor connectivity conditions. Success is measured by user feedback and reduced issue tickets.

Critical Subtasks

From day one, actively participate in Agile / Kanban standups, sprint planning, retrospectives, and demos. Maintain work items in GitLab and ensure transparent reporting on blockers, estimates, and deliverables.

Within the first 3 months, identify legacy Java components and migrate them to maintainable, performant React Native equivalents. Document code transitions and performance gains where applicable.

Work with backend developers to define and test mobile-optimized RESTful services. Ensure proper JSON formatting, error handling, and retry mechanisms suitable for mobile constraints.

Work closely with the UX team to implement designs in accordance with platform guidelines. Create smooth transitions, animations, and layouts that work across devices and screen sizes.

Develop mobile-side persistence strategies that integrate with relational databases like Oracle and PostgreSQL. Ensure reliable syncing, conflict handling, and rollback capabilities where needed.

Consistently use GitLab for version control, merge requests, and CI / CD deployment processes. Develop and debug code using IntelliJ and related toolchains. Assist in resolving production issues as needed.

Within the first 90–180 days, take ownership of identifying how AI and automation tools can support or enhance the core responsibilities of this role. Evaluate tasks that could be streamlined or improved, lead pilots, and embed continuous AI adoption into daily work.

CoSourcing Partners is an equal opportunity employer committed to fostering an inclusive and diverse workplace. We do not discriminate based on race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, genetic information, or any other protected status under applicable federal, state, or local laws.

We believe in creating a work environment where all employees feel valued, respected, and empowered to contribute to our success. Accommodations are available upon request for applicants with disabilities throughout the hiring process.

Join us and be part of a team that values diversity, equity, and inclusion.