Principal Mobile Developer

Job Description: Develops and enhances full stack web applications and native mobile applications using Test Driven Development (TDD) and automated testing to ensure stability, resilience, and strong code coverage. Builds native iOS applications using Swift and SwiftUI, and native Android applications using Kotlin and Compose. Designs and implements scalable back-end services, RESTful Application Programming Interface (APIs), and microservices architecture. Executes end-to-end releases with automated Continuous Integration/Continuous Delivery (CI/CD) pipelines using Jenkins and platform specific tooling for web and mobile deployments. Works with architecture, security, and User Experience (UX) design teams to deliver compliant, accessible, and user friendly solutions aligned with Web Content Accessibility Guidelines (WCAG), Apple Human Interface Guidelines, and Material Design. Supports efficient engineering practices, including trunk-based development, feature toggles, and branch by abstraction, using CI/CD and testing tools. Develops back-end systems using cross platform knowledge, API design, and security best practices including OAuth (Open Authorization) and OpenID Connect, and Amazon Web Services (AWS) Elastic Compute Cloud (EC2), Lambda, DynamoDB, and Simple Storage Service (S3). Applies engineering best practices and security standards to ensure quality, maintainability, and compliance.

Primary Responsibilities: Designs, develops, and maintains full-stack features across back-end and native mobile platforms (iOS and Android).Coordinates end-to-end feature development from concept through production deployment, taking ownership of technical decisions across the entire stack. Builds and maintains scalable microservices and RESTful/GraphQL APIs that support web and mobile application functionality. Develops comprehensive documentation for multiple applications or subsystems. Plans and coordinates project schedules and assignments for multiple technology initiatives. Advises on risk assessment and risk management strategies for engineering projects. Provides technology solutions to daily issues and delivers technical evaluation estimates for upcoming initiatives. Mentors junior team members. Contributes to technical roadmap planning and advises senior management on technical strategy. Monitors application performance, troubleshoots issues, and implements optimizations across the technology stack. Researches and evaluates advancements in self-custody crypto wallet encryption to inform design decisions, enhance security controls, and ensure alignment with emerging standards.

Education and Experience: Bachelor's degree in Computer Science, Engineering, Information Technology, Information Systems, or a closely related field (or foreign education equivalent) and five (5) years of experience as a Principal Mobile Developer (or closely related occupation) developing native mobile applications for iOS and Android and integrating them with back-end APIs, within an Agile and DevOps environment. Or, alternatively, Master's degree in Computer Science, Engineering, Information Technology, Information Systems, or a closely related field (or foreign education equivalent) and three (3) years of experience as a Principal Mobile Developer (or closely related occupation) developing native mobile applications for iOS and Android and integrating them with back-end APIs, within an Agile and DevOps environment. Skills and Knowledge: Candidate must also possess:· Demonstrated Expertise designing scalable backend services and microservices architecture using Node.js, NestJS, or GraphQL; and building RESTful or GraphQL APIs with authentication and authorization mechanisms (OAuth and OpenID Connect) that support web or mobile experiences, while ensuring security, performance, and maintainability across distributed systems.· Demonstrated Expertise performing native iOS mobile application development and testing using XCUITest, XCTest, Swift, SwiftUI, Objective-C, UIKit, and reactive programming with Combine, within mobile specific VIPER or MVVM architecture patterns, and in alignment with Apple Human Interface Guidelines and the full App Store application lifecycle and release process.· Demonstrated Expertise performing native Android mobile application development and testing using Espresso, JUnit, Kotlin, Compose, Java, XML layouts, and reactive programming with Coroutines, within Clean Architecture patterns and in an environment that supports the full application lifecycle and release process for the Google Play Store; and creating performant and accessible user experiences aligned with Material Design Guidelines and Google Play guidelines.· Demonstrated Expertise performing technical solutioning, implementation support, and code review activities using backend and mobile development technologies, peer mentorship practices, estimation and requirement-refinement tools, and cross-functional collaboration methods within an Agile environment that includes sprint planning, iterative development cycles, coordination with product managers and stakeholders across multiple business units, and alignment between business requirements and technical execution.

Category: Information Technology

Company overview: At Fidelity, we are passionate about making our financial expertise broadly accessible and effective in helping people live the lives they want. We are a privately held company that places a high degree of value in creating and nurturing a work environment that attracts the best talent and reflects our commitment to our associates. We are proud of our diverse and inclusive workplace where we respect and value our associates for their unique perspectives and experience.

Reasonable accommodations: Fidelity will reasonably accommodate applicants with disabilities who need adjustments to participate in the application or interview process. To initiate a request for an accommodation contact the HR Accommodation Team by sending an email to accommodations@fmr.com, or by calling 800-835-5099, prompt 2, option 3.Equal opportunity employer Fidelity Investments is an equal opportunity employer. We believe that the most effective way to attract, develop, and retain a diverse workforce is to build an enduring culture of inclusion and belonging. Applicant screening At Fidelity, we value honesty, integrity, and the safety of our associates and customers within a heavily regulated industry. Certain roles may require candidates to go through a preliminary credit check during the screening process. Candidates who are presented with a Fidelity offer will need to go through a background investigation and may be asked to provide additional documentation as requested. This investigation includes but is not limited to a criminal, civil litigations and regulatory review, employment, education, and credit review (role dependent). These investigations will account for 7 years or more of history, depending on the role. Where permitted by federal or state law, Fidelity will also conduct a pre-employment drug screen, which will review for the following substances: Amphetamines, THC (marijuana), cocaine, opiates, phencyclidine.