Principal Mobile Developer

Fidelity will not provide immigration sponsorship for this position.

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.

• 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.

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.

• 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.

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Fidelity’s Onsite Working Model

Fidelity is transitioning to a full-time onsite working model through a phased rollout across regions and roles. Currently, some roles and locations require 100% onsite presence, while others require less. Onsite expectations are likely to evolve as the rollout continues. This transition does not apply to fully remote roles.

Information Technology Please be advised that Fidelity’s business is governed by the provisions of the Securities Exchange Act of 1934, the Investment Advisers Act of 1940, the Investment Company Act of 1940, ERISA, numerous state laws governing securities, investment and retirement-related financial activities and the rules and regulations of numerous self-regulatory organizations, including FINRA, among others. Those laws and regulations may restrict Fidelity from hiring and/or associating with individuals with certain Criminal Histories.