Mobile Engineer

Ciphertext Solutions; North Carolina; Hybrid; USD 100,000 - 130,000; Full time

Benefits offered by this job

Competitive compensation including performance incentives

Flexible work environment

Opportunity to work on cloud-native architectures

Job summary

Ciphertext Solutions is looking for a Senior Mobile Engineer to lead the development of mobile SDKs for iOS and Android. You will design and maintain production-ready SDKs while collaborating closely with the Product, UX, and Backend teams to ensure compliance and security in a dynamic fintech environment.

The role emphasizes building intuitive APIs and integrating with partner systems, leveraging advanced mobile technologies such as Kotlin Multiplatform and React Native.

Join us for competitive compensation and the opportunity to work on cutting-edge financial technology solutions.

Qualifications

• 5–7 years of professional experience developing mobile software.
• Experience working in fintech, payments, or banking.
• Strong communication skills and a high degree of ownership.

Responsibilities

• Design, develop, and maintain production-grade iOS and Android SDKs.
• Define clear SDK APIs that abstract complex workflows.
• Implement robust automated testing for SDKs.

Skills

Mobile software development for iOS and Android

Kotlin Multiplatform

React Native

APIs design

Collaboration with Product and UX

Education

Bachelor’s degree in computer science, software engineering, or related field

Job description

Ciphertext Solutions, Inc. builds secure, scalable financial technology solutions enabling digital innovation for banks, credit unions, and fintech partners. We operate in a SOC 2 and PCI DSS–compliant, cloud‑native environment and specialize in payments, card issuance, and embedded financial services.

Our mobile SDKs are a core product, enabling partners to embed secure financial capabilities directly into their own mobile applications.

Job Summary

Ciphertext Solutions, Inc. is seeking a Senior Mobile Engineer to design, build, and maintain iOS and Android SDKs and applications used by external partners and customers to embed Ciphertext’s capabilities.

This role is SDK‑first: you will focus on building stable, well‑designed, well‑documented mobile SDKs that are easy to integrate, version, and operate in a wide variety of partner environments. Mobile applications exist primarily as reference implementations, testing surfaces, and validation tools for the SDKs.

You will collaborate closely with Product, UX, and Backend Engineering to shape developer‑friendly APIs while meeting the security, reliability, and compliance expectations of fintech and payments platforms.

Key Responsibilities

Mobile SDK Engineering (Primary Focus)

• Design, develop, and maintain production‑grade iOS and Android SDKs consumed by external partners.
• Define clear, intuitive SDK APIs that abstract complex fintech and payment workflows.
• Own SDK concerns including versioning, backward compatibility, migration paths, and deprecation strategies.
• Build SDKs that integrate cleanly into partner and third‑party mobile codebases with minimal friction.
• Support multiple mobile approaches including Kotlin Multiplatform, React Native, and native implementations where appropriate.

Reference Apps & Platform Validation (Secondary Focus)

• Build and maintain internal and partner‑facing reference mobile applications to demonstrate SDK usage.
• Use apps to validate SDK design decisions, surface integration pain points, and support partner onboarding.
• Ensure SDK behavior is consistent across platforms and real‑world app environments.

Architecture, Quality & Developer Experience

• Lead SDK architecture discussions with an emphasis on reusability, testability, and long‑term maintainability.
• Implement robust automated testing for SDKs (unit, integration, and contract tests).
• Own mobile build, packaging, and release pipelines for SDK distribution.
• Produce high‑quality developer documentation, examples, and integration guides.

Product, UX & Cross‑Functional Collaboration

• Partner with Product and UX to translate product requirements into clean SDK interfaces.
• Collaborate with backend engineers on API contracts, authentication flows, and performance considerations.
• Provide early feedback on product designs from a partner and developer‑experience perspective.
• Support partner integrations by diagnosing SDK issues and improving integration ergonomics.

Security, Compliance & Reliability

• Implement secure mobile SDK patterns appropriate for fintech and payments use cases.
• Ensure SDKs meet expectations for encryption, authentication, secure storage, and data handling.
• Contribute to compliance‑driven development practices aligned with PCI DSS and SOC 2 requirements.

Required Qualifications

• 5–7 years of professional experience developing mobile software for iOS and Android.
• Bachelor’s degree in computer science, software engineering, or related field.
• Experience working in fintech, payments, banking or another regulated environment.
• Demonstrated experience building SDKs, libraries, or frameworks used by external teams or partners.
• Strong proficiency with Kotlin Multiplatform and/or cross‑platform solutions such as React Native.
• Solid understanding of native mobile development (Swift, Kotlin) and mobile platform constraints.
• Experience designing APIs intended for long‑term external consumption.
• Experience collaborating closely with Product and UX teams.
• Strong communication skills and a high degree of ownership.

Preferred Qualifications

• Experience integrating SDKs into partner or third‑party mobile applications.
• Familiarity with mobile payment flows, digital wallets, card issuance, or banking integrations.
• Experience publishing and maintaining SDKs with clear semantic versioning.
• Knowledge of secure mobile storage, biometric authentication, and device security best practices.
• Familiarity with mobile observability, analytics, and crash reporting tools.

Why Join Us?

• Competitive compensation, including performance incentives and a flexible work environment.
• Work on cutting‑edge fintech solutions, solving real‑world banking and payments challenges.
• Opportunity to work on secure, scalable, cloud‑native architectures and modern tech stacks.
• Work with a talented, supportive team driven by a shared commitment to excellence.
• Strong engineering culture focused on code quality, automation, and continuous learning.