SDK Developer

About the Position

We are seeking a Senior SDK Developer to join our payments and financial technology company in Lisbon, Portugal. The team builds and maintains mobile SDKs used by widely adopted payment and banking applications, providing a unified integration layer between mobile apps (iOS, Android, and Huawei ecosystem) and backend/core services.

Responsibilities

• Develop and maintain mobile SDKs used by payment and banking applications;
• Build and evolve the SDK layer that connects Android, iOS, and Huawei applications with backend and core services;
• Integrate C++ components into mobile environments using Kotlin, Swift, Java, and Objective-C;
• Investigate technical issues, identify root causes, and implement reliable fixes;
• Provide technical support for production solutions and incidents;
• Improve the performance, stability, security, and compatibility of the SDKs;
• Develop unit tests and follow the defined architecture, security, and code quality standards;
• Contribute to Scrum ceremonies, technical planning, and effort estimation.

Requirements

• Strong professional experience with C++;
• Knowledge of mobile development and integration using Kotlin and Swift;
• Familiarity with Java and Objective-C;
• Solid understanding of Object-Oriented Programming and Design Patterns;
• Experience developing or integrating SDKs, libraries, or reusable software components;
• Experience integrating applications with REST APIs and backend services;
• Knowledge of Git, unit testing, logging, debugging, and troubleshooting;
• Strong teamwork, communication, ownership, and problem-solving skills.

Nice to Have

• Jira
• Confluence
• Bitbucket
• Jenkins
• CI/CD
• SonarQube

Location and Work Model

• Hybrid (3 days/week in the office, Lisbon)

What We Offer

• A project that matches your skills and ambitions, as well as your preferences for working policies and culture.
• A competitive salary with awesome benefits and opportunities to leverage your knowledge and network to earn additional income.
• An empowering and respectful work culture enriched with social and learning events.
• A People Experience Partner specially assigned to you - your go-to career guide, responsible for supporting your growth, facilitating training, and ensuring your work-life balance at KWAN.

About the Company

At KWAN, we connect IT professionals with projects that match their skills, professional experience, and goals. We offer a career progression program, delivered by in-house specialists - our People Experience Partners - to guide them through our journey with us.

What You Can Expect as a KWANer

• Respect isn’t optional here: You’re trusted to deliver and supported to speak up.
• Dedicated People Experience Partner: Someone accountable for your growth, not your allocation.
• Continuous learning, built in: Learning that keeps pace with the systems you build.
• Recognition that’s visible: Your impact doesn’t go unnoticed. Through our Rocket Points System, we constantly recognize your contributions.
• A culture you can feel: From movie and quiz nights to dinners and our annual summer gathering, we don’t just work together - we build real connections.
• Flexible spaces to work your way: Remote-first, with physical hubs when you want connection.

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