Flutter Lead (Relocation to Madrid)

First 3 months of probation period you will work remotely and after you need to relocate to Madrid and work onsite in office every day. 

Client provide local relocation support. 

We are looking for an experienced Senior / Lead Flutter Engineer to lead the architecture, design, and development of advanced mobile applications for iOS and Android. This role combines hands-on engineering with technical leadership, ownership of mobile architecture, security best practices, and mentorship of the development team. You will work closely with product, design, and backend teams to deliver secure, scalable, and high-performance mobile solutions in a complex, real-time, and compliance-driven environment. 

Details

Employment Type: Full-time

Work Format: Onsite in Madrid office

English Level: Fluent
Start: ASAP
Relocation in 3 months; Client provide relocation support

Key Responsibilities

Lead the architecture, design, and development of Flutter applications for iOS and Android

Build and maintain secure and scalable authentication systems, including:

• OAuth2 / OpenID Connect
• PKCE flows
• Multi-factor authentication (MFA)
• Secure token lifecycle management
• Role- and permission-based access control

Integrate external APIs, real-time data pipelines, payment systems, and compliance-related services

Establish and enforce mobile security best practices:

• Certificate pinning
• Secure local storage
• Encryption strategies
• Secure session management

Collaborate with product managers, designers, and backend engineers to plan and deliver high-impact features

Perform advanced debugging, performance tuning, and code optimization

Review code and enforce engineering standards and modern Flutter architectures (Bloc, Riverpod, Clean Architecture)

Oversee release processes and ensure stable deployments to the App Store and Google Play

Evaluate and introduce new tools, frameworks, and technologies to improve development efficiency

Mentor junior and mid-level engineers and provide technical leadership and guidance

Required Qualifications

Bachelor’s degree in Computer Science, Software Engineering, or equivalent practical experience

5–7+ years of mobile development experience

3+ years of hands-on Flutter experience

Proven experience building production-grade mobile applications in regulated or security-sensitive domains

Strong expertise in authentication, authorization, and identity management solutions

Solid understanding of:

• Clean Architecture and SOLID principles
• State management (Bloc, Riverpod, or similar)
• REST and GraphQL API integrations

Experience with mobile CI/CD pipelines (e.g., Codemagic, GitHub Actions, Bitrise)

Strong understanding of secure coding practices and compliance requirements

Familiarity with backend concepts such as microservices and containerized environments

Strong leadership, decision-making, and problem-solving skills

Ability to work independently and drive solutions end-to-end

Nice to Have

Experience with payment integrations and financial APIs

Knowledge of cloud platforms (AWS, GCP, Firebase)

Experience with real-time systems (WebSockets, webhooks, event-driven architectures)

Experience with monitoring, analytics, and experimentation frameworks

Previous tech lead or team lead experience