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Malt Strategy
Mauricio VazquezMV

Mauricio Vazquez

Supermalter

Senior iOS Developer

€300/day
2 projects
Barcelona, ES
8-15 years
iOS
Claude
Opus
LLM

Average response time: 1 hour

About Mauricio

Super Malter 3 iOS developer - trusted for project success
(earned through consistently high client ratings: on-time delivery, product quality, clear communication and repeat business)

————

Senior iOS Developer · 12+ years experience
I build and ship reliable, maintainable iOS apps using Swift & Objective-C, with modern UI and reactive architectures (SwiftUI, RxSwift). I’ve worked on high-scale projects - including for France’s largest online marketplace - delivering features used by millions.

What I do best
• Architect and implement production-ready iOS apps (from greenfield to legacy refactors)
• Pixel-perfect UI with SwiftUI / UIKit (SnaKit or custom solution) and reactive flows using RxSwift
• Robust testing: unit tests, TDD practices and stability improvements
• CI/CD pipelines and release automation (Fastlane, automated builds & tests)
• Performance tuning, codebase modernization, and maintainability-focused refactors

Why hire me
• Proven track record (Malter Level 2) showing repeated client satisfaction and successful deliveries
• Clear communicator who integrates with product, design and backend teams
• Fast ramp-up on existing codebases and pragmatic, production-minded engineering
Press and Media
Publishing
Leisure, Recreation, and Entertainment
E-commerce
Real Estate

  • English

    Native or bilingual

  • Spanish

    Native or bilingual

Can work on-site
Barcelona (up to 50km)

Experience

  • Leboncoin.fr
    iOS engineer @ Leboncoin
    April 2025 - Today (1 year and 2 months)
    Paris, France
    iOS Developer – Ad Tech & Monetization | Leboncoin.fr

    Client: Leboncoin (Advertising Squad)
    Role: Freelance iOS Engineer
    Scope: Ad delivery, monetization features, experimentation

    ⸻

    Key Contributions:
    • Developed and maintained in-app advertising features for iOS, supporting monetization at scale
    • Built A/B tests to optimize ad formats, placements, and performance on iOS
    • Collaborated with backend, data, and product teams to improve ad delivery and user experience
    • Worked on optimizing ad loading, display logic, and conversion tracking
    • Contributed to a high-traffic app serving 28+ million monthly users in France
    iOS Swift SwiftUI
  • Rakuten TV
    Senior iOS Engineer
    December 2022 - February 2025 (2 years and 2 months)
    Barcelona, Spain
    iOS Engineer – Video Streaming & Monetization | Rakuten.tv

    Client: Rakuten.tv
    Role: iOS Engineer
    Scope: App stability, ad delivery, conversion optimization

    ⸻

    Key Contributions:
    • Reduced app crash rate to below 1%, improving overall iOS stability and user retention
    • Integrated and delivered ad rolls (pre-, mid-, post-roll) in movies and series to boost monetization
    • Built A/B tests to improve movie purchase conversions, experimenting with pricing, CTAs, and placement
    • Ran separate A/B tests for subscription flows, optimizing onboarding, and UI
    • Contributed to core app architecture and user experience for a global streaming audience
    iOS Swift Apple TV
  • Woonkly
    Lead iOS Engineer
    January 2022 - December 2022 (11 months)
    Barcelona, Spain
    Designed and built an iOS app from scratch. I followed TDD, CI/CD, SOLID, Clean Architecture. We are using: SwiftUI, Combine, Snapshot Testing, Unit Testing, Github Actions.
Check out Mauricio's experience

Reviews

5,0

Out of 2 ratings

S

Shanshan

Engineering Manager Team Advertising - Leboncoin - Spain sourcing

Several months project

-

Reviewed on 02/02/2026

Mauricio is an experienced iOS developer with good technical skills, while working on framework refactoring, he showed a clear and well-structured understanding of the work, which made it easy to move forward. From May 2025, he started working on more product feature development. He delivers reliable work, communicates clearly, and collaborates well with others, especially with AdTech and QA. Over time, he became more autonomous and proactive. He communicates early, creates tickets when needed, and can manage his tasks with limited supervision. When issues appear, he takes responsibility and focuses on fixing them quickly. Overall, his contribution and attitude have been very positive. Based on this, we decided to renew his contract for an additional 6 months at the beginning of 2026. On a personal level, he is curious, motivated, and continues to integrate well into the team and our daily work.
S

Shanshan

Leboncoin - Spain sourcing

Less than 1 year project

-

Reviewed on 12/11/2025

Mauricio is an experienced iOS developer. From the very beginning, he made great efforts to understand the project and integrate into the team. He learns quickly, adapts easily to new development environments, and communicates effectively. His autonomy and proactive attitude have brought significant value to our project

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Education

  • Bachelor of Science
    University of Arkansas at Fayetteville
    Bachelor of Science - BS
  • Associate of Science in Programming
    Northwest Arkansas Community College
    Associate of Science - AS

Skill set

Swift
SwiftUI
Objective-C
RxSwift
Git
Clean Architecture
Mobile App Deployment

Categories