11/18/2025 updated

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Senior Frontend Engineer

Schiedam, Netherlands
Netherlands
Computer Science / Analysis and development of systems
Schiedam, Netherlands
Netherlands
Computer Science / Analysis and development of systems

Profile attachments

Renato Ferreira - resume.pdf

InnovationJavaScriptAgile MethodologyNode.jsTypeScriptReact.jsCoaching and MentoringTeam ManagementFront End Software DevelopmentRestful Api
Full-stack Engineer and Team Lead with 10+ years of experience in building and scaling applications using JavaScript, TypeScript, Node.js, and RESTful APIs. Proven track record of leading cross-functional teams in fast-paced environments to deliver high-quality, scalable software. Adept at mentoring engineers, driving innovation, and improving development processes through Agile methodologies. Passionate about creating exceptional user experiences and fostering collaborative, high-performance teams.

Experience

Professional experience10+ years
Freelancer since2019

Languages

EnglishFluentDutchBasic knowledgePortugueseNative speaker

Project history

React Tech Lead

Mercell

Government and Public Services

50-250 team member

Mercell is a leading public tendering and bidding platform serving European buyers and suppliers. As a React Tech Lead at Mercell, I drive technical innovation while overseeing the development and maintenance of scalable, high-performance web applications. Working within a multicultural, Agile team, I balance hands-on coding with leadership responsibilities to ensure the team delivers high-quality products that meet business goals.
 
  • Leading technical execution and collaborating with group architects to establish a consistent, scalable, and maintainable codebase, ensuring alignment with business objectives and long-term technical vision.
  • Spearheading the migration of legacy features into the core Mercell platform, improving system stability and performance while reducing technical debt.
  • Designing, implementing, and maintaining micro-front end architectures, ensuring modularity and scalability across the platform.
  • Enhancing UI/UX to align with design guidelines, improving the user experience and overall usability of our applications.
  • Mentoring junior developers, conducting code reviews, and fostering a culture of technical excellence and knowledge sharing.
  • Supporting cross-team collaboration to ensure dependencies and integration points are smoothly managed, enabling the team to meet deadlines and technical milestones.

Senior Frontend Engineer

Success Factory / MKX

Marketing, PR and design

50-250 team member

Success Factory is a network marketing company based in Amsterdam, specializing in web and mobile applications. As a Senior Frontend Engineer, I led a dynamic Scrum team in designing, developing, and maintaining innovative products built with React, React Native, Next.js, Node.js, TypeScript, and other cutting-edge technologies. In this role, I balanced hands-on technical contributions with leadership responsibilities, helping drive the team’s success while ensuring scalability and performance of the applications.

Key Responsibilities:
  • Lead the development and deployment of high-quality web and mobile applications, overseeing the full software development lifecycle from architecture to delivery.
  • Architect scalable solutions and define project infrastructure, ensuring that technical choices align with long-term goals and support a growing user base.
  • Provide mentorship to mid and junior developers, conducting code reviews and guiding them through technical challenges to elevate the overall team's capabilities.
  • Organize workshops and technical sessions to promote knowledge sharing, innovation, and continuous learning within the team.
  • Foster a collaborative work environment by partnering with Backend engineers, QA, Product Managers, and Designers to deliver seamless and well-integrated user experiences.
  • Lead recruitment efforts by interviewing and hiring new developers to expand the team, ensuring cultural and technical alignment.
  • Maintain and extend legacy projects, ensuring ongoing improvement and integration of new features without compromising system stability.

Senior Web3 Frontend Engineer

Fujitsu

Government and Public Services

>10.000 team member

At Fujitsu, I collaborate with a talented, global team of engineers to design and build cutting-edge blockchain applications for clients worldwide. My role as a Senior Full-Stack Engineer primarily focused on developing responsive, high-performance platforms using Node.js, Next.js, React, TypeScript, GraphQL, and a microservice-based architecture. In this fast-paced environment, I combined hands-on development with team leadership to deliver scalable and secure solutions.
Key Responsibilities:
  • Lead the development and delivery of scalable, high-performance blockchain applications, ensuring technical excellence and alignment with client requirements.
  • Translate client specifications into clear, actionable tasks, working closely with product managers and clients to define and prioritize project goals.
  • Mentor and guide junior developers, providing technical leadership through code reviews, architectural guidance, and hands-on support to ensure best practices and high-quality deliverables.
  • Collaborate cross-functionally with backend teams, product managers, and designers to integrate complex systems and deliver seamless user experiences.
  • Facilitate agile processes, including running daily Scrum meetings, sprint planning, and retrospectives, to ensure that the team meets objectives and continuously improves.
  • Help shape the architecture and scalability of the application, contributing to the design of a micro-frontend architecture and microservices that enable easy scalability and maintainability.
  • Ensure the use of best practices in development, testing, and deployment, driving a culture of quality and technical excellence across the team.

CoFounder & Full-Stack JavaScript Developer

QARWASH.COM

Government and Public Services

< 10 team member

At Qarwash, I played a key role in the full-stack development of a mobile platform connecting car wash businesses with customers, leading technical initiatives, and collaborating across functions to ensure high-quality, scalable solutions.
Key Achievements:
  • Led the development and deployment of a mobile app using React Native, optimizing the user experience for both iOS and Android platforms, ensuring responsive design and smooth functionality.
  • Architected and developed a backend API using Node.js and GraphQL with TypeScript, enabling efficient data fetching and enhanced performance across the platform.
  • Designed and maintained a PostgreSQL database, structuring complex data models to ensure scalability and seamless integration with the app and website.
  • Set up cloud infrastructure on DigitalOcean, utilizing Docker for containerization, and streamlined application deployment, ensuring consistent environments across development, staging, and production.
  • Led the development of the main company website using Gatsby.js, improving performance and enhancing the user interface.
  • Collaborated closely with product and design teams to align on user experience, ensuring the application met customer needs while optimizing technical processes.

Senior Frontend Engineer

SOConnect
As a Senior Frontend Engineer at SoConnect, I collaborated closely with a small, high-performing team to help businesses integrate their services and manage customer feedback across multiple platforms. My role was focused on delivering scalable, user-centric solutions, leading frontend development efforts, and driving key product initiatives.
Key Achievements:
  • Developed and maintained a comprehensive product management interface that allowed clients to easily manage their subscriptions, improving the user experience and increasing engagement with the platform.
  • Collaborated closely with cross-functional teams including product owners, UX/UI designers, and marketing to align frontend development with business goals, ensuring that design decisions were effectively implemented in the product.
  • Mentored junior developers, providing technical guidance and support to foster their growth and ensure successful integration of new features.
  • Improved testing coverage across the platform using React Testing Library, ensuring that the codebase remained robust and bug-free as the product scaled.
  • Enhanced team productivity by actively contributing to the improvement of Scrum practices, optimizing sprint planning and retrospectives to streamline workflows.
  • Managed and deployed the application using Amazon Amplify, ensuring smooth deployment processes and efficient scaling of the platform.

Frontend Engineer

VONQ

Marketing, PR and design

50-250 team member

At VONQ, I contributed to the development and maintenance of a cutting-edge recruitment platform that helped companies create centralized job campaigns and optimize their recruitment marketing efforts. As part of an agile, cross-functional team, my role focused on enhancing the platform’s frontend, ensuring a seamless user experience, and integrating new features that aligned with business goals.
Key Achievements:
  • Maintained and enhanced the Job Market Platform built with React and Redux, adding new functionalities to improve recruiter workflows and increase platform usability.
  • Collaborated with the Marketing team to ensure a cohesive user experience across the platform, aligning technical decisions with marketing strategies and business objectives.
  • Integrated new technologies and tools to streamline development processes and improve platform performance, ensuring scalability and maintainability.
  • Worked closely with the backend team to integrate PHP-based APIs (using the Symfony framework) into the frontend, ensuring smooth data flow and efficient handling of user interactions.
  • Developed and maintained high-quality frontend code using HTML5, CSS3, and ES6+, adhering to best practices and ensuring compatibility across various devices and browsers.
  • Led the implementation of unit and integration tests using Jest, improving code reliability and enhancing team productivity through automated testing.
  • Actively participated in SCRUM ceremonies, including sprint planning, stand-ups, and retrospectives, contributing to the continuous improvement of development processes.

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