Freelance Senior Back-end Engineer - Wizz

As a Freelance Senior Back-end Engineer at Wizz, your key responsibilities include designing and implementing scalable backend solutions, deploying and maintaining systems to ensure high availability for our social app, and collaborating with team members to enhance the product experience. Your role will involve shaping technical strategies and best practices to keep our back-end infrastructure running smoothly.

To qualify for the Freelance Senior Back-end Engineer position at Wizz, you need at least 5 years of back-end programming experience, proficiency in Node.js, and a strong grasp of building APIs. Being fluent in French is essential, along with experience in cloud services like GCP or AWS. Familiarity with high-traffic systems and a background in the mobile consumer industry will give your application a boost.

In your role as a Freelance Senior Back-end Engineer at Wizz, you will work primarily with Node.js, alongside technologies such as Fastify, Socket.io, and Firebase. Our data storage solutions include MongoDB and Redis, while our infrastructure involves Cloud Run, Cloud Functions, and more. Familiarity with these technologies will be crucial for your success in this role.

Wizz stands out as a unique app due to its focus on social interactions among teens, with a user base of over 3 million monthly active users in the US and UK. This provides you with the opportunity to work on a platform that encourages creativity and goodwill, while also facing the challenges of scaling and maintaining a service geared towards a younger audience.

At Voodoo, we strongly believe in fostering professional growth for our Freelance Senior Back-end Engineers. You will have access to innovative projects, collaborate with seasoned professionals, and be part of a vibrant team culture. Additionally, we encourage tech workshops and continuous learning to ensure you stay on the cutting edge of industry trends.

In your response, emphasize specific projects where you successfully utilized Node.js, highlighting problem-solving scenarios. Discuss your familiarity with its frameworks and libraries, and share how this experience can contribute to the success of Wizz's backend systems.

When answering, be sure to outline the problem clearly, your thought process in diagnosing the issue, and the steps you took to resolve it. Showcasing your analytical skills and approach to troubleshooting will demonstrate your ability to handle similar challenges at Wizz.

Discuss your previous experiences building APIs that ensure reliability and performance. Share specific best practices you adhere to, such as security measures, versioning, and documentation, which will be vital for your role at Wizz.

Make sure to highlight any projects you’ve worked on that involved cloud infrastructure. Discuss specific services you utilized, like Cloud Functions or S3, and your understanding of how they enable scalable and efficient backend solutions, particularly for an app like Wizz.

Share your testing strategies and the tools you use to ensure backend systems are robust and reliable. Discuss your emphasis on automated testing and continuous integration, as these practices will help maintain the high standards expected at Wizz.

Elaborate on your collaborative experiences in previous roles, emphasizing how fruitful communication leads to improved backend solutions. Highlight the importance of cross-functional teamwork, particularly in fast-paced environments like Wizz.

In your answer, explain the security measures you implement, such as authentication protocols, encrypting sensitive data, and regular security audits. Demonstrating a proactive approach to security is essential for the role at Wizz.

Discuss any experience you have with designing and managing distributed systems, including challenges you faced. Highlight how your understanding of this architecture type can assist in enhancing the scalability of Wizz's services.

Provide an example of a situation where you successfully adapted to a new technology under tight deadlines. Share how you managed your learning process and applied it effectively in your projects, which will show your adaptability for Wizz.

Express your enthusiasm for working on a social platform targeted at teens and how it aligns with your passion for mobile applications. Connect your skills and experience to the goals of Wizz, showcasing your eagerness to contribute to its growth.