Senior Back-End Developer

A Senior Back-End Developer at Blockchain.com is responsible for designing, developing, and maintaining scalable backend services using Kotlin and Java. The role also involves building and optimizing APIs, managing databases for large-scale data processing, implementing CI/CD pipelines for efficient deployments, and mentoring junior developers, all while collaborating with cross-functional teams to deliver secure and user-centric solutions.

To be successful as a Senior Back-End Developer at Blockchain.com, candidates should possess proficiency in Java or Kotlin along with strong knowledge of microservices architecture, API design, and database systems like PostgreSQL and MySQL. Familiarity with Docker, CI/CD tools, and event-driven architectures is also valuable. Additionally, strong problem-solving skills, attention to detail, and a commitment to code quality are crucial for this role.

While experience with blockchain technologies is not mandatory for the Senior Back-End Developer position at Blockchain.com, it is considered a nice-to-have. Candidates with knowledge of financial systems or related fields will find their skills beneficial, especially as they work on financial and crypto-native products.

The culture at Blockchain.com emphasizes collaboration, mentoring, and continuous improvement. As a Senior Back-End Developer, you will lead technical discussions, advocate for best engineering practices, and mentor junior developers, fostering an inclusive environment where team members can thrive and learn from one another.

Blockchain.com offers competitive salaries based on experience, meaningful equity in the company, and a flexible work environment with a 'work from anywhere' policy. Additional perks include unlimited vacation, performance-based bonuses, and state-of-the-art Apple equipment provided for your work.

When answering this question, highlight your understanding of microservices as a software design technique that structures an application as a collection of loosely coupled services. Discuss how applying microservices allows for scalable applications and helps in deploying independent services, facilitating easier updates and maintenance.

To address this question, mention techniques such as profiling the application to identify bottlenecks, optimizing database queries, implementing caching mechanisms, and conducting load testing to ensure performance sustainability under varying loads.

Discuss common practices such as implementing OAuth for authentication, using SSL/TLS to encrypt data in transit, input validation, rate limiting, and adhering to RESTful API design principles to enhance overall security.

In your response, elaborate on how you have set up CI/CD pipelines to automate the integration and deployment of applications. Mention tools you’ve used, the specific processes you implemented, and how it has improved your workflow and reduced deployment times.

When discussing this, choose a specific example from your past experiences that highlights your problem-solving skills. Explain the problem, your analysis, the steps taken to reach a solution, and the positive outcome resulting from your actions.

Talk about how you have used Docker to create isolated environments for the applications you’ve developed, making deployments more straightforward and consistent, as well as how containerization helps in scaling applications effectively.

Highlight your commitment to continuous learning through online courses, attending workshops/conferences, reading industry publications, and participating in developer communities to keep your skills current and relevant.

Discuss your approach to code reviews, which should include a focus on constructive feedback, ensuring code quality standards are met, checking for potential bugs, and encouraging collaborative discussions for improvements.

Explain how you facilitate effective communication and collaboration by utilizing various tools and methodologies such as Agile or Scrum, ensuring regular updates, and also being open to feedback from different departments.

Describe your mentoring philosophy, focusing on how you provide guidance through hands-on coding sessions, sharing best practices, offering constructive feedback, and encouraging an environment of learning and growth.