Experienced Backend Engineer (Kotlin/Java)

Wiser Technology is a leading software development company. Our team of 600 engineers across Europe excels in web and mobile software development, video streaming, defense, machine learning, automotive, e-commerce, and AI. We leverage top-tier technologies and expertise driven by a passion for innovation to drive progress.

We are looking to hire an experienced Backend Engineer to design, build, and maintain robust and scalable backend systems for the next generation of a fully regulated crypto trading exchange. Your primary focus will be developing high-performance, secure, and reliable server-side solutions using Kotlin, leveraging its seamless integration with the JVM ecosystem.

*Only Bulgarian and Serbian citizens will be considered for this role.

WHAT YOU WILL DO:

• Designing, developing, and maintaining scalable, high-performance backend services and APIs using Kotlin.
• Collaborating with frontend and mobile teams to define API contracts and integration points.
• Identifying and resolving performance bottlenecks in backend systems.
• Ensuring the quality, security, and reliability of backend applications.
• Designing and interacting with databases (SQL/NoSQL) to store and retrieve data efficiently.
• Implementing and maintaining microservices architectures.
• Troubleshooting and debugging production issues.

WHAT YOU WILL NEED:

• Proficiency in Kotlin, OR strong experience in Java development with a proven willingness and ability to quickly learn Kotlin.
• Strong working knowledge of backend architecture and design principles.
• Experience with JVM-based frameworks like Spring Boot or Ktor for building RESTful APIs.
• Solid understanding of relational databases (e.g., PostgreSQL, MySQL) and/or NoSQL databases (e.g., MongoDB, Cassandra).
• Proficiency in code versioning tools such as Git.
• Familiarity with cloud platforms (e.g., AWS, Azure, GCP) and containerization technologies (e.g., Docker, Kubernetes).
• Experience with build automation tools like Gradle or Maven.
• Experience with common distributed system technologies such as RabbitMQ, Azure Storage, and Protobuf.
• Experience with continuous integration and continuous delivery (CI/CD) pipelines.
• Extensive experience in Unit, Integration, and API Testing.
• Understanding of asynchronous programming and concurrency patterns.
• Passion for building robust, scalable, and high-quality backend services.
• Good verbal and written communication skills in English.
• Ability to work as part of a team and collaborate effectively with cross-functional teams.

GOOD TO HAVE:

• Direct experience with Kotlin in a production backend environment.
• Proficiency in various Backend Architecture Design Patterns (e.g., Clean Architecture, DDD).
• Experience with gRPC or other inter-service communication protocols.
• Knowledge of caching mechanisms (e.g., Redis, Memcached).
• Experience with monitoring and logging tools (e.g., Prometheus, Grafana, ELK stack).
• Familiarity with security best practices in backend development.
• Understanding of reactive programming concepts (e.g., Kotlin Coroutines, Project Reactor).
• We value versatile engineers; experience in diverse backend ecosystems, particularly with Nest.js, the .NET framework, and/or Golang, will be a significant asset.

Soft Skills & Attributes:

• Fluent in English.
• Ability to understand the requirements and provide design solutions based on the system’s overall architecture.
• Good understanding of quality expectations.
• Ability to work independently and collaboratively in a team environment.
• Practical communication skills to interact with stakeholders and other teams.
• Support, coach, and share knowledge with other team members.

WHAT’S IN IT FOR YOU?

Culture & Development:

• Friendly Environment: We take pride in our culture and love spending time together.
• Team Spirit: Be part of a supportive team that uplifts each other.
• Mentorship and Coaching: Our colleagues are experts in their field, and you can expect to have a solid team to rely on.
• Personalized Development Program: We realize that one size doesn’t fit all, so you’ll receive an individual development plan tailored to your career aspirations.

Social Benefits:

• Work Flexibility: Embrace flexible working hours and choose from remote, hybrid, or onsite work models.
• Multiple Office Locations: In Sofia, Plovdiv, Stara Zagora, and Nis, you can choose where you would like to work.
• A Suite of Perks: Enjoy food vouchers, additional health insurance and more.
• Community and Connections: Engage in exciting social events and team initiatives.

Empowerment: At Wiser, every role is instrumental. You will have the power to make a difference!

Ready to advance your career with a tech leader passionately driven by innovation? Join Wiser – Become Wiser!