Senior Java/Kotlin Backend Developer

What teams you can join and what tasks you have to do

Сore:

• Ensuring the stability and fault tolerance of the entire backend. This includes service mesh integration: client-side request balancing, service discovery, circuit breaker, end-to-end tracing and graceful degradation.
• Optimization of interservice communication: implementation of binary protocols, where necessary.
• Optimization of work with databases and queues. Functional sharding and encapsulation of bases behind services.

Push:

• Organization of uninterrupted distribution of individual push notifications to users, tens of thousands per second. Scaling of sending, distributed caches.
• ML integration: selection of appropriate push options for each user, data processing for network training.
• Implementation of complex product experiments: on-the-fly image processing.

Feed:

• Generation of individual user feeds based on neural networks. This includes the organization of a feature-store to support inference and neural network training, optimization of the architecture for the implementation of two-level recommendations.
• Optimization of feeds formation process.

Security:

• Behavioral analysis: automatic detection of compromised accounts, user reputation service.
• Encryption and protection of user data.
• Anti-bots and anti-DDoS measures: CAPTCHA, rate limits.

What you need to join us

• Extensive experience in backend development in Java / Kotlin + MongoDB + Spring Framework.
• Be able and love to write clean code, use the DDD approach and follow SOLID principles.
• Sense of humor.