Back-End Engineer (Scala/Lua) – Scale Cloud APIs

LotusFlare; Kraków; Hybrid; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Yearly bonus

Paid lunches

MultiSport card

Private medical insurance

Reimbursement of accountant assistance

ZUS coverage

Paid sick leaves

21 working days of vacation

Training and workshops

Job summary

LotusFlare is seeking a Software Engineer for the Server Engineering team to build a scalable backend powering millions of API calls, collaborating with engineering and Mobile Operator to implement robust cloud-native services.

You should have strong Java/JVM and distributed systems experience, with a focus on security, performance, and reliable networking. Relocation to Krakow is supported under our hybrid work model.

Qualifications

• 3+ years of work experience with Java/JVM, PHP, C++, Scala or Lua.
• BA/BS in Computer Science or related technical field.
• 3+ years building secure, scalable web services.
• Experience with distributed systems.
• Experience with RESTful services.
• Good understanding of network stack and HTTP.
• Experience with concurrency, multithreading, or asynchronous programming.
• Data modeling in SQL and/or NoSQL.
• Experience with AWS, Redis, Kafka and Cassandra would be a plus.

Responsibilities

• Collaborate with the Server Engineering team to build and scale the backend infrastructure.
• Develop, secure, and scale backend services to support millions of concurrent API calls.
• Contribute to designing a robust network stack and cloud-native components.

Skills

Java/JVM

Distributed systems

RESTful APIs

Networking & HTTP

Concurrency/Async

Data modeling

Web security

Education

BA/BS in Computer Science

Tools

AWS

Redis

Kafka

Cassandra

Job description

LotusFlare is seeking a Software Engineer for the Server Engineering team to build a scalable backend powering millions of API calls, collaborating with engineering and Mobile Operator to implement robust cloud-native services.

You should have strong Java/JVM and distributed systems experience, with a focus on security, performance, and reliable networking. Relocation to Krakow is supported under our hybrid work model.