Senior Software Engineer, Payment Protection

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contract

Posted on: 9/22/2025

Origin: • 🇺🇦 Ukraine

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💰 $35 - $40 per hour

Senior

ApacheAWSBigQueryCassandraCloudDistributed SystemsGoogle Cloud PlatformGRPCHBaseJavaKafkaMapReduceNoSQLScalaSparkZookeeper

About the role

Deliver clear, accurate risk assessments at key moments in the end-user journey to prevent fraud and reduce friction.
Build and maintain distributed backend systems using Java or Scala, with large-scale NoSQL databases like HBase, Cassandra, or BigTable.
Design and maintain scalable public APIs and process large datasets with Apache Spark, MapReduce, or similar technologies.
Work with GCP stack (Pub/Sub, Dataflow, BigTable, BigQuery), Kafka, Apache Flink, Dropwizard, gRPC, and Snowflake to deliver production-ready solutions.
Deliver production-quality features over a 4-month contract, with the possibility of extension into next year.
Collaborate with the R&D team (100+ engineers, 40+ in Ukraine) and participate in technical assessments and project deep dives as part of the interview process.

6+ years of experience building distributed backend systems with Java or Scala.
3+ years of experience working with large datasets using Apache Spark, MapReduce, or similar technologies.
Proven experience designing and maintaining scalable public APIs.
Deep expertise with large-scale NoSQL databases (HBase, Cassandra, Bigtable, etc.).
Hands-on experience setting up, managing, and deploying cloud infrastructure (AWS/GCP).
Strong software engineering fundamentals (data structures, algorithms, distributed systems) and excellent debugging, testing, and problem-solving skills.
Experience with GCP stack (Pub/Sub, Dataflow, BigTable, BigQuery), Kafka, Apache Flink, Dropwizard, gRPC, and Snowflake.
Bonus: Experience with stream-processing frameworks (Apache Flink, Apache Beam, Dataflow, etc.).
Bonus: Experience with HBase, BigTable, Kafka, ZooKeeper.