Senior Software Engineer, Payment Protection (full-time contractor position)

Sift is the leader in Digital Trust & Safety, helping businesses protect themselves and their customers from fraud and abuse. We combine machine learning, behavioral analytics, and cutting-edge AI to power trust and reduce friction across the internet’s most valuable platforms.

We’re looking for a Senior Software Engineer to join our Payment Protection team and help shape the future of Trust & Safety. By delivering clear, accurate risk assessments at key moments in the end-user journey, we enable businesses to prevent fraud losses while creating seamless, adaptive experiences for their customers.

Our R&D team includes more than 100 engineers, with over 40+ based in Ukraine.

Our technology stack includes Java, GCP (Pub/Sub, Dataflow, BigTable, BigQuery), Kafka, Apache Flink, Dropwizard, gRPC, and Snowflake.

What We’re Looking For:

• 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.

Bonus Points For:

• Experience with stream-processing frameworks (Apache Flink, Apache Beam, Dataflow, etc.).

• Experience with HBase, BigTable, Kafka, ZooKeeper.

Over the next 4 months, you will:

• 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 our GCP stack (Pub/Sub, Dataflow, BigTable, BigQuery), Kafka, Apache Flink, Dropwizard, gRPC, and Snowflake to deliver production-ready solutions.

• Operate with high autonomy, minimal meetings, and a flexible schedule while driving meaningful impact.

• Deliver production-quality features, with the possibility of extending your contract into next year.

Interview Process:

• 45 min Intro with Recruiter.

• 60 min Technical assessment (coding + architecture design).

• 45 min Project deep dive.

• 30 min Behavioral interview with Engineering Manager.

Visit us at sift.com and follow us on LinkedIn.