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2 backend engineer i jobs at 2 companies in Pennsylvania

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Sr. Software Engineer I, Evaluation Services (Scala)
Chicago or California or Colorado or Florida or Georgia or Illinois or Indiana or Minnesota or Missouri or Montana or New Jersey or New York or North Carolina or Ohio or Oregon or Pennsylvania or South Carolina or Texas or Utah or Vermont or Virginia or Washington or Wisconsin
$125k-$175k/yr HybridFull Time
NinjaTrader
NinjaTrader: Privately held futures trading platform and brokerage serving retail and professional futures traders.
5+ YOE5+ years of backend engineering experience with real-time, concurrent, highly available systems; strong Scala, Akka or equivalent, PostgreSQL, event-driven architecture, troubleshooting, technical specification, testing, and communication skills.
Scala, Akka, Pekko, ScalaTest, PostgreSQL, JSONB, Protobuf, SQL, Kafka, Pub/Sub, gRPC, Rust, Go, Datadog, GCP
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Senior Software Engineer I - Ruby on Rails with Sidekiq
Philadelphia or Pennsylvania or New York or United States
$87k-$144k/yr OnsiteFull Time
Elsevier
Elsevier: Dutch academic and medical publisher providing research data, analytics, and clinical decision support to researchers and clinicians.
Requires production Ruby on Rails, Sidekiq, AWS, and TypeScript skills; backend fundamentals; SQL and relational modeling depth; production ownership; debugging ability; and AI-assisted development experience.
Ruby, Ruby on Rails, Sidekiq, AWS, ECS, Aurora PostgreSQL, PostgreSQL, TypeScript, Epic, Cerner, Athena, EHR, FHIR, SQL, CI
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