Senior Java Engineer

4 days ago

Sweden ITtude Full time

Location: Fully remote (Nordics) — must overlap CET working hours

Seniority: Senior — 5+ years Java experience

We're hiring a senior Java engineer to join a small, high-impact team building real-time systems and external API integrations for enterprise customers across the Nordics. You'll own critical data flows, assemble production-grade pipelines, and help design low-latency, highly available services on AWS.

What you'll do

  • Design, implement and operate Java services for real-time workloads (low latency, high throughput).

  • Integrate with external APIs and third-party systems (REST/gRPC, OAuth2, webhooks).

  • Assemble and harden production systems: build pipelines, CI/CD, deployment artifacts, and automated testing.

  • Work with AWS services to deploy and scale real-time infrastructure (e.g., EC2, ECS/Fargate, Lambda, Kinesis/SQS, RDS).

  • Troubleshoot performance and reliability issues; run load tests and production incident post-mortems.

  • Collaborate with product, QA and DevOps to define APIs, SLAs and monitoring

Must-have

  • 5+ years professional experience developing in Java (Java 8+).

  • Proven track record building real-time or low-latency systems (profiling, performance tuning, concurrency).

  • Solid experience integrating with external APIs (designing robust retry, auth, backoff, and contract handling).

  • Experience assembling production systems: build tools (Maven/Gradle), CI/CD pipelines, deployment artifacts and release automation.

  • Hands-on experience with AWS for production services (design, deployment, monitoring).

  • Strong software engineering fundamentals: unit/integration testing, observability (logs/metrics/tracing), and secure coding practices.

  • Fluent English; able to communicate clearly with Nordic stakeholders.

  • Able to work overlapping CET hours for daily syncs.

Strong pluses

  • Experience with streaming technologies (Kafka, Kinesis) or WebSocket-based real-time messaging.

  • Familiarity with container orchestration (ECS, Kubernetes) and infra-as-code (Terraform, CloudFormation).

  • Background in systems programming or low-level optimization (assembly knowledge is a plus).

  • Past work on mission-critical enterprise integrations or regulated environments.

  • Experience with performance testing tools and techniques (JMeter, Gatling, async profiling).

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