Middle/Senior Java Developer

Malmö, SwedenOn-SiteFull-timePosted 22h ago

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Job description

Design, develop, and maintain scalable Java backend services and internal frameworks
Participate in architecture discussions and contribute to technical solution design
Build and support customer-facing services with a focus on reliability, availability, security, and performance
Investigate and resolve complex production issues related to concurrency and distributed systems
Work with authentication, authorization, caching, data storage, and service integrations
Collaborate with multiple engineering teams and coordinate technical dependencies
Participate in code reviews, automated testing, CI/CD processes, and release activities
Prepare technical documentation and communicate technical decisions to stakeholders
Take end-to-end ownership of features and technical solutions from concept to production

4+ years of commercial experience in Java backend development
Strong hands-on experience with Java and distributed systems
Deep understanding of Java internals, including the Java Memory Model, garbage collection, concurrency, and multithreading
Experience debugging production issues in high-load environments
Strong knowledge of distributed systems concepts, including consistency, reliability, partitioning, and failure handling
Experience building and scaling customer-facing backend services
Experience with authentication and authorization mechanisms
Hands-on experience with Cassandra, Redis, Memcached, or similar technologies
Experience developing REST-based services using Netty or similar frameworks
Experience with CI/CD pipelines and automated testing
Strong analytical and problem-solving skills
Upper-Intermediate or higher level of English

WILL BE A PLUS

Knowledge of cryptography standards and protocols such as PKCS, KMIP, X.509, AES, KDF, and CA
Experience working with security- and privacy-sensitive systems
Familiarity with machine learning systems or algorithms
Experience with GitHub
Experience with Maven, Docker, Kubernetes, Spinnaker, or similar tools

PERSONAL PROFILE

Strong sense of ownership and accountability
Ability to work independently in autonomous engineering teams
Analytical and problem-solving mindset
Attention to detail and engineering quality
Strong communication and collaboration skills
Ability to work effectively in complex distributed environments

Job details are sourced from the employer's original posting.

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About the company

Sigma Software

We are looking for a Senior Go Developer to join our dynamic team and work on cutting-edge AdTech solutions. This role offers the opportunity to experiment with AI, LLMs, and emerging technologies while solving complex challenges in large-scale data processing.  CUSTOMER Our customer is a global leader in contextual advertising with more than 500 employees worldwide. They specialize in delivering highly relevant ads by leveraging AI, real-time technology, and large-scale data processing. Operating in the AdTech industry, they are recognized for innovation in Connected TV (CTV) advertising. The team you will join works with the agility of a startup while benefiting from the resources of a global organization. PROJECT You will contribute to the development of a smart advertising platform that processes terabytes of data to understand audiences and deliver precise, contextual ads. The platform combines AI, LLMs, and emerging technologies to push the boundaries of CTV advertising. In this role, you will own innovation end-to-end — from research and prototyping to delivering production-ready solutions.

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Industry: AdTech
Open roles: 49