Senior Java Developer

Sigma Software Group

Senior Java Developer contributing to high-load multi-channel communication platforms for a leading EdTech company. Focused on scalable event-driven architectures and complex delivery pipelines.

Posted 7/4/2026full-timeRemote • 🇵🇱 PolandSeniorWebsite

Tech Stack

Tools & technologies

CloudDistributed SystemsGoogle Cloud PlatformJava

About the role

Key responsibilities & impact

Design and implement a scalable event-driven communications platform
Build highly reliable and fault-tolerant message delivery systems
Manage large-scale real-time event processing pipelines
Design and implement multi-channel delivery pipelines across email, SMS, voice, and push channels
Handle compliance requirements, consent management, and communication policies
Support emergency and high-priority notification workflows
Implement provider failover and resiliency strategies to ensure delivery continuity
Build tracking systems for delivery status, retries, and engagement events
Design and implement observability, reporting, and analytics infrastructure
Develop event processing and message orchestration workflows
Implement provider integrations and external messaging service adapters
Ensure system scalability, throughput, and performance under high load
Collaborate with product and engineering teams on communication flows and requirements
Contribute to architectural decisions and long-term platform evolution
Ensure operational stability, reliability, and maintainability of the system

Requirements

What you’ll need

At least 5 years of software development experience
Strong expertise in Java development
Experience with distributed systems
Strong experience with event-driven architectures
Experience with messaging systems, queues, streams, and brokers
Experience designing high-scale APIs and backend services
Strong understanding of system reliability and fault tolerance
Upper-Intermediate English level
Experience with email or SMS delivery systems would be a plus
Experience with telecom or messaging infrastructure would be a plus
Experience with marketing automation platforms would be a plus
Experience with notification or engagement systems would be a plus
Experience with workflow engines would be a plus
Experience with compliance-heavy systems, including consent and GDPR-like regulations would be a plus
Experience with high-throughput event processing systems would be a plus
Experience with cloud-native platforms, preferably GCP would be a plus

Benefits

Comp & perks

Work remotely in an international engineering environment
Influence architectural decisions
Opportunity to work on long-term product development

ATS Keywords

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Hard Skills & Tools

Software DevelopmentAPI DesignEvent ProcessingMessage OrchestrationHigh-Throughput Systems

Soft Skills

CollaborationProblem-Solving