Senior Back-end Engineer (Accessibility Product House)

SigmaSoftware2

Warsaw, Masovian Voivodeship, Poland Remote permanent

Posted: January 7, 2026

Required Skills

Job Description

We’re looking for an experienced Back-end Engineer to join our innovative team. In this role, you’ll be responsible for designing and implementing scalable, distributed Back-end solutions for a SaaS platform. 

Help scale a fast-growing accessibility SaaS platform as a Senior Back-end Engineer using Go, cloud, microservices, and big data tools. 

CUSTOMER

Our client is a rapidly growing technology leader in digital accessibility software that helps enterprises make their web and mobile products accessible to everyone. Its AI-enabled products save developers time and reduce risk via proprietary discovery and analysis algorithms that integrate directly into software development pipelines. 

• Design and implement scalable, distributed Back-end solutions for a SaaS platform 
• Architect and deliver complex systems focused on accessibility compliance 
• Plan, execute, and maintain large-scale software delivery pipelines 
• Monitor system health and optimize performance across services 
• Research, evaluate, and integrate modern technologies into the Back-end architecture 
• Troubleshoot issues across various Back-end services and infrastructure 
• Collaborate on evolving the product’s core architecture to meet performance and scalability requirements 
• Lead or contribute to hands-on technical architecture and SaaS infrastructure decisions 

• 5+ years of hands-on Back-end development experience in at least 2 of the following programming languages: Golang (primary), Node.js, Python, Kotlin, or other JVM-based languages 
• Proficiency with at least one major cloud provider (GCP, AWS, or Azure) 
• Some experience with Elasticsearch and BigQuery 
• Proficiency with at least one messaging/streaming system (e.g., Kafka, Flink, Spark, Pub/Sub, or RabbitMQ) 
• Strong background in microservices architecture, distributed systems, serverless, and high-scalability systems 
• Familiarity with production monitoring and performance optimization  
• Familiarity with CI/CD pipelines and deployment processes 
• At least Upper-Intermediate level of English  

WOULD BE A PLUS

• Familiarity with ClickHouse 
• Experience in Full Stack and/or Front-end development 

PERSONAL PROFILE

• Independent, excellent problem solver and passionate about learning new things  
• Great communicator and team player with a total commitment to providing the best services to all stakeholders 

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