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Senior Backend Engineer (GenAI) (Accessibility Product House)

Sigma Software
Polandfull_timeVerifiedPosted 4 Nov 2025

About the role

Company Description

We’re seeking a Senior Backend Developer to design and build scalable backend solutions for a modern SaaS platform focused on accessibility compliance. 

You’ll optimize performance, shape core architecture, and integrate emerging technologies to ensure reliability and scalability. 

If you’re passionate about high-performance systems and impactful products — we’d love to hear from you! 

CUSTOMER

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

Job Description

  • Design and implement scalable, distributed backend solutions for a SaaS platform  
  • Architect and deliver complex systems focused on accessibility compliance  
  • Plan, execute, and maintain large-scale software delivery systems 
  • Monitor and optimize all aspects of product performance  
  • Research, evaluate, and integrate cutting-edge technologies into the backend architecture  
  • Troubleshoot issues across various backend services and infrastructure  
  • Collaborate on evolving the product's core architecture to meet performance and scale requirements  
  • Lead or contribute to hands-on technical architecture and SaaS infrastructure decisions

Qualifications

  • 5+ years of experience with modern web-scale languages/frameworks, with a focus on Python (additional languages/frameworks: JVM-based, GoLang, TypeScript/Node.js) 
  • Proficiency with at least one major cloud provider (GCP, AWS, or Azure), including serverless and container-based deployments 
  • Proven experience in hands-on design and work on complex SaaS systems 
  • Expertise in modern software design practices 
  • Experience with multiple data stores/services (SQL, NoSQL, ElasticSearch, BigQuery, etc.) 
  • Experience with high-scale stream/message brokering systems (e.g., Kafka, RabbitMQ, CSP-specific equivalents) 
  • Extensive experience in managing and maintaining production systems
  • At least Upper-Intermediate level of English

WOULD BE A PLUS

  • Experience with GenAI-based systems (e.g., RAG, context engineering, agentic work) 
  • Familiarity with Kubernetes and container orchestration platforms 
  • Experience with multiple data stores (RDBMS, NoSQL, OLAP, e.g., ClickHouse) 
  • Experience working with Data Science or GenAI Engineers 
  • Experience with MCPs or agents 
  • Experience in agentic environments (e.g., Cursor, Copilot, Claude Code)

Additional Information

PERSONAL PROFILE

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

 

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Company

Sigma Software

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