• Develop and maintain web applications using Node.js and React • Collaborate with various teams on multiple projects • Lead technical direction and implementation standards

• As a Staff AI Backend Engineer, you own the technical backbone of our Decision Intelligence platform and the architecture that lets it scale. • You set the direction for how we build scalable backend services that bring our forecasting and optimization models, agentic workflows, and our semantic data layer into productive use. • You work AI-first: Claude Code or similar CLIs, MCPs, and custom skills are your standard toolkit, and you define how the rest of the team uses them. • You think not only in terms of endpoints and databases, but in customer value, product impact, and adoption - and you are relentless about strengthening the system, not just solving the task at hand. • With a strong product mindset, you set technical direction: defining how we measure feature adoption, instrumenting usage patterns, and steering the roadmap with Product and FDE — accountable to outcomes, not output. • Scalable backend services in Python (FastAPI, Pydantic) for agent workflows, forecasting, and replenishment are yours to architect, build, and operate — including the decisions, trade-offs, and standards behind them. • Clean API and service contracts between platform, agents, ML models, frontend, and customer systems (ERP, BI, planning tools) are designed by you, with robustness, observability, and reliability as first-class properties. • Our semantic data layer — the foundation for accurate forecasts and precise agent responses — is yours: PostgreSQL modeling, dbt transformations, pipelines, caching, and retrieval, built to scale across customers and use cases. • How we integrate LLM and agent systems into the backend is defined by you: tool use, function calling, RAG pipelines, eval frameworks, guardrails, and production deployment — setting the patterns and quality bars the team builds against. • Driving our AI-first engineering culture is central: Claude Code, AI-assisted development, and subagents are part of your daily toolkit, and you evolve our internal setup (CLAUDE, hooks, skills, plan/execute/review loop, plugins, docs) so the team ships faster and safer. • Ambiguous business and customer requirements get translated into coherent technical strategy with FDEs and Product, making pragmatic trade-offs between speed, scalability, and maintainability — explained clearly to technical and non-technical stakeholders. • Prototyping fast and close to the user, you put ideas into FDEs' and customers' hands in days, gather feedback autonomously, iterate on the real workflow, and decide from actual usage what to harden and roll out. • Through code and design review, mentoring, documentation, and standards, you raise the engineering bar — growing the people around you and making the system more resilient over time.

Role Description You will be: - Develop, maintain, and improve Ruby on Rails applications supporting business-critical processes and workflows. - Work primarily within monolithic application architectures while contributing to modernization and architectural improvements. - Implement backend features, integrations, and business logic using Ruby and Ruby on Rails. - Collaborate with frontend developers to support integrated user experiences and maintain legacy frontend components where required. - Participate in the implementation of Event-Driven Design and Domain-Driven Design (DDD) principles within evolving application architectures. - Write and maintain comprehensive unit and integration tests using RSpec and/or Minitest. - Work closely with Product Owners, QA engineers, and client stakeholders to refine and implement business requirements. - Manage deployments and support delivery processes across multiple environments, including legacy on-premises infrastructure and containerized platforms. - Contribute to CI/CD processes, automation, and operational improvements using modern DevOps practices and tooling. - Support troubleshooting, debugging, performance optimization, and production stability activities. - Ensure high code quality through code reviews, testing, refactoring, and continuous improvement initiatives. Qualifications - Commercial experience as a Ruby Developer in modern web application environments. - Strong hands-on experience with Ruby on Rails and the Ruby ecosystem. - Good understanding of monolithic application architectures and backend application design. - Experience with Ruby ecosystem tools such as Bundler and RubyGems. - Strong experience writing unit and integration tests using RSpec and/or Minitest. - Practical experience with MySQL / MariaDB and Redis. - Experience working with frontend integration technologies such as NodeJS, Yarn, and Webpacker. - Basic familiarity with AngularJS or maintaining legacy frontend components. - Experience with deployment and infrastructure automation tools such as Capistrano, Ansible, and Docker. - Good understanding of CI/CD workflows and DevOps practices. - Experience with Git-based development workflows, including GitHub or Azure Repos. - Practical experience working with Azure DevOps Pipelines or similar CI/CD platforms. - Familiarity with Linux-based environments, preferably RedHat. - Basic understanding of container orchestration concepts, including Kubernetes / AKS environments. - Experience working with secure enterprise access environments and tooling. - Awareness of security best practices and experience using security scanning tools such as Snyk or equivalent. - Experience managing dependencies and private packages repositories. - Understanding of SPA concepts and modern frontend development practices. - Good understanding of Event-Driven architectures and Domain-Driven Design principles. - Ability to troubleshoot and navigate across the full application stack, from database to frontend layer. - Practical experience using AI-powered assistants (e.g. Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision-making in software delivery. Requirements - Work from Bulgaria and a work permit are required. - Work from the European Union region and a work permit are required. Nice to have - Experience modernizing legacy Ruby on Rails applications. - Experience working with enterprise-scale monolithic systems. - Knowledge of containerized and cloud-adjacent deployment environments. - Experience contributing to architectural modernization initiatives. - Experience applying GenAI in a more structured way within the SDLC, including defined workflows, prompt patterns, or tool integrations embedded into daily work. - Interest in and familiarity with emerging AI-driven practices (e.g. agent-based workflows, automation patterns, AI-augmented development), with a willingness to explore and experiment beyond standard approaches. Recruitment Process - CV review - HR call - Interview - Client Interview - Decision

• Develop and maintain high-availability, high-performance .NET back-end applications; • Participate in defining architecture and designing technical solutions; • Develop APIs and microservices following best practices and internal architecture; • Analyze and resolve complex issues in production environments; • Ensure code quality through automated testing, code reviews, and development standards; • Work closely with multidisciplinary teams using agile methodologies; • Mentor junior developers and contribute to the team's technical growth.