Full-stack Engineer

• Architect End-to-End Workflow Systems
• Own, build, and iterate on the Workflow Builder across the entire stack
• Drive system design, data modeling, and API contracts
• Participate in cross-functional architectural discussions
• Advance our Front-End Architecture
• Build production-grade visual features using React (v18+)
• Integrate and extend modern component libraries (e.g., MUI, Radix UI, Shadcn/ui)
• Build Scalable and Secure Back-End Services
• Develop high-availability, secure back-end services and microservices
• Design, implement, and maintain highly performant REST or GraphQL APIs
• Define and uphold coding standards
• Deliver High Quality at Scale
• Monitor and optimize full-stack performance metrics
• Write comprehensive test suites
• Partner closely with UX designers and Product Managers
• Mentor & Lead
• Serve as a technical mentor for junior and mid-level engineers
• Contribute to technical roadmap planning
• Strategically Apply AI Tools
• Champion the use of AI-assisted development tools
• Build and evaluate AI-powered features

Senior Software Engineer I, Remote Eligible

• Build and maintain modern web applications using TypeScript and React.
• Develop new product features and improve existing applications.
• Integrate third-party APIs and external services.
• Build internal tools and automations that improve business processes.
• Translate business requirements into reliable, maintainable software.
• Write clean, well-structured, and maintainable code.
• Troubleshoot issues and continuously improve application performance and reliability.
• Participate in code reviews and collaborate with teammates to improve engineering practices.
• Communicate progress, blockers, and technical decisions clearly with the team.

Software Developer

• Join a Remote-First, AI-augmented engineering organization
• Build and maintain backend services, APIs, data persistence, and frontend interfaces
• Work in small increments, integrate frequently
• Co-own data modelling decisions with your team
• Write automated tests as a first-class deliverable
• Deploy and operate software as a team
• Document design decisions and communicate proactively
• Pair with teammates regularly and share effective patterns and tools
• Code review as a team practice

Senior Software Engineer

• Define and evolve architectural solutions that improve system performance, scalability, reliability, and operational excellence
• Design and refine frameworks, tooling, and engineering standards that enhance system resilience and longterm maintainability
• Partner closely with Product, Infrastructure, and Platform teams to embed sound architectural principles into planning, design, and delivery
• Contribute hands-on to critical initiatives, including prototypes, proof-of-concepts, and production systems that demonstrate scalable, maintainable design
• Guide teams in adopting robust distributed system patterns, ensuring fault tolerance, observability, and operational maturity are built in from day one
• Provide thoughtful design reviews and technical guidance that raise the bar for engineering quality and consistency
• Collaborate with engineering leaders to align architectural decisions with business priorities and long-term platform strategy

Software Architect

• Define and evolve architectural solutions that improve system performance, scalability, reliability, and operational excellence.
• Design and refine frameworks, tooling, and engineering standards that enhance system resilience and longterm maintainability.
• Partner closely with Product, Infrastructure, and Platform teams to embed sound architectural principles into planning, design, and delivery.
• Contribute hands-on to critical initiatives, including prototypes, proof-of-concepts, and production systems that demonstrate scalable, maintainable design.
• Guide teams in adopting robust distributed system patterns, ensuring fault tolerance, observability, and operational maturity are built in from day one.
• Provide thoughtful design reviews and technical guidance that raise the bar for engineering quality and consistency.
• Collaborate with engineering leaders to align architectural decisions with business priorities and long-term platform strategy.

• Design, build, and maintain scalable backend services and APIs powering our e-commerce workflows, ensuring consistency, performance, and correctness.
• Design, build, and maintain end-to-end product features spanning across multiple services.
• Collaborate with Product Managers, UX Designers, and engineers to translate business requirements into robust technical solutions.
• Debug and resolve production issues across services and multiple levels of the stack.
• Review peer code to ensure correctness, performance, maintainability, and knowledge sharing.
• Write unit and integration tests and collaborate with QA engineers responsible for API and end-to-end test coverage.
• Continuously improve engineering standards, tooling, and processes.
• Mentor and support junior engineers on backend fundamentals and system design.
• Contribute to scalable, reliable, and maintainable system architecture.

Senior Full Stack Developer

• Engage in full-stack development utilizing modern technologies
• Collaborate with cross-functional teams to deliver high-quality software solutions
• Integrate data workflows and APIs into the SaaS platform
• Implement best practices in coding, testing, and system design

Software Engineer

• Architect and build critical backend services and scalable APIs (Python/FastAPI) that power our AI assurance platform.
• Own the full lifecycle of major platform components - from initial design through deployment, monitoring, and long-term maintenance.
• Build and maintain the Kubernetes-based service orchestration infrastructure that underpins AIP, our core platform.
• Develop responsive, data-rich UIs using React/TypeScript and modern frontend frameworks.
• Manage CI/CD pipelines, infrastructure-as-code (Terraform), and Kubernetes environments for production and customer deployments.
• Implement and maintain security practices: DevSecOps, secrets management, compliance (SOC 2, defence procurement).
• Partner with AI Engineers and Product to translate complex evaluation requirements into pragmatic, robust technical solutions.
• Write production-quality code with strong test coverage; mentor other engineers through code reviews and design discussions.
• Identify and address technical debt proactively; improve platform reliability and maintainability over time.

• Take ownership of a core product in the MariaDB developer tools portfolio. Lead its development, testing and build processes using AI coding agents.
• Implement APIs, SDKs and AI agent skills that make building on MariaDB feel like magic.
• Ensure seamless integration with modern, AI driven development workflows, including popular frameworks, IDEs, and CI/CD pipelines.
• Build and refine the interfaces that DBAs and developers use to interact with our products.
• Work closely with other teams at MariaDB to provide developers and DBAs with the best integrated solution possible.

Principal Software Engineer – Developer Tools

• Design, develop, and maintain high-performance back-end systems using C# and SQL, with a preference for PostgreSQL
• Design and develop user-friendly front end using Vue
• Optimize database performance and ensure data integrity and security
• Develop and maintain RESTful APIs to support front to back integration
• Troubleshoot and debug complex issues in a timely manner
• Write clean, maintainable, and efficient code following best practices
• Participate in code reviews
• Stay updated with the latest industry trends and technologies to ensure our systems remain cutting-edge
• Work directly with a development team in London and California development team members in various time zones

Senior Full Stack Software Engineer

• Design, build, and scale the backend architecture and APIs powering the AI Hub and its autonomous agents (like the AI Sales Agent).
• Implement robust, low-latency integrations between core backend systems, LLMs, and communication channels to support 24/7 real-time automation.
• Ensure consistency, performance, and correctness across high-volume data models and complex backend workflows.
• Own MongoDB schema design and query optimization for complex data structures (including data models optimized for AI context and conversation history).
• Collaborate closely with Product Managers, Software Architects, and AI specialists to translate advanced automation requirements into robust technical solutions.
• Own and lead backend-focused strategic initiatives and architectural improvements within the AI Hub ecosystem.
• Own and lead frontend-focused strategic initiatives and architectural improvements within the AI Hub ecosystem.
• Debug and resolve production issues across the backend stack and infrastructure layer.
• Review peer code with a focus on correctness, performance, and maintainability.
• Write unit and integration tests and functional tests; Mentor junior engineers on backend fundamentals, system design, and AI integration best practices.

Senior Software Engineer – AI Hub

• Design and implement AI-powered features and enhancements across the Sitefinity Cloud platform
• Take ownership of building new functionalities, improvements, and maintaining existing components
• Leverage AI-assisted development tools to improve productivity, code quality, and delivery speed
• Participate in the research and design of software components, with a strong focus on AI-driven architecture and capabilities
• Write clean, maintainable, and high-quality code aligned with modern engineering and AI-first best practices
• Analyze business requirements and proactively propose AI-driven solutions and use cases
• Participate in code reviews, contributing to both engineering excellence and AI adoption practices
• Investigate and resolve complex issues across distributed systems and cloud environments
• Contribute to continuous improvement of the product by exploring new AI technologies, tools, and approaches
• Stay up to date with the latest advancements in AI, cloud, and modern software engineering

Full-stack Engineer jobs in Bulgaria

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Senior Software Engineer I, Remote Eligible

Software Developer

Senior Software Engineer

Software Architect

Software Architect

Senior Full Stack Developer

Software Engineer

Software Engineer

Principal Software Engineer – Developer Tools

Senior Full Stack Software Engineer

Senior Software Engineer – AI Hub

Software Engineer