Senior Software Engineer - AI Hub
About The Position
OfficeRnD is seeking a Senior Software Engineer to join their Bulgaria-based engineering team. This role is a core part of the newly launched AI Hub, an AI automation layer within OfficeRnD Flex, which aims to redefine how flexible workspace operators run their businesses. The position is primarily backend-focused, involving the design and construction of high-performance systems and backend infrastructure for intelligent workflows and autonomous agents, with a secondary focus on front-end work. The ideal candidate will have deep backend expertise, strong API design skills, and the ability to integrate core business logic with AI orchestration, delivering reliable software iteratively. This role is suitable for engineers interested in production-grade AI engineering and autonomous agents.
Requirements
- 5+ years of backend engineering experience in cloud-based, production environments.
- Proficiency in at least one server-side technology (Node.js, Java, or .NET).
- Hands-on experience integrating LLMs or building AI-driven features in production - and genuine curiosity about where autonomous agents are heading.
- Experience designing AI agent architectures - tool/function calling, multi-step reasoning, memory/context management, and observability.
- Strong foundation in API design, distributed systems, and real-time data processing.
- Experience with MongoDB schema design and query optimization.
- Extensive knowledge of software design principles - you default to clean architecture, separation of concerns, and domain modelling.
Nice To Haves
- Familiarity with vector DBs or caching strategies for AI is a plus.
Responsibilities
- 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.
Benefits
- Premium health insurance, including dental coverage
- 25 days of annual paid leave
- An additional day off to celebrate your birthday
- 3 paid volunteering days per year
- Full compensation for the first 3 days of sick leave
- Hybrid work model (minimum 40% of monthly working time onsite)
- Co-funded sports card to support your active lifestyle
- Excellent learning and development opportunities, including access to courses, tools, and internal workshops focused on AI and modern engineering.
- Parking access or a public transport pass.
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What This Job Offers
Job Type
Full-time
Career Level
Senior
Education Level
No Education Listed
