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Ruya AI is a venture-backed defense-tech company building AI-native intelligent software for sovereign institutions operating in mission-critical environments. The company is headquartered in Massachusetts with offices across the US, Europe, and the Middle East.
You'll join the Quant team, responsible for building multi-modal intelligence agents that surface hidden patterns across disparate data sources and generate predictive outcomes for operators. This is a hands-on engineering role focused on designing and building agent systems, tool integrations, and evaluation pipelines.
Core responsibilities include:
- Building asynchronous Python/TypeScript services using FastAPI, Pydantic, and asyncio
- Developing agent orchestration, subagent delegation, tool calling, and structured outputs
- Designing MCP tools and AG-UI/SSE integrations
- Improving prompt, context, memory, and token-management strategies
- Building safeguards against prompt injection, data leakage, and unsafe tool use
- Creating behavioral evaluations and regression datasets using Langfuse
- Tracing model calls and tool execution with Langfuse, Sentry, and OpenTelemetry
- Diagnosing failures across model behavior, tools, data sources, and distributed services
Required qualifications:
- Strong production Python and asynchronous programming experience
- Experience building LLM applications with tool use and multi-step reasoning
- Knowledge of structured output validation and non-deterministic system testing
- Practical understanding of prompt injection and sensitive-data risks
- Ability to evaluate AI behavior empirically
Preferred qualifications include experience with MCP, Langfuse, LiteLLM, Anthropic-compatible APIs, agent memory, CopilotKit, geospatial intelligence, entity graphs, fine-tuning/pre-training of LLMs, agent and memory graph engineering, RAG, and knowledge systems.
The Belgrade office role is in-person based in Serbia, with visa sponsorship and relocation assistance available. The company offers competitive salary, equity through an ESOP, sign-on bonuses, medical/dental/vision insurance, commuter benefits, relocation assistance, and paid time off. Most teams offer one or two remote days per week.
