Senior Software Engineer

2 weeks ago

Bucharest, Bucureşti, Romania FlowX Full time €90,000 - €120,000 per year

At FlowX.AI we are building the engine for the next generation of cognitive enterprise systems - because we believe enterprise software is the software layer that our civilization relies on. Today, our AI platform is used in large banks and empowers both new and experienced users to leverage AI to build complex mission critical applications.

We believe amazing things are created by small teams of brilliant people. Our engineering team today is an all-star team - and we work to keep it that way. It's quality over quantity.

This is a senior-level position, ideal for a highly experienced and independent contributor who thrives in fast-paced, product-focused environments.

Mission

We're building high-performance agents using a modern tech stack, and we're looking for a world-class engineer to help us push the limits.

What you would do on a daily basis
  • Design, build, and own high-performance, low-latency Python microservices and Lambda-based actors that power our AI-driven architecture.
  • Lead initiatives to modernize and improve our backend systems, with a focus on gRPC communication, scalability, and observability.
  • Develop and implement serverless functions to handle CPU/GPU-intensive workloads, integrating seamlessly with our AI toolchains.
  • Own performance benchmarking, observability, and KPIs for your components, proactively addressing bottlenecks and optimizing throughput.
  • Collaborate closely with product, design, and frontend teams to ensure your work delivers meaningful value to users.
  • Contribute to the evolution of our AI integration platform by integrating technologies like LangChain, LangGraph, and other ML/AI frameworks.
  • Take full accountability for the delivery and quality of your work, including testing strategies like TDD, ATDD, and BDD.
Who you are
  • Experience: 8+ years of professional software development experience, including 5+ years working with scalable microservices in both on-premise and cloud environments.
  • Programming: Deep expertise in Python is essential. Bonus points for experience with Java, FastAPI, or Django.
  • Architecture: Strong grasp of microservices, serverless design, and system-level trade-offs (e.g., CAP theorem).
  • Testing: Proven record of applying automated testing practices, including TDD, ATDD, and BDD.
  • Data: Hands-on experience with relational, NoSQL, key-value, and graph data stores.
  • Infrastructure: Familiarity with Kafka, OAuth 2, mTLS, zero-trust architectures, and containerized deployments.
  • Version Control: Proficiency in Git; experience working with monorepos is a plus.
  • AI Integration: Exposure to frameworks like LangChain, LangGraph, TensorFlow, or PyTorch is highly desirable.
  • Mindset: Practical problem-solving skills with a bias for action and delivery. You avoid over-engineering and focus on impact.
What's in it for you
  • A rare opportunity to shape the evolution of a fast-growing product at the forefront of AI and enterprise modernization.
  • A seat at the table: your insights will directly influence our architecture, roadmap, and culture.
  • Exposure to international projects and large enterprise clients from day one.
  • Early-stage equity package, with the opportunity to grow alongside the company.
Location

Bucharest – hybrid or onsite

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