Backend Engineer

SPsoft is looking for a Strong Junior Python Engineer with commercial experience in backend development and interest in AI/LLM technologies to participate in the development of a scalable AI Voice Agents platform.

The ideal candidate has a product-thinking and product-design mindset. You should be proactive and think ahead rather than wait for the next task in the pipeline. It is mandatory to be able and willing to work in a fast and intense startup environment for 200+ hours per month. In return, you will be eligible for equity and benefit from a successful startup exit.

If you’re looking for a relaxed job at a moderate pace — please do not apply.

Duties and responsibilities

• Develop and maintain backend services using Python and FastAPI (or similar frameworks).
• Integrate LLMs (OpenAI, Claude, Gemini, etc.) into AI-powered applications.
• Participate in building APIs and microservices for Voice AI solutions.
• Write clean, maintainable, and well-documented code.
• Debug and troubleshoot application issues.
• Collaborate closely with engineers, product managers, and AI specialists.
• Learn and apply modern AI engineering best practices.

Required skills and experience

• 1.5+ years of commercial Python development experience.
• Experience with FastAPI and asynchronous programming (asyncio).
• Understanding of REST APIs and WebSockets.
• Experience working with LLM APIs or AI-powered applications.
• Knowledge of database technologies such as PostgreSQL, MongoDB, or similar.
• Understanding of Redis and message brokers such as Kafka or Pub/Sub.
• Experience with with Docker and Git workflows
• Strong problem-solving skills and willingness to learn quickly.
• Intermediate+ English level.

Will be a plus

• Experience with Retrieval-Augmented Generation (RAG).
• Experience with cloud platforms (AWS, GCP, Azure).
• Experience with asyncio or asynchronous programming.
• Understanding of CI/CD pipelines.
• Experience with speech-to-text (STT) or text-to-speech (TTS) technologies.
• Personal AI/LLM side projects or open-source contributions.

What’s in it for you

• You will be working as a part of our engineering team as an individual contributor, meaning that a lot will depend on you.
• You will have to learn how to co-create and co-design the product, not just write code based on the pre-digested specifications written for you by somebody else.
• As an end-to-end co-product designer/software engineer, you will learn to deliver more value.
• You will develop much faster than the fractional role at one of the big “galleys.”

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