Senior Python Engineer

£450 PD (Outside IR35) | 3-to-6-month Contract | 2 days onsite in London (Hybrid) | ASAP Start

Our trusted technology partner is developing innovative products and is looking for an experienced Senior Python Engineer / Back End Developer to join a fast-moving team.

You will develop Python microservices, scalable services, voice chat, and data pipelines, using AI technologies including ASR, TTS, and LLMs.

The ideal candidate will have strong Python skills, a pragmatic delivery-focused approach, and the ability to take ownership in a fast-paced, evolving environment.

Key Responsibilities:

• Develop and maintain scalable Python services, microservices, voice chat, and data pipelines.


• Work with the Tech Lead and wider team on architecture, technical decisions, and solution design.


• Collaborate with product, data science, QA, design, and subject matter experts to deliver new features.


• Ensure applications meet high standards for performance, scalability, reliability, and quality.


• Contribute to code reviews, technical discussions, requirements, and user stories.


• Take ownership of technical issues and support an end-to-end DevOps approach.


• Mentor less experienced developers and share technical knowledge.


• Stay current with developments in AI, cloud engineering, and language assessment.

Key Skills & Experience:

• Strong commercial Python development experience, including object-oriented and functional programming.


• Strong experience with FastAPI, Pydantic, SQLAlchemy, Alembic, Pytest, and type checking.


• Experience with Pandas, NumPy, Jupyter, OpenTelemetry, Git/GitHub, GitHub Actions, and Docker.


• Experience developing microservices and/or Lambda-based solutions.


• Strong experience with PostgreSQL.


• Experience working with AI/ML technologies, particularly ASR, TTS, LLMs, or related tooling, is highly desirable.


• AWS, Terraform, Kubernetes, Hugging Face, PyTorch/TensorFlow, or Generative AI tooling would be advantageous.


• Strong communication, stakeholder management, analytical, and problem-solving skills.


• Comfortable taking ownership and working in a fast-paced, constantly evolving environment.

This is an excellent opportunity for a Senior Python Engineer / Back End Developer to work on a cutting-edge product using modern microservices, cloud, and AI technologies within a fast-paced, collaborative team.