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Senior Software Engineer at Weekday-1 | London

Weekday-1London, England, United Kingdom
On-site Full-time

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Experience Level

Senior

Qualifications

Key Responsibilities:Design and implement scalable backend systems and APIs using Python. Develop, fine-tune, and deploy LLM-powered applications for use cases such as chatbots, content generation, summarization, and semantic search. Integrate third-party LLM APIs and open-source models into production systems. Optimize model performance, latency, and cost efficiency in real-time applications. Create robust data pipelines for preprocessing, training, and inference workflows. Maintain high code quality through testing, code reviews, and adherence to best practices. Collaborate with cross-functional teams to translate business requirements into technical solutions. Stay current with advancements in AI/ML, particularly in the LLM domain, and assess new tools and frameworks. Mentor junior engineers and contribute to the technical leadership within the team. Required Qualifications:6-12 years of professional software engineering experience with a strong emphasis on Python. Demonstrated experience in building and deploying production-grade systems. Hands-on experience with LLMs, such as GPT-based models and frameworks like LangChain or LlamaIndex. Strong understanding of RESTful APIs, microservices architecture, and distributed systems. Familiarity with cloud services like AWS, GCP, or Azure. Knowledge of databases (SQL/NoSQL) and data processing pipelines. Solid grasp of software development best practices, including version control, CI/CD, and testing. Preferred Qualifications:Experience with model fine-tuning, prompt engineering, and evaluation techniques. Familiarity with vector databases and embeddings (e.g., FAISS, Pinecone, Weaviate).

About the job

About the Role

Weekday-1 is hiring a Senior Software Engineer in London to help build and scale intelligent systems with Python and Large Language Models (LLMs). This role focuses on designing, developing, and deploying AI-driven solutions for real-world problems.

What You Will Do

  • Design and implement systems that use LLMs in production settings
  • Work across the full development lifecycle, from architecture through deployment
  • Collaborate closely with product, data, and research teams to deliver reliable, high-performing solutions
  • Ensure that AI systems meet performance and reliability standards

What We’re Looking For

  • Extensive experience with Python
  • Strong background in integrating and scaling Large Language Models
  • Ability to work collaboratively as a senior member of an engineering team

Location

This position is based in London, England, United Kingdom.

About Weekday-1

Weekday-1 is dedicated to leveraging advanced technology and innovative solutions to address real-world challenges. Our commitment to excellence drives us to attract top talent and deliver impactful results for our clients.

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