Lead Python Backend Engineer (APIs, FastAPI) – Hybrid

Client Server; Greater London; Hybrid; GBP 96,000 - 120,000; Full time

Job summary

Client Server is seeking a Lead Software Engineer to head a small, skilled tech team in London, delivering features and refactoring efforts on a core banking platform. The role involves a 50/50 split between architecture/design and people management, with mentoring and performance reviews for junior developers.

You will work on API development (FastAPI), cloud services (GCP preferred), and robust CI/CD practices, contributing to a modern, evolving fintech stack in a hybrid London-based setting.

Qualifications

• Proficient Python backend development with SDLC experience.
• Experience leading a small engineering team and mentoring developers.
• Knowledge of cloud services (GCP preferred; AWS/Azure also acceptable).
• Experience building APIs, ideally with FastAPI.
• Strong CI/CD, testing, and deployment practices.

Responsibilities

• Lead a small tech team, deliver new features and refactors
• Set engineering standards and mentor juniors with 1-2-1s and performance reviews
• Collaborate on architecture/design with ~50/50 focus on technical and people management
• Develop and maintain APIs and cloud-based services, ensure robust CI/CD pipelines

Skills

Python

Team leadership

Cloud platforms

API design

CI/CD

Testing

OOP & patterns

Education

Bachelor's degree in STEM

Tools

FastAPI

Git

Job description

Client Server is seeking a Lead Software Engineer to head a small, skilled tech team in London, delivering features and refactoring efforts on a core banking platform. The role involves a 50/50 split between architecture/design and people management, with mentoring and performance reviews for junior developers.

You will work on API development (FastAPI), cloud services (GCP preferred), and robust CI/CD practices, contributing to a modern, evolving fintech stack in a hybrid London-based setting.