Senior Software Engineer Python

Harnham - Data & Analytics Recruitment; London; Hybrid; GBP 100,000 - 110,000; Full time

Job summary

A leading fintech company in the UK is seeking a Senior Software Engineer specializing in Python to join their growing team. You will design and scale APIs and services, influence architecture, and mentor juniors while working in a hybrid environment. This role offers a competitive salary, benefits, and the chance to impact fair credit products for thousands of customers.

Benefits

Company bonus scheme

25-30 days holiday + bank holidays

Enhanced pension & life cover

Ongoing training and mentoring

Inclusive, ambitious team culture

Qualifications

• 7+ years of experience in software engineering.
• Strong Python skills, preferably with FastAPI, Flask, or Django.
• Experience with AWS or Azure cloud platforms.

Responsibilities

• Design, build and scale modern APIs and backend services in Python.
• Lead technical delivery across greenfield and legacy systems.
• Collaborate with product and DevOps teams.

Skills

Python

Agile mindset

API design

Education

STEM degree (Russell Group or Red Brick ideal)

Tools

AWS

Azure

FastAPI

Flask

Django

React

Job description

Role: Senior Software Engineer (Python)Salary: £100,000-£110,000 + BonusWFH: Hybrid - 2-3 days/week in-office (Central London)

Overview

Our client is a profitable and fast-growing UK fintech helping over 800,000 customers improve their financial health. Backed by strong leadership and AI-driven innovation, the company is building a brand-new mobile app and scaling its engineering team to support rapid product delivery.

They're now hiring a Senior Python Engineer to join this lean, high-impact team and help shape the future of fair, tech-driven credit products.

Key Responsibilities

• Design, build and scale modern APIs and backend services in Python
• Lead technical delivery across greenfield and legacy systems
• Collaborate closely with product and DevOps teams
• Write maintainable, testable, high-performance code
• Influence architecture and mentor junior engineers
• Balance delivery with strategic thinking in a fast-moving environment

Ideal Candidate

• 7+ years of experience in software engineering
• Strong Python (FastAPI, Flask, or Django preferred)
• AWS or Azure cloud exposure
• Frontend awareness (e.g. React)
• Agile mindset; thrives in lean, delivery-focused teams
• Passionate about AI and emerging tech
• Holds a STEM degree (Russell Group or Red Brick ideal)
• UK, ILR or Settled Status required (no sponsorship available)

Benefits

• Up to £110,000 base salary
• Company bonus scheme
• Hybrid working (2-3 days/week in-office)
• 25-30 days holiday + bank holidays
• Enhanced pension & life cover
• Ongoing training and mentoring
• Inclusive, ambitious team culture

Interview Process

HR Intro + CV Review

Technical Deep Dive

Python Task or Design Challenge

Final with CEO + Leadership (vision & ambition focus)

This is a rare chance to join a profitable fintech scaling fast - and help redefine access to fair financial products in the UK.