Senior Software Engineer (Python)

Overview

Senior Recruitment Consultant - Software and Data Engineering @ Harnham

Senior Software Engineer (Python) – Up to £80,000 + Benefits

Are you a passionate Python engineer who thrives on building scalable, high-quality software? We’re working with a multi-award-winning digital agency, recognised as one of the Sunday Times Best Places to Work, that’s looking for a Senior Software Engineer (Python) to help shape the next generation of their data-driven tools and products.

Why this role?

• Work at the intersection of data, automation, and AI, delivering tools that drive measurable impact for global brands.
• Join a collaborative, innovative engineering culture where learning, experimentation, and technical excellence are at the core.
• Hybrid flexibility: 1–3 days per week in the London office, balance the rest remotely.
• Be part of a company that has won multiple awards and genuinely invests in its people.

Responsibilities

• Designing, building, and maintaining scalable Python-based applications and microservices.
• Developing internal tools and automation to support both client delivery and internal teams.
• Building, testing, and deploying RESTful APIs using frameworks like FastAPI or Django REST Framework.
• Collaborating with data and platform engineers to integrate new features and optimise performance.
• Ensuring robust engineering practices including CI/CD, TDD, and secure development.
• Supporting and mentoring junior engineers, helping raise the technical bar across the team.
• Staying hands-on while contributing to the architectural direction and long-term roadmap.

What we’re looking for

• 5+ years of experience as a Software Engineer, ideally in Python (3.10+).
• Strong understanding of CI/CD pipelines (e.g. GitHub Actions) and containerisation (Docker).
• Familiarity with databases (SQL, NoSQL, or graph) and API integrations.
• Excellent communicator who thrives in a collaborative, fast-paced environment.
• Experience with Generative AI / LLMs in applied engineering contexts.
• Exposure to infrastructure-as-code (Terraform, CloudFormation, or CDK).
• Familiarity with Vue.js or other front-end frameworks for collaboration with UI teams.
• Salary up to £80,000, depending on experience.
• Hybrid working – 1–3 days per week in London office.
• 25 days holiday + the option to buy 5 more.
• Private medical cash plan, income protection & life assurance.
• Annual performance-based bonus (up to 7%).
• Sabbatical after 7 years’ service, flexible working, and wellbeing contribution.
• Office perks: free breakfasts, snacks, fruit, and weekly lunches.
• Access to Croud Campus and other professional development programmes.
• Inclusive, collaborative environment with strong career growth paths.

Seniority level

• Mid-Senior level

Employment type

• Full-time

Job function

• Information Technology
• Industries: Technology, Information and Media

Note: This posting reflects the current opportunity with Harnham. Referrals increase your chances of interviewing.