Overview

Senior Software Engineer - Key Skills > Typescript, Python, React & AWS

We’re looking for a Senior Software Engineer to shape the future of Harper’s technology. This is a hands-on role focused on building and improving our core systems to ensure reliability, scalability, and a seamless experience for customers and brand partners.

You’ll work closely with our CTO and product team to develop new features, improve system performance, and solve complex technical challenges. You should be comfortable working across the stack, writing clean, maintainable code, and taking ownership of your work.

Logistics

• Employment type: Permanent
• Location: Hybrid. 1–2 days per week in our London office

Who we are

• We’re a small, ambitious product team of experienced technologists.
• We care deeply about the products we build and take full ownership of them.
• We experiment regularly and iterate quickly.
• We build and evolve new products that make a difference to our customers, our team, and the business.
• We care about scale. Our business is growing rapidly and we use modern, best-practice approaches to stay ahead.
• We believe in collaborative design and architecture, and empower each other to lead.
• We’re embracing AI development tools and are looking for measurable gains from using them. If we achieve 2x speed regularly, we consider that a success.

Who we’re looking for

• We’re looking for a collaborative and experienced engineer to join us on our journey.
• You’ve worked in/with startups and understand the pace and ownership that comes with that.
• You’re not expected to know all our tech, but you’ll be confident and proficient in your core areas.
• You take ownership of your work and communicate clearly.
• You’re curious about AI tooling and excited to help the team learn and grow in this space.
• You have experience with A/B testing, analytics tools, and growth-focused product development.
• You understand performance optimisation, event driven architecture, API integrations, and how to improve user experience.
• You’re comfortable working autonomously and driving projects from idea to delivery.
• You can analyse data and use it to inform decisions.
• Experience with AWS is a plus.
• Familiarity with e-commerce platforms like Shopify, Centra or BigCommerce is a plus.

What we offer

• Competitive salary of £85,000
• 32 days holiday (take public holidays whenever you like) with a 3-day carryover policy
• £600 annual wellbeing allowance
• MacBook Pro
• Regular team socials
• 30-minute intro videocall – we’ll get to know you and tell you more about Harper and the role.
• 90+-minute culture and tech fit interview – we’ll dive into your experience and motivations. As part of the discussion, there will be a whiteboard exercise related to our architecture.

Role details

• Seniority level: Mid-Senior level
• Employment type: Full-time
• Job function: Engineering and Information Technology
• Industries: Retail Apparel and Fashion