Senior Software Engineer

Harper; London; Hybrid; GBP 70,000 - 90,000; Full time

Job summary

A leading company in the retail sector is seeking a Senior Software Engineer to enhance their technology and customer experience. This role involves close collaboration with the CTO and product team, focusing on system reliability and performance. Ideal candidates will thrive in a fast-paced environment and have experience with A/B testing and analytics tools.

Benefits

32 days holiday

£600 annual wellbeing allowance

MacBook Pro

Regular team socials

Qualifications

• Experience with A/B testing and analytics tools.
• Comfortable working autonomously and driving projects.
• Experience with AWS is a plus.

Responsibilities

• Develop new features and improve system performance.
• Solve complex technical challenges across the stack.
• Ensure reliability and scalability of core systems.

Skills

Collaboration

Ownership

Performance Optimisation

Data Analysis

Tools

AWS

A/B Testing

Analytics Tools

E-commerce Platforms

Job description

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Harper’s mission is to keep personal service at the heart of the shopping experience in the digital world. We power elevated Try Before You Buy experiences for premium and luxury retailers including ME+EM, Victoria Beckham, RIXO and LK Bennett. Our focus on customer experience has earned us one of the highest-rated Trustpilot pages and a market-leading Net Promoter Score of 88.

We are backed by high-profile tech investors and work with some of the world’s leading retailers, from Dior to Selfridges. As we continue to scale, we’re expanding our technology team to build a world-class product that makes online fashion shopping completely effortless.

See the service in action at harperconcierge.com.

Role overview

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.

This is an exciting opportunity for someone who thrives in a fast-paced environment, enjoys solving hard problems, and is motivated by building technology that powers a truly differentiated shopping experience.

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 look 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 it.
• 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 development.
• You understand performance optimisation, 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

• 32 days holiday (take public holidays whenever you like) with a 3-day carryover policy
• £600 annual wellbeing allowance
• MacBook Pro
• Regular team socials
• 15-minute intro call – we’ll get to know you and tell you more about Harper and the role.
• 30-minute culture and tech fit interview – we’ll dive into your experience and motivations
• 60-90-minute tech scenario interview – we’ll give you a scenario and ask you questions about this

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Engineering and Information Technology

• Industries

  Retail Apparel and Fashion

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