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About the Role

As a Senior Software Engineer in the Acquisition Squad, you will be the driving force behind key application and web development projects that directly fuel our growth. You will work closely with product managers, designers, growth marketers, and fellow engineers to build features and products that optimize our signup funnels, referral loops, and landing pages to delight prospective customers.

Responsibilities

• Contribute to the architecture and development direction of the squad to ensure high-quality, maintainable, modular, and reliable code is shipped across our acquisition stack.
• Focus on backend infrastructure (Ruby on Rails, PostgreSQL, GraphQL) to manage discount APIs, optimize session architectures, and support core functionality.
• Collaborate with frontend experts on client-side technologies.
• Partner closely with Growth Marketing teams to maintain and optimize third-party tracking integrations.
• Manage server-side data collection, analytics event tracking, and cookie compliance.
• Eliminate single points of technical knowledge risk within the squad.
• Champion best practices in code, systems architecture, and engineering processes.
• Actively elevate team members through pair programming, mentoring, and code reviews.

Requirements

• Significant commercial experience in a senior engineering role.
• Deep, production-grade familiarity with Ruby on Rails (or other OOP languages like Python) and PostgreSQL.
• Strong familiarity and hands-on experience implementing structured A/B testing methodologies.
• Ability to work independently.
• Ability to communicate directly with downstream marketing and product stakeholders.
• Ability to articulate technical/architectural decisions clearly.
• Understanding of how backend engineering and system performance impact core business metrics, user tracking, and conversion rates.
• Obsessed with dogs.
• Experience with React and TypeScript (nice to have).
• Experience with or exposure to third-party tracking & analytics tools like Segment, Google Tag Manager (GTM), Meta Pixel, Google Ads, or Amazon Advertising (nice to have).
• Familiarity with modern web architectures like GraphQL, Storyblok, and Vercel deployment workflows (nice to have).
• Exposure to Next.js (nice to have).
• Prior experience in fast-paced B2C/B2B startup environments, subscription models, or international e-commerce platforms (nice to have).
• Right to work in the UK (visa sponsorship not offered).

Skills

• Ruby on Rails
• PostgreSQL
• GraphQL
• A/B Testing
• Backend Development
• System Architecture
• React
• TypeScript
• Segment
• Google Tag Manager (GTM)
• Meta Pixel
• Google Ads
• Amazon Advertising
• Next.js

Location

• Remote
• West London Office

Work Type

• Remote
• Hybrid (3 days a week in office)

Experience Level

• Senior

Benefits

• 25 days holiday plus 8 bank holidays
• Additional holiday day for every year of service up to 5 years
• 5 paid 'paws' days off per year for learning, development, or wellbeing
• £500 personal learning & development budget
• Significant discount on fresh food
• Enhanced parental leave
• Flexible core working hours
• Cycle to work scheme
• Pension with NEST
• Private Medical Insurance with Vitality
• Private Dental Insurance with Bupa
• Paid time off for fertility treatments and pregnancy loss
• Paid sabbaticals for squad members with 5+ years service
• Discounted gym access through MyGymDiscounts
• Office dogs

About the Company

• We believe dogs deserve the healthiest, most natural and tastiest meals - with none of the nasties.
• We make freshly prepared food, cooked like home and delivered direct to customers in perfect portions.
• We are a B-Corp certified company.
• We are a sustainable business that cares about our people, products, and the planet.
• Our goal is to help dogs live healthier, happier, and longer lives.
• We feed hundreds of thousands of hungry dogs across the UK and Europe.
• We are looking for brilliant people who share our ambition.

Equal Opportunity

• We believe in a seat at the table for everyone.
• Butternut Box is an equal opportunity employer.
• We believe that to make the best food for all dogs, we need a team that represents all humans.
• We celebrate different nationalities, backgrounds, experiences and perspectives.
• We are specifically committed to increasing representation from underrepresented groups.
• We want a strong, diverse team built from different identities and lived experiences.
• We are dedicated to the ongoing work of building an inclusive, supportive place where you can do the best work of your career.