Senior Software Engineer, Acquisition

Butternut Box | B Corp

Senior Software Engineer focused on backend infrastructure at Butternut Box. Collaborating with teams to optimize signup funnels, referral loops, and landing pages.

Posted 7/20/2026full-timeRemote • 🇬🇧 United KingdomSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in backend infrastructure development using Ruby on Rails and PostgreSQL, with a strong focus on optimizing system performance and implementing A/B testing methodologies to enhance business metrics. Capable of collaborating effectively with cross-functional teams and mentoring peers in best engineering practices.

Highest-signal resume keywords

Ruby On RailsPostgreSQLA/B Testing MethodologiesBackend EngineeringSystem Performance

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Ruby On RailsPostgreSQLGraphQLA/B TestingData CollectionAnalytics Event TrackingCode ReviewsSystems ArchitectureOOP LanguagesSession Architecture

Soft Skills

Independent WorkDirect CommunicationMentoringCollaborationArticulation of Technical Decisions

Tools & Technologies

Backend InfrastructureThird-Party Tracking IntegrationsCookie ComplianceAnalytics ToolsPair Programming

Industry Keywords

Technical Knowledge RiskCore Business MetricsUser TrackingConversion Rates

Tech Stack

Tools & technologies

GraphQLPostgresPythonRubyRuby on Rails

About the role

Key responsibilities & impact

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.
Your day-to-day focus will be heavily centered on our backend infrastructure (Ruby on Rails, PostgreSQL, GraphQL) to manage discount APIs, optimise session architectures, and support core functionality. We have a dedicated team of frontend experts who own our client-side technologies, though a willingness to collaborate across the stack is always welcome.
Partner closely with our Growth Marketing teams to maintain and optimise third-party tracking integrations. You will help manage server-side data collection, analytics event tracking, and cookie compliance, ensuring we eliminate single points of technical knowledge risk within the squad.
Learn about and champion best practices in code, systems architecture, and engineering processes while actively elevating those around you through pair programming, mentoring, and code reviews.

Requirements

What you’ll need

Significant commercial experience in a senior engineering role with deep, production-grade familiarity with Ruby on Rails (But we are open to other OOP languages i.e Python) and PostgreSQL.
Strong familiarity and hands-on experience implementing structured A/B testing methodologies to drive core business metrics.
The ability to work independently, communicate directly with downstream marketing and product stakeholders, and articulate technical/architectural decisions clearly without needing intermediaries.
An understanding of how backend engineering and system performance directly impact core business metrics, user tracking, and conversion rates.
Completely obsessed with dogs!

Benefits

Comp & perks

25 days holiday (plus 8 bank holidays) and an additional day for every year of service up to 5 years
5 additional, paid 'paws' days off per year dedicated to your learning, development or personal wellbeing. Hit pause when you need it most
£500 personal learning & development budget to sharpen your skills
A significant discount on our Fresh food, to keep your own dogs as healthy as our customers
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 or more years service at Butternut
Discounted gym access through MyGymDiscounts
Lots of office dogs (Ajax, Peggy, Chief, Louis, Hansen, Winnie and many more….)