Senior Backend Engineer: AI-Driven, Distributed Systems

Fresha; Greater London; On-site; GBP 70,000 - 110,000; Full time

Job summary

Fresha, the leading marketplace platform for beauty and wellness, seeks a Senior Backend Engineer based in London (Old Street) onsite four days a week, with remote Wednesdays. You will build scalable Ruby/Elixir code and collaborate across product, design, frontend, and infra teams to ship features end-to-end.

In this role, you’ll operate in a polyglot stack (Ruby, Elixir, GraphQL, TypeScript, gRPC) with Kafka and Kubernetes, embracing Domain-Driven Design to deliver high-impact product outcomes

Qualifications

• Deep experience building and interacting with AI agents, using them to amplify output while adhering to architecture and security standards.
• Experience building and maintaining globally distributed systems.
• Knowledge of event-driven architectures, including Kafka.
• 5+ years of experience in product engineering, developer tools, or infrastructure at scale.
• Pragmatic generalist who thrives on learning new frameworks and tackling complex challenges.
• Familiarity with languages such as Elixir, Ruby, or TypeScript is a plus.

Responsibilities

• Collaborate closely with Product, Design, Frontend, Infrastructure, and Mobile engineers to take features from discovery to rollout and beyond.
• Be responsible for features from discovery to observability, including technical design, implementation, testing, and rollout.
• Design, build, and maintain efficient, scalable, and reliable Ruby/Elixir code.
• Work with a polyglot stack including Ruby, Elixir, GraphQL, TypeScript, and gRPC, as well as modern messaging systems like Kafka.
• Operate within a Kubernetes-driven environment as we continue moving to a microservice architecture.
• Embrace Domain-Driven Design to build high-quality, impactful products from inception to delivery.

Skills

AI agents

Distributed systems

Event-driven architecture

Domain-Driven Design

Elixir

Ruby

TypeScript

Kafka

Kubernetes

GraphQL

gRPC

GitHub Copilot

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Tools

GraphQL

Kafka

Kubernetes

Elixir

Ruby

TypeScript

gRPC

GitHub Copilot

Cursor

Job description

Fresha, the leading marketplace platform for beauty and wellness, seeks a Senior Backend Engineer based in London (Old Street) onsite four days a week, with remote Wednesdays. You will build scalable Ruby/Elixir code and collaborate across product, design, frontend, and infra teams to ship features end-to-end.

In this role, you’ll operate in a polyglot stack (Ruby, Elixir, GraphQL, TypeScript, gRPC) with Kafka and Kubernetes, embracing Domain-Driven Design to deliver high-impact product outcomes