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Weekday AI (YC W21)

Founding backend Engineer

Weekday AI (YC W21)
United Kingdom · Full-time · Mid-Senior
This role is for one of the Weekday's clients

Min Experience: 4 years

Location: London

JobType: full-time

We are looking for a Founding Backend Engineer to help build and scale core product capabilities from the ground up. This role offers end-to-end ownership, close collaboration with customers, and the opportunity to shape foundational architecture while moving quickly in a fast-paced environment.

Requirements

Key Responsibilities

  • Design, build, and ship core backend and platform features using Python, TypeScript, cloud infrastructure, and event-driven architectures
  • Own features end to end—from understanding customer needs and scoping solutions to delivery and iteration
  • Balance rapid experimentation with long-term scalability, knowing when to prototype quickly and when to engineer for durability
  • Establish and uphold best practices for testing, documentation, reliability, security, and performance
  • Work closely with product, customers, and early team members to deliver measurable outcomes

Ideal Candidate Profile

  • Strong customer focus, building systems with real-world impact and user success in mind
  • Action-oriented mindset with a willingness to experiment, learn quickly, and iterate
  • High sense of ownership and accountability, driving outcomes rather than just tasks
  • Ambitious and curious, excited to explore new technologies, domains, and markets
  • Collaborative team player who contributes wherever needed and supports overall team success
  • Quality-driven engineer with a commitment to continuously improving systems and code

Required Skills & Experience

  • Solid software engineering fundamentals with the ability to design, debug, and scale reliable backend systems
  • Proficiency in Python or TypeScript, with the ability to quickly learn new technologies as required
  • Experience building and shipping AI-enabled products, whether in startups, side projects, or large-scale systems
  • Comfortable working across backend services, APIs, data pipelines, and cloud infrastructure
  • Ability to collaborate with stakeholders to define scope, manage trade-offs, and deliver solutions
  • Demonstrated initiative through independent projects, open-source contributions, or early-stage product development

Key Skills

Ranked by relevance

typescript python cloud ai
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Country Guide

United Kingdom

Global English-speaking job market

Posted
Jan 20, 2026
Type
Full-time
Level
Mid-Senior
Location
London
Company
Weekday AI (YC W21)

Industries

IT Services IT Consulting

Categories

Other

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