Founding Full Stack Engineer Job at YC Work at a Startup (San Francisco)

Founding Full-Stack Software Engineer – AI for Biopharma

Founding Full-Stack Engineer role at Equator, an AI-native startup building next...

Location

Spain , Barcelona

Salary:

70000.00 EUR / Year

Blu Selection

Expiration Date

Until further notice

Requirements

4–6 years of software engineering experience (mid to senior level)
Strong backend engineering skills with Python
Proficiency in React, Next.js, TypeScript, Node.js
Experience building data-heavy or versioned backend systems
Strong clean-code discipline and architectural thinking
English (Advanced/C1+)
Valid Spain work permit (no sponsorship available)

Job Responsibility

Architect scalable, auditable backend systems (Python, PostgreSQL, modern frameworks)
Build APIs enabling seamless collaboration between humans and AI agents
Develop clean, modular frontend interfaces using React, Next.js, and TypeScript
Implement and maintain data-heavy systems and structured knowledge frameworks
Write clean, precise code and contribute to strong engineering standards
Collaborate closely with founders, designers, and early users to deliver impactful features
Influence product, technical direction, and architectural decisions as a founding engineer

What we offer

Gym membership

Fulltime

Senior Full Stack Software Engineer

Checkr Trust is seeking a Senior Full Stack Software Engineer to join their team...

Location

United States , San Francisco

Salary:

173000.00 - 215000.00 USD / Year

Checkr

Expiration Date

Until further notice

Requirements

BS/MS degree in either computer science or electrical engineering
have founded or held early roles at successful fast-paced startups
6+ years of full stack software development experience
advanced knowledge in Ruby (Ruby on Rails)/ Javascript (React), or similar languages/frameworks
amazing product sense
experimentation mindset
experience building scalable technical architecture that can scale to 10mm+ users

Job Responsibility

work closely with customers, engineers, and leaders to design, build, and launch new products
take full ownership of the entire process of developing end-to-end applications – from shaping the idea to delivering the finished application
build and improve APIs, including integrating with third-party services to expand what our products can do
embrace a customer-centric, product-first approach – partner directly with customer success, customers and stakeholders to better understand their needs and turn those into useful features
keep code reliable and easy to maintain with solid testing, thoughtful reviews, and good practices
run and measure product experiments, using what you learn to guide future development
building scalable APIs and asynchronous event-based architecture that can reliably handle very high traffic

What we offer

a fast-paced and collaborative environment
learning and development allowance
competitive compensation and opportunity for advancement
100% medical, dental, and vision coverage
up to 25K reimbursement for fertility, adoption, and parental planning services
flexible PTO policy
monthly wellness stipend, home office stipend
working at a startup within a startup
lunch four times a week
a commuter stipend

Fulltime

Founding DevOps Engineer

As a Founding Engineer with a DevOps focus, you will play a central role in buil...

Location

France , Paris

Salary:

60000.00 - 80000.00 EUR / Year

Blu Selection

Expiration Date

Until further notice

Requirements

Strong full-stack engineering background with a DevOps mindset
Hands-on expertise in cloud platforms (GCP ideal): deployments, infra, CI/CD
Proficient in TypeScript and Python
Experienced with React, Next.js, and FastAPI
Solid knowledge of PostgreSQL and Redis
Ability to design scalable systems and deliver production-grade code quickly
Comfortable using AI-assisted coding tools (Cursor, Claude Code, Copilot)
Thrives in fast-moving, ambiguous, 0→1 environments
Fluent in English (French is a plus)

Job Responsibility

Build fast, lightweight, and reliable front-end applications (React)
Develop backend services powering conversational and AI-driven experiences
Design and maintain scalable cloud infrastructure (preferably GCP)
Set up CI/CD pipelines, observability, monitoring, and infra-as-code
Optimize performance, reliability, and security across systems
Own core architectural decisions and enforce best engineering practices
Ensure code quality, stability, and scalability from the ground up
Collaborate closely with early users and customers to iterate quickly

Fulltime

Founding iOS Engineer

Babylist is looking for a Senior iOS Engineer to join our newest venture—a stand...

Location

United States , Needham

Salary:

180100.00 - 225082.00 USD / Year

Babylist

Expiration Date

Until further notice

Requirements

Strong understanding of software development principles, capabilities, and limitations of the iOS platform
Well-versed in the intricacies of iOS development and can navigate its unique features and constraints
8+ years of proven experience in iOS app development using Swift
Comfortable working with Swift and SwiftUI and have a deep understanding of syntax, features, and best practices
Familiar with Foundation, SwiftUI, CoreAnimation and other foundational Apple frameworks and patterns
Hands-on experience with SwiftUI, Previews, and rapid prototyping
Passion for building consumer-facing products and moving quickly in the zero-to-one of a new product
Experience with AI-driven software development practices and tools
Solid understanding of the Android ecosystem, with direct Android development experience being a plus
Comfortable and enthusiastic about working in an AI-forward environment where AI tools are part of daily operations

Job Responsibility

Conceptualize, design and develop our new standalone iOS app, taking ownership of the entire development lifecycle
Develop features and functionality, ensuring a seamless and delightful user experience
Collaborate closely with your designer and product manager to translate requirements into technical specifications and user-friendly interfaces
Transform concepts and designs into intuitive and visually appealing iOS app interfaces
Collaborate closely with a full-stack web engineer to align on architecture, API design, and more
Write clean, efficient, and maintainable code following industry best practices and coding standards
Employ various testing techniques, write unit tests, and leverage debugging tools to identify and address any issues or bugs
Collaborate effectively with team members, actively participating in discussions and brainstorming sessions
Contribute to feature ideation, and providing insights to the team

What we offer

Competitive salary with equity and bonus opportunities
Company-paid medical, dental, and vision insurance
Retirement savings plan with company matching and flexible spending accounts
Generous paid parental leave and PTO
Remote work stipend to set up your office
Perks for physical, mental, and emotional health, parenting, childcare, and financial planning

Fulltime

Founding Engineer

Founding Engineer (Full-Stack TypeScript) required at an early-stage AI start-up...

Location

United Kingdom , London

Salary:

70000.00 - 100000.00 GBP / Year

Oho Group Ltd

Expiration Date

Until further notice

Requirements

Full Stack Developer
product focussed Software Engineer with strong full-stack TypeScript experience
2-5 years of professional experience
comfortable owning features end-to-end, from concept to production
experienced using AI development tools (Cursor, Claude, etc.) in your workflow
thrives in early-stage environments with ambiguity and ownership
experience building or shipping 0→1 products
someone who knows they want to be a founder one day

Job Responsibility

Be Engineer #1 and have real ownership
Shape the technical foundations of the company
Work closely with founders in a fast-moving environment

What we offer

Competitive salary + meaningful equity

Fulltime