Founding Full Stack Engineer

Blu Selection; Barcelona; Híbrido; EUR 50.000 - 70.000; Jornada completa

Descripción de la vacante

A new AI-native startup in Barcelona is seeking a Founding Full-Stack Software Engineer to build core product features for the biopharma industry. Candidates should have 4–6 years of software engineering experience with strong backend skills in Python and proficiency in React, Next.js, and TypeScript. The role offers the opportunity to shape the product from day one in a hybrid work environment with a strong preference for onsite collaboration.

Servicios

Gym membership

Opportunity to shape product from day one

Collaborative culture valuing in-person interactions

Formación

• 4–6 years of software engineering experience (mid to senior level).
• Experience building data-heavy or versioned backend systems.
• Valid Spain work permit (no sponsorship available).

Responsabilidades

• Architect scalable, auditable backend systems.
• Build APIs enabling seamless collaboration between humans and AI agents.
• Develop clean, modular frontend interfaces using React, Next.js, and TypeScript.

Conocimientos

Strong backend engineering skills with Python

Proficiency in React

Proficiency in Next.js

Proficiency in TypeScript

Educación

Engineering degree

PhD

Herramientas

PostgreSQL

Node.js

Descripción del empleo

Job Title:

Founding Full-Stack Software Engineer – AI for Biopharma

Location:

Barcelona, Spain

Employment Type:

Full-time

Compensation & Benefits:

• From €70,000
• Gym membership
• Hybrid model, but with regular onsite collaboration strongly preferred

About the Company:

Equator is a newly founded AI-native startup building next-generation software for the biopharma industry. Their mission is to solve one of the sector’s biggest challenges: knowledge management across scientific, commercial, and operational teams.

Equator’s platform uses AI agents, knowledge graphs, and structured data systems to help biopharma organizations understand, compare, and act on their internal information. The result is a smarter, more proactive way for teams to collaborate and make decisions.

This is an early-stage, senior, fast-moving environment where you’ll help shape the product, architecture, and engineering culture from the very beginning.

Job Summary:

As a Founding Full-Stack Engineer, you will build core product features end-to-end across backend and frontend. You will collaborate directly with the founders and play a key role in designing the technical foundation for an AI-native product serving complex biopharma workflows.

Key Responsibilities:

• 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

Required Qualifications:

• 4–6 years of software engineering experience (mid to senior level)
• Strong backend engineering skills withPython
• 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)

Nice-to-Have Skills:

• Experience with AI agents or LLM-native applications
• Knowledge of Supabase, Postgres, RLS, versioning systems
• Familiarity with Radix, Tailwind, shadcn/ui, Inngest, Modal, Zod
• Engineering degree; PhD is a plus
• Background in life sciences, biopharma, or complex scientific domains

What Equator Offers:

• Opportunity to join as one of the first engineers and shape the product from day one
• High-impact work solving real problems for biopharma teams
• A collaborative culture that values in-person interaction
• Hybrid model with strong preference for onsite work in the Barcelona office