Senior Full-Stack Developer

InteractiveAI; Madrid; Híbrido; EUR 60.000 - 79.000; Jornada completa

Descripción de la vacante

A fast-growing startup is seeking a Senior Full-Stack Developer to build core features across both frontend and backend systems. The ideal candidate will have 5+ years of experience, proficiency in TypeScript and React, and a solid understanding of backend technologies and cloud services. The position offers a competitive salary and a hybrid work setup in Madrid.

Servicios

Competitive base salary ($70,000 / yr to $90,000 / yr) + performance bonuses

Access to equity/shares

Health & wellness allowances

Private health insurance

25 days of holidays / paid time off

Formación

• 5 years experience building and deploying full‑stack applications in production.
• Strong proficiency with TypeScript, JavaScript and modern frontend frameworks (React required).
• Backend experience with Python or similar server‑side technologies.
• Experience designing and consuming RESTful and GraphQL APIs.
• Hands‑on experience with Docker containers and Kubernetes deployments.

Responsabilidades

• Design and implement backend services and microservices.
• Build responsive frontend applications using React and TypeScript.
• Develop and maintain RESTful and GraphQL APIs.

Conocimientos

TypeScript

JavaScript

React

Python

Docker

Kubernetes

Postgres

Redis

ClickHouse

AWS

GCP

Azure

Educación

Bachelor's degree in Computer Science or related field

Descripción del empleo

What You’ll Do

As a Senior Full‑Stack Developer at InteractiveAI you will build core features across both the frontend and backend of our platform, shipping elegant interfaces, robust APIs, scalable services and reliable tooling used by enterprise customers and internal teams.

This is a hands‑on, high‑ownership engineering role: you will architect systems, write production‑grade code, design efficient data flows and ship end‑to‑end features that directly shape our product experience.

• Design, architect and implement backend services, microservices and internal tooling
• Build modern, responsive and performant frontend applications using React, TypeScript and Tailwind
• Develop and maintain RESTful and GraphQL APIs that power key platform functionalities
• Integrate third‑party services, authentication systems and enterprise connectors
• Collaborate with product and design to craft intuitive user experiences and smooth interaction flows
• Deploy and manage containerised applications using Docker and Kubernetes
• Work with databases such as Postgres, Redis and/or ClickHouse – handling schema design, migrations and query performance
• Implement and maintain CI/CD pipelines, testing frameworks and release workflows
• Troubleshoot production issues, performance problems and service reliability incidents
• Take full ownership of features from design to production, including documentation and monitoring

What We’re Looking For

We’re looking for a highly skilled engineer with strong full‑stack fundamentals, proven delivery experience and the ability to build elegant, scalable systems across the entire web stack.

Minimum Requirements

• 5 years experience building and deploying full‑stack applications in production
• Strong proficiency with TypeScript, JavaScript and modern frontend frameworks (React required)
• Backend experience with Python or similar server‑side technologies
• Experience designing and consuming RESTful and GraphQL APIs
• Hands‑on experience with Docker containers and Kubernetes deployments
• Strong understanding of relational and/or analytical databases (Postgres, Redis, ClickHouse)
• Experience working with cloud providers (AWS, GCP or Azure)
• Familiarity with Infrastructure‑as‑Code tools such as Terraform
• Solid grasp of CI/CD pipelines, automated testing and release management
• Excellent communication skills and ability to collaborate in cross‑functional teams

Nice‑to‑Haves

• Experience with multi‑tenant SaaS architectures or high‑throughput systems
• Experience with state‑management libraries (Zustand, Redux, Recoil)
• Familiarity with event‑driven architectures and message queues
• Exposure to enterprise security best practices (IAM, VPC, encryption)
• Contributions to open‑source or active involvement in tech communities

What You’ll Get

• Competitive base salary ($70,000 / yr to $90,000 / yr) + performance bonuses
• Access to equity/shares as the plan rolls out
• Health & wellness allowances
• Private health insurance
• Flexible work setup – travel when needed (ideally hybrid in Lisbon or Madrid)
• 25 days of holidays / paid time off (excluding local public holidays)

Who You Are

• Proactive & Resourceful – you identify problems early and drive solutions independently
• High‑Ownership – you treat the platform and codebase as your own and deliver high‑quality work consistently
• Execution‑Driven – you thrive in a fast‑paced startup environment and enjoy shipping user‑facing features
• Collaborative – you communicate clearly, engage well with product/design/engineering peers and mentor others when needed

Interview Process

We keep our process focused and respectful of your time. Most candidates complete it in 23 weeks. Here’s what to expect:

• Intro Call – 30 minutes to align on fit and expectations
• Take‑Home Challenge – a practical task based on real‑world engineering problems
• Technical Interview – deep dive into software architecture, system design and implementation skills
• Cultural & Values Interview – exploration of motivation, communication style and team alignment
• Offer – final conversation and offer

We’re forming a team of builders – people who care about impact, quality and growth. If that’s you, let’s talk.

About Us

InteractiveAI is a fast‑growing startup on a mission to empower enterprises with fully managed AI agent lifecycles.

We’re building the next generation of enterprise‑AI solutions, delivering an end‑to‑end Agenc­ic IDE alongside an extensible ecosystem of agentic resources and solutions.

Our platform allows companies to orchestrate, monitor, evaluate, deploy, and improve AI agents – and soon fine‑tune and own their own models.

We value autonomy, speed and innovation and are building a world‑class team to match. Our squads are lean, focused and execution‑driven.

If you thrive in high‑performance environments and want to be part of a company that rewards transformational outcomes, this is for you.

Key Skills

APIs, REST, Spring, SOAP, .NET, React, Node.js, Angular, J2EE, JavaScript, Web Services, Java

Employment Type

Full‑Time

Senior Independent Contributor (IC) Role

Senior IC