Senior Full-Stack Software Engineer - AI

Treatwell; España; Presencial; EUR 50.000 - 70.000; Jornada completa

Descripción de la vacante

A leading software company in Spain seeks a Senior Full-Stack Software Engineer to integrate AI into its products. You will design scalable services using Node.js and collaborate in a cross-functional Agile team. Candidates should have strong backend skills and experience with AI technologies. The role offers a dynamic work environment and 28 days of holiday.

Servicios

28 days holiday

Opportunity for professional growth

Formación

• Proven experience as a Software Engineer.
• Experience with AI services such as OpenAI or AWS Bedrock.
• Familiarity with TDD / BDD practices.

Responsabilidades

• Design, develop, and maintain scalable services and applications.
• Collaborate with stakeholders in an Agile environment.
• Integrate and maintain robust connections with third-party APIs.

Conocimientos

Experience with LangChain

Strong experience in back-end development with Node.js

Excellent problem-solving skills

Familiarity with cloud platforms like AWS

Herramientas

Node.js

React

AWS

Descripción del empleo

Overview

Senior Full-Stack Software Engineer - AI. We're looking for talented, friendly and adaptable Full-stack Software Engineers to help fast-track the integration of AI within our products, both for internal and external use. In this role, you'll join Treatwell's new AI Engineering team, where you'll design and build AI-powered, full-stack solutions—everything from internal automation to customer-facing features. Your core mission will be to integrate intelligence into our ecosystem (linking platforms like Salesforce, Hubspot, Confluence and our own products) to streamline internal workflows and elevate the experience for every Treatwell customer.

We are seeking a software engineer who is comfortable working in a cross-functional Agile team, with proven experience in designing / building frontend and backend applications, continuously delivering clean, maintainable and well tested code. We want to do great work and to be known for it.

As a full-stack engineer you will help the team to ensure they continuously deliver high quality code, so that they can meet and exceed their goals. You will collaborate with the other members of the team, contributing to build robust integrations with third party services.

You will help the team to define and roll out an AI adoption strategy. You will play a crucial role in exploring, evaluating and integrating LLM and AI services / methodologies, adopting and orchestrating them in the team's products.

We don’t just ship features, we’re building a Europe-wide platform & team, and know we need to do great work to succeed. To achieve this, we need passionate people who love being challenged, learning new things, and growing with their team.

Responsibilities

• Design, develop, and maintain scalable services and applications in Node.js (TypeScript). We are adaptable and not tightly coupled to a single language / eco-system, especially on the backend.
• Collaborate with stakeholders: product managers, designers, and other engineers in an Agile environment.
• Write clean, maintainable, and well-tested code following good engineering practices.
• Integrate and maintain robust connections with third-party APIs and services.
• Participate in code reviews, architectural decisions, and continuous improvement initiatives.
• Ensure performance, quality, and responsiveness of applications.
• Advocate for good UX, visual quality, and technical design to embed quality in the software development process.

About You

• Experience with LangChain, LLM orchestration, or building AI-powered features.
• Experience with AI services (e.g., OpenAI, Hugging Face, AWS Bedrock, vector databases).
• Proven experience as a Software Engineer.
• Strong experience in back-end development with Node.js or a similar JavaScript runtime.
• Experience with other languages / frameworks on the backend (e.g., Python, Java / SpringBoot) and on the frontend (React).
• Solid understanding of RESTful API design, OAuth, and integrating third-party APIs.
• Excellent problem-solving and communication skills.
• Familiarity with cloud platforms, especially AWS.

Nice To Have

• Experience with TDD / BDD and writing test suites (e.g., Jest, Cypress).
• Familiarity with agile methodologies and DevOps best practices.
• CI / CD pipeline experience (we use Gitlab CI / CD).

About Treatwell

Hi, we're Treatwell. We are a team of 700+ passionate people across Europe. We provide salon management software connected to Europe's leading bookings platform, working with over 50,000 salon partners across 13 countries, processing over 8 million bookings every month. We are on an exciting journey to digitally revolutionise the hair and beauty community.

We\'ll Treat You With

• 28 days holiday, plus