Senior Backend Engineer, AI Platform (100% remote-friendly within Spain)

Docplanner Tech; Barcelona; A distancia; EUR 50.000 - 80.000; Jornada completa

Descripción de la vacante

A tech company specializing in AI is seeking a Senior Backend Engineer to design and maintain scalable AI infrastructure. The role requires a strong background in software engineering, particularly in Python and C#. The company offers a flexible working environment, private healthcare, and a commitment to equal opportunities. You will work in a dynamic team to keep up with rapidly changing AI technologies.

Servicios

Private healthcare plan

Flexible working hours

Remote or hybrid work model

Access to gyms

Free English classes

23 paid holidays

Formación

• Strong background in software engineering is required.
• Experience with distributed systems at scale is advantageous.
• Familiarity with AI/ML tools will be beneficial.

Responsabilidades

• Design and implement scalable systems for AI Agents.
• Ensure the reliability and security of AI infrastructure.
• Build tools for product teams across Docplanner.

Conocimientos

Strong software engineering background (Python + C#)

Exposure to distributed systems

Experience building ML/LLM solutions

Understanding of software architecture best practices

Familiarity with data pipelines and prompt engineering

Growth mindset

English fluency (B2+)

Herramientas

C#

Python

PHP

Java

ML/AI tools (LangChain, LlamaIndex)

Cloud platforms (GCP, AWS, Azure)

Descripción del empleo

Job Description

Area of Work

We’re laying the groundwork for the future of AI at Docplanner – scalable systems, multi-agent architecture, MCP servers and seamless integration into our products. We’re looking for a Senior Backend Engineer with a strong Software Engineering background and AI Engineering experience to join our team.

The AI Platform team is a part of the Internal Platform area and nowadays consists of 2 Platform Engineers and 2 Software Engineers. As AI needs are growing, we are intensely growing that team to be “The Magnificent Seven”.

The team is accountable for 2 main objectives :

• Designing, building and maintaining the company's AI infrastructure. Ensuring high availability, scalability, security and cost efficiency.
• Adopt new technologies like MCP and A2A.

What are the challenges in the team?

Dynamic environment with rapid changes. Both AI technology and business around it are changing super fast, and we need to keep up with our goals. For example, OpenAI announcing Apps SDK changed our quarter goals.

Working with different technologies. Main backend technologies are C# and .NET, but for many AI projects we are using Python. All of that is connected with a big distributed system with multiple services.

What you’ll do

• Design and implement scalable systems for AI Agents, MCP, and emerging architectures.
• Adopt new technologies coming up with AI.
• Build tools that empower product teams across Docplanner.
• Ensure reliability security, and cost efficiency of AI infrastructure.
• Work cross-functionally to accelerate AI adoption in our products.

Qualifications

• Strong software engineering background (Python + C#, PHP, or Java experience).
• Exposure to distributed systems and managing services at scale.
• Experience building or deploying ML / LLM solutions (e.g., fine-tuning, RAG pipelines, model evaluation, production APIs).
• Understanding of software architecture and engineering best practices (REST, SOLID, GRASP, GIT, CI / CD, DDD, TDD, Clean, Agile, etc).
• Familiarity with data pipelines, model orchestration, and prompt engineering.
• Growth mindset and comfort in a fast-changing environment.
• English fluency (B2+).

Nice to have

• Experience with AI / ML tools (LangChain, LlamaIndex, etc.).
• Knowledge of RAG pipelines and MLOps practices.
• Cloud platform expertise (GCP, AWS, Azure).
• Exposure to other OOP stacks (.NET, PHP).

Nobody ticks all those boxes above, but willingness to learn is strongly valued here!

Additional Information

Compensation structure

• A salary adequate to your experience and skills.
• Flexible remuneration and benefits system via Flexoh, which includes: restaurant card, transportation card, kindergarten, and training tax savings.
• options plan after 6 months of working with us.

True flexibility and work-life balance

• Remote or hybrid work model with our hub in Barcelona;
• Flexible working hours (fully flexible, as in most cases you only have to be on a couple of meetings weekly);
• Summer intensive schedule during July and August (work 7 hours, finish earlier);
• 23 paid holidays, with exchangeable local bank holidays;
• Additional paid holiday on your birthday or work anniversary (you choose what you want to celebrate).

Health comes first

• Private healthcare plan with Adeslas for you and subsidized for your family (medical and dental).
• Access to hundreds of gyms for a symbolic fee in partnership for you and your family with Wellhub.
• Access to iFeel, a technological platform for mental wellness offering online psychological support and counseling.

Keep growing with us

• Free English classes.

We promote and embrace equal opportunities in our hiring process, and also every day at work. When you apply for our roles you receive equal treatment regardless of age, disabilities, gender reassignment, marital or civil partner status, pregnancy or parental status, race, color, nationality, ethnic or national origin, religion or belief, sex, sexual orientation or any other dimension of human difference. If you require additional support in your recruitment process, we kindly encourage you to let us know. Behind those words you’re reading, there’s a person who already helped a candidate by adapting the interviews, and now we’re lucky to have this person with us. So, even if you’ve never asked for it before, may this serve as a sign that, now, you can do so. We can only truly be equal if we adapt to each other.

“We believe all humans, in all their beautiful diversity, should have equal rights, dignity and respect. Period.” – Mariusz Gralewski, CEO