Senior Backend Developer Leiria

Overview

Hey, we’re BRAINR. At BRAINR, we’re reshaping how food factories operate. We’ve built a
- generation, AI-powered cloud MES (Manufacturing Execution System), and we’re growing fast - powered by a €11M Seed Round. Our platform helps food manufacturers manage everything from raw material reception to production planning, warehouse operations, and dispatch, with custom quality control and full traceability. BRAINR connects people, machines, and sensors so that critical decisions can be made in real time - smarter, faster, and with greater impact.

The challenge

We’re looking for a Senior Backend Developer to join our team. You’ll work on features that directly impact our customers, designing and evolving backend services that ensure reliability, performance, and scalability. In this role, you won’t just be building APIs or optimizing systems, you’ll be collaborating closely with product managers, frontend developers, and designers to deliver
-
- end solutions that bring measurable value to food manufacturers using our platform. This is a chance to have real ownership, influence technical decisions, and shape how our MES product grows at scale.

Key Responsibilities

• Design, develop, and maintain backend services in C# (. NET Core).
• Implement and consume REST APIs to ensure seamless integration across systems.
• Optimize performance, scalability, and security of
  - based solutions.
• Collaborate with
  - functional teams (product, frontend, design, QA) to deliver features
  -
  - end.
• Apply software design principles (SOLID, DRY) and modern architectures (Domain-Driven, Event-Driven).
• Contribute to improving our engineering practices, code quality, and technical documentation.
• Stay up to date with industry trends and bring innovative ideas to the team.

Minimum Requirements

What we’re looking for

• 5+ years of professional experience as a Backend Developer.
• Strong expertise in C# (10 or higher) and. NET Core (8 or higher).
• Experience building and maintaining RESTful APIs with ASP. NET Core.
• Knowledge of cloud environments (Azure or AWS) and monitoring tools.
• Solid understanding of OOP, software design principles, and distributed systems.
• Familiarity with
  - driven architectures and messaging systems is a plus.
• Proactive,
  - solving mindset with attention to performance and security.
• Excellent English, both written and spoken.

Where we work

We work
- site, from our headquarters in Leiria. We believe in the power of being together - especially when building something this ambitious.

Why BRAINR?

Benefits

• Enjoy an extra 2 days of paid time off.
• Savings with corporate discounts through partnerships and special offers.
• Learning and Development Program.
• Work with the latest AI tools and
  -
  - class tech stack.
• Team-building activities at least twice per year.
• Flexible working hours that fit your routine.
• On-site gym facility.
• Free lunch in our office restaurant every day.

Our hiring process

• Application review
• Intro call with our People team (30 min)
• Technical assessment
• Technical interview
• Final chat with team members or leadership