Senior Software Engineer

Location: Barcelona or Tarragona (Spain), or Munich or Neukirch (Bodenseekreis) (Germany) — office-based with flexibility for occasional remote work

Reporting line: VP Engineering

Languages: Fluent English (C1+), written and spoken, is our only language requirement. Spanish and German are helpful, but not required

Role summary

This is a hands-on, high-ownership role for a highly competent fullstack engineer, architect, and problem solver. You will design, build, and operate the highly available software platform that manages our globally-distributed network of IoT devices, and the web applications and APIs built on top of it.

We expect senior engineers to use AI tools to accelerate their work—not as a novelty, but as a core part of how they design, build, test, and ship.

Our core languages are .NET C# and Java. If you’re a top-notch engineer coming from another stack, we are language agnostic—we assume you’ll learn.

Our stack

• Backend: .NET C# and Java
• Database: PostgreSQL in scalable, high-availability clusters; Timescale for sharding
• Frontend: React, with responsive design
• Platform: Linux
• CI/CD Pipeline
• AI-assisted development across the engineering workflow

Key responsibilities

• Design, build, and operate highly available web applications.
• Build and evolve the high-availability platform managing our globally-distributed network of IoT devices.
• Create, publish, and support APIs that third parties use to integrate with our platform.
• Build a large number of diverse API integrations with the third parties we work with around the world.
• Modernize legacy Java and .NET services onto current versions and patterns.
• Architect solutions end-to-end and solve hard problems independently.
• Use AI tools to accelerate development, testing, and delivery.
• Collaborate effectively with colleagues and teams distributed globally.
• Be an active, effective participant in an agile scrum team.

What you bring (must-have)

• 7+ years of software engineering experience, with strong fullstack capability.
• A track record as a highly competent engineer, architect, and problem solver.
• Deep backend experience in C#/.NET or Java—or top-notch engineering skills in another language with the ability to pick ours up quickly.
• Experience with PostgreSQL, ideally in scalable, high-availability configurations.
• Frontend experience with React and responsive design.
• Comfort working on Linux.
• Experience creating, publishing, and supporting APIs for third-party integrators, and building integrations against diverse third-party APIs.
• Demonstrated use of AI tools to accelerate your engineering work.
• Independence in solving problems, and experience working with global teams.
• Fluent English (C1+), written and spoken.

Preferred (nice-to-have)

• Experience with Timescale or other time-series/sharded data architectures.
• Experience managing and automating integrations with a wide variety of third parties.
• Experience modernizing legacy systems onto current platforms.
• Background in IoT, mobility, smart city, SaaS, or infrastructure-adjacent products.

What we offer

• High-impact engineering role with direct influence on a globally deployed platform.
• Competitive compensation.
• Employee equity participation opportunities.
• Flexible working and a high-trust, direct feedback culture.

Diversity & inclusion

We’re committed to a diverse and inclusive workplace. Qualified applicants are considered without regard to age, gender, ethnicity, sexual orientation, disability, religion, or other protected characteristics.

Agency / recruiter notice

We do not accept speculative or unsolicited CVs from agencies or headhunters. Unsolicited CVs will be treated as our property and any associated agency terms will be considered null and void unless a written agreement is in place.