Senior Backend/Platform Engineer

Levvr; Rotterdam; On-site; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Competitive compensation

Remote-first culture

Team trips

Development budget

25 paid holidays per year

NS Business Card

Top-notch equipment

Job summary

Levvr is seeking a software engineer with 5+ years to join our fast-growing SaaS scaleup in a hybrid/remote role. You will build the backend platform and integrations that connect Levvr to customer systems, focusing on .NET/C# and scalable architecture.

You will own end-to-end backend features, design APIs, and lead the Azure-to-AWS migration while ensuring reliability, security, and cost-efficiency. Embrace a scale-up culture with hands-on ownership.

Qualifications

• End-to-end ownership of backend/platform features from design to production.
• Experience with enterprise applications where integration, security and reliability are non-negotiable.
• Strong production experience with SQL/NoSQL data stores and graph databases.

Responsibilities

• The backend platform and integration layer that connects levvr to customer systems and infrastructure.
• Designing, implementing, and hardening APIs, messaging flows, and deployment patterns.
• Leading Azure-to-AWS migration for scalability, reliability, security and cost-efficiency.
• Building core backend services in .NET/C#, with observability and maintainability.
• Defining workflows for AI in day-to-day engineering with guardrails and reviews.
• Improving release pipelines, monitoring and incident response including AI changes.

Skills

C#

Azure

AWS

Kafka

Graph databases

Neo4j

API design

Security

SOLID principles

Tools

Azure Service Bus

Docker

Job description

We are looking for a software engineer with 5+ years of experience to join us on this exciting journey.

Hybrid / Remote

Ervaring

5+ years

Join us to build the future of construction technology

The construction industry shapes the skylines we admire and the infrastructure we rely on. Yet too many projects still fall behind schedule and over budget because critical information is trapped in outdated systems.

At Levvr, we believe there’s a better way. By moving from document-driven work to data-driven collaboration, we create a foundation where knowledge builds over time, turning every project into a stepping stone toward a smarter, more sustainable construction industry. This shift unlocks true collaboration for engineering teams, reduces waste, accelerates delivery, and ensures that billions in public and private funds are invested in future-proof infrastructure rather than lost to inefficiency.

When you join us, you’re not just writing code, you’re helping build the foundation for faster, smarter, and more sustainable construction worldwide.

We are looking for a software engineer with 5+ years of experience to join us on this exciting journey. This is a role within a fast growing SaaS scaleup, so if you like a dynamic working environment and learn new things then this is the challenge for you.

You will be responsible for:

The backend platform and integration layer that connects levvr to customer systems and infrastructure.

Designing, implementing, and hardening APIs, messaging flows, and deployment patterns that support regulated and customer-specific environments.

Being a leader in technical work on our Azure-to-AWS migration and ensuring scalability, reliability, security, and cost-efficiency.

Building and maintaining core backend services in our .NET / C# stack, with a strong focus on robustness, observability, and maintainability.

Setting the standard for how we use AI in day-to-day engineering, designing the workflows, guardrails, and review practices that let us move faster without quietly lowering the bar on quality.

Improving our release pipeline, monitoring, and incident response so platform changes can be delivered safely and confidently, including where AI-assisted changes are involved.

What we are looking for:

We know this is a long list but hopefully something you're comfortable with:

You take end-to-end ownership of critical backend and platform features, from design through implementation to production rollout and monitoring.

You've built and operated enterprise applications where integration, security, and reliability are non-negotiable.

You have strong production experience with:

SQL and NoSQL data stores, and ideally some exposure to graph databases.

Messaging systems and patterns (e.g. Azure Service Bus, Kafka, event-driven architecture).

You've genuinely changed how you build software over the last couple of years, and you can talk concretely about it: what you automated, what you stopped doing by hand, what you tried that didn't work, and what it did to your throughput or defect rate.

You have a considered view on where AI-assisted development breaks down - and you design your workflow, tests, and review process accordingly rather than trusting output on faith.

You can apply sound architectural thinking, using appropriate design patterns and SOLID principles without over-engineering.

You are comfortable designing and evolving deployment architectures on Azure and/or AWS, and understand the trade-offs of different approaches.

You know how to build integrations and APIs that are robust, versionable, and easy to operate in customer environments.

You have experience improving observability (logging, metrics, tracing) and using it to drive reliability and performance work.

You communicate clearly in English and can align with both technical and non-technical stakeholders - including making the case for a new way of working to people who aren't yet convinced.

You can work closely with product managers and implementation teams to understand requirements, shape solutions, and ensure the platform delivers against timelines and constraints.

You are comfortable in a scale-up environment: you prefer ownership over strict processes and are willing to get hands-on to make things work.

Nice-to-haves

Experience designing or operating integration layers for B2B SaaS in regulated or complex enterprise environments.

Experience with AWS (in addition to Azure), including migrations or hybrid cloud setups.

Experience with Neo4j or other graph databases, and an interest in semantic/graph-based products.

Experience with CQRS, microservices, and event-driven architectures, and a pragmatic sense of when to apply them.

Experience with LLM integrations or AI infrastructure (e.g. building an "LLM bridge", prompt orchestration, agent workflows) as part of a shipped product.

You've introduced AI-assisted development practices to a team before - agentic coding, AI-assisted review, automated test generation, spec-driven workflows - and got adoption, not just interest.

Strong understanding of messaging patterns, idempotency, and resilience in distributed systems.

Why levvr?

We know that great talent is built, not just hired. That’s why we invest in our people:

• Competitive compensation package , including salary and participation in our employee equity plan.
• Remote-first culture, with the option to join us at our Rotterdam HQ.
• Two mid-year team trips with the whole crew to inspiring locations in Europe.
• Personal development budget for training, coaching, or courses.
• 25 paid holidays per year
• When based in NL: NS Business Card for public transport.
• Top-notch equipment (laptop, monitor, setup of your choice).

Our culture

We’re a diverse, international team that values ownership, curiosity, and continuous learning. At levvr, your ideas matter. We work with transparency and trust, and we believe that psychological safety and inclusivity are key to building both strong teams and great products.

Application Process

What will happen after your application?

Get in touch

After you apply we’ll review your application and get back in 3 business days

First interview

Time to get to know each other. We love to hear about your previous experiences and your motivation.

Assessment

We’ll provide you with an assement so we can evaluate your role specific competences. Afterwards we’ll discuss your work in an interview setting.

Founder interview

The final interview is to ensure cultural alignment and fit within the organisations values and ethos.

Offer

You get an amazing high-end offer and hope to welcome you on the team soon.