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Backend Software Engineer

Hybrid in Barcelona·Added 2 months ago (last checked 8 Oct)

Fourthline

2 open roles

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Overview

Work mode: Hybrid, Barcelona
English: Required
Experience: 3+ years

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Skills

Requirements

What we're looking for

Minimum 3 years software development experience in one or more general-purpose programming languages.
Good knowledge of.NET 5-8, or.NET Core 3.x
Proficiency in C# (version 10 or later).
Experience in unit and integration testing with XUnit (MSTest/NUnit are a plus).
Familiarity with ORMs (EF Core) and knowledge of Linq.
Experience implementing REST APIs using.NET Web API.
Understanding of SOLID principles and Domain-Driven Design (DDD).
Knowledge of common software design patterns.
Experience with Git and CI/CD in Azure DevOps.
Experience with cloud providers such as AWS and Azure; experience with EKS and Terraform is highly valued.
Ability to work on-site at our fantastic office in Barcelona at least 3 days a week as per our Hybrid Working Policy.
Language skills: English full professional proficiency.

Pay & benefits

What you'll get

At Fourthline, we offer opportunities for learning and development, allowing you to work alongside and learn from experienced engineers. As you grow within our team, there are possibilities to grow to Senior Engineer and further (we have Staff Engineer level and beyond), with clear pathways to further your technical, problem solving and communication competencies, as well as build your knowledge of the FinTech industry.

The role

At Fourthline, our mission is to fight financial crime. We help protect the global financial system by verifying millions of identities for banks, neobanks, online brokers, crypto exchanges, and insurers like N26, Trade Republic, flatexDEGIRO, Nationale Nederlanden, Qonto, Shine, Solarisbank, and more.

Prevent financial crime by building best-in-class SaaS solutions with our talented Anti-Money Laundering (AML) and Bank Account Verification (BAV) + Qualified Electronic Signatures (QES) teams in Barcelona-we're looking for a Backend Software Engineer II who brings solid technical expertise, a product-driven mindset, and a collaborative spirit across diverse domains and skill levels.

What you'll do

As a backend engineer at Fourthline, you will:

Design, develop, maintain, and improve our microservices, and take responsibility for thorough testing and reliable deployments of your stories.
Professionally manage your tasks, priorities and deliverables, taking joint ownership with your teammates for the sprint goals.
Utilize your experience to contribute to our growth through lessons learned from your successes and failures.
Take responsibility for engineering excellence and participate in architectural decision-making within your team.
Contribute to thorough documentation-crucial for ensuring success and minimizing questions!
Understand the entire development lifecycle and work closely with other members in squads, including Platform and QA teams.
Employ both technical and soft skills to address challenges, recognizing that solutions often require a blend of technology-based and people-based strategies.

Our Stack

.NET 5-8 - Our cloud-based microservices architecture includes REST APIs, Docker, Message Queues (RabbitMQ), RDBMS (PostgreSQL), Wolverine, Marten (Doc + Event stores), and much more!

About Fourthline

Fourthline is a fintech company specializing in digital identity verification and compliance solutions. It provides AI-powered KYC (Know Your Customer) and AML (Anti-Money Laundering) services to financial institutions and other regulated businesses across Europe. Founded in Amsterdam, the company has grown to serve clients in multiple countries, offering a platform that combines advanced technology with human review to ensure secure and efficient onboarding processes.

In Spain, Fourthline has established a presence to support its growing client base and engineering operations. The company is known for a collaborative and innovative work culture, with a focus on engineering excellence and regulatory compliance. For international professionals, Fourthline offers the opportunity to work in a dynamic fintech environment with a diverse team, and the roles in Spain are part of its broader European expansion.

Industry: Fintech
Founded: 2015
Employees: 100–500
Headquarters: Amsterdam, Netherlands
In Spain: Madrid

Good to know if you are moving

Fourthline is headquartered in Amsterdam, but has a growing presence in Spain, offering opportunities for international professionals to work in a multicultural environment.
The company focuses on fintech and compliance, which is a high-demand sector in Spain, especially in Madrid and Barcelona.
Fourthline's roles in Spain are primarily in engineering and solutions delivery, indicating a strong technical team.
As a scale-up, Fourthline offers the potential for career growth and impact in a fast-paced environment.
The company's clients are major European banks and financial institutions, providing exposure to high-profile projects.

In their own words

About the company & team

Having started our journey in January 2018, we're incredibly proud to count around 250 employees between our Amsterdam and Barcelona offices with over 50 nationalities.

At Fourthline, we foster a collaborative culture informed by industry knowledge (FinTech) and deep understanding of our business objectives. You will actively participate in chapter meetings, knowledge sharing sessions and cross-discipline alignments with other teams and engineering disciplines.

Additional information

At Fourthline, we believe diversity enriches our culture and inspires you to do your best work. We value your unique talents and perspectives, welcoming them into a safe and inclusive working environment, to ultimately deliver the best products to our customers and society. You're welcome here. Fourthline is for everyone.

Our hiring process is designed to be equal, fair, and transparent. We welcome people from all backgrounds, ethnicities, genders, sexual orientations, ages, abilities, religions, and experiences in life. If you're excited about this role, but your experience does not align perfectly with every qualification in the job description, we encourage you to apply anyways. You may just be the right candidate for this or other roles.

All open roles at Fourthline