Senior Software Engineer

Interested in revolutionizing cybersecurity and crafting resilient APIs?

Join Hadrian as we expand into the Americas and be part of shaping the future of automated offensive security

Who are we:

We are Hadrian - an offensive cybersecurity startup. We are reshaping the future of cybersecurity through the power of agentic AI injected with the hacker’s perspective. Founded in August 2021, we've secured funding and the backing of ABN AMRO Ventures and Cherry Ventures, propelling us into a new era.

Our goal is to provide companies with an autonomous Threat Exposure Management platform. At Hadrian, we view security through a hacker's eyes because, well, hackers understand hackers best. We continuously map the digital footprint of organizations, discover risks, and prioritize remediation for security teams to harden their external attack surfaces.

Located in Amsterdam's buzzing Leidseplein and by London's famous Paddington Station, our diverse team from 25+ countries is on a mission to shake things up in offensive security. Join us in making waves and securing over 200 businesses, and be at the forefront of automated offensive security.

Your role:

At Hadrian, we're building advanced cybersecurity technology that helps organizations stay secure in an ever-changing digital landscape. As a Senior Software Engineer on our team, you will play a key role in designing, building, and maintaining the APIs that power our customer-facing applications and internal hacker tooling.

In this position, you will be our first technical hire in LATAM, and you will be instrumental in supporting Hadrian's expansion into the Americas! That said, you will still primarily be a member of our Europe-based engineering team, working async-first and connecting live when office hours overlap to collaborate on feature design, architecture, and implementation details.

We're looking for someone to both contribute to new product features and help drive developer experience (DX) improvements across the engineering organization, improving our codebase and optimizing CI pipelines. Additionally, while your main domain will be our APIs, we always encourage engineers to understand and contribute to other domains within Hadrian's architecture.

Finally, as our first LATAM-based Senior Software Engineer, you will get to work independently and act as the technical point of contact for our US-based Customer Success and Sales teams during their office hours, helping troubleshoot platform issues, investigate cross-service bugs, and ensure smooth operation for our customers.

If you're a self-directed engineer who enjoys solving complex problems end-to-end and wants to help define the future of autonomous hacking, this role is for you!

What you will do as a Senior Software Engineer (.NET) at Hadrian:

Design, Build, and Deploy:

• Design, build, deploy and operate scalable, high-performance APIs that power Hadrian’s applications.
• Ensure systems are robust, efficient, and observable, meeting the reliability and performance expectations of our customers.
• Improve developer experience (DX) by refining our codebase, CI/CD pipelines, tooling, and workflows.

Collaborate and Support:

• Work asynchronously with Hadrian’s Europe-based engineering team, engaging during overlapping hours for technical discussions and alignment.
• During US hours, assist the Customer Success and Sales teams with technical investigations, debugging and resolving customer-impacting issues when needed.
• Debug complex, cross-system problems spanning databases, programming languages, services, and infrastructure.

Enhance and Maintain Distributed Systems:

• Develop and maintain Hadrian’s event-driven architecture to ensure scalability, reliability, and fault tolerance.
• Work with Kafka, PostgreSQL, and Kubernetes to support system resilience and performance.

Review and Improve Code:

• Review code across teams to maintain consistency, reliability, and technical quality.
• Provide constructive feedback and share knowledge to raise the overall engineering standard.

Mentor and Share Knowledge:

• Support and mentor less experienced engineers through design discussions, code reviews, and technical guidance.
• Contribute to a culture of shared ownership and continuous improvement.

You are fit for this job because you:

• Are proficient in C# and .NET Core, with strong experience building scalable backend services.
• Have experience with PostgreSQL (or other relational databases like MSSQL, MySQL) and writing SQL queries.
• Understand event-driven systems and have worked with Kafka or similar technologies.
• Are experienced with Kubernetes, Docker, and cloud environments (AWS, GCP, or Azure).
• Have 5+ years of relevant backend experience, and 7+ years of general software engineering experience.
• Excel at debugging complex event-driven microservice architectures and identifying root causes independently.
• Are skilled in building distributed event-driven systems.
• Have experience implementing API design best practices, including versioning, scaling, and documentation.
• Possess knowledge of testing tools for Unit, Integration, and End-to-End testing.
• Utilize Object-Relational Mapping (ORM) such as Entity Framework (EF) or similar technologies.
• Have experience in developing software for cloud platforms (AWS, GCP, Azure).
• Communicate clearly and effectively in English and are comfortable working remotely.
• Are highly independent and comfortable working asynchronously across time zones.

Bonus points if you have:

• Experience or strong interest in GoLang.
• Familiarity with ReactJS / NextJS and Typescript and you are able to fix frontend issues end-to-end when needed.
• Have prior experience working in remote, independent roles supporting global teams.
• A strong sense of ownership and curiosity to understand how the full Hadrian platform fits together — from APIs to infrastructure.

Our Stack:

• .NET Core (C#)
• GoLang
• TypeScript (React, Node)
• PostgreSQL
• Neo4j
• Kubernetes
• KNative
• Apache Kafka
• AWS

Benefits at Hadrian:

• Unlimited paid holiday
• Flexible working hours
• Stock options package
• Work-from-home budget
• Referral bonuses

Why you want to be part of Hadrian:

Make the internet safer: We enable companies to protect their customers, employees, and other stakeholders from malicious hackers by providing real-time Exposure Management from the Hacker’s perspective

Board a primed rocket ship: Hadrian is growing fast; the team is approaching 100 wonderful people, notable customers are signed, and significant funding is raised. Now is the time to join our high-growth journey

Be part of a strong and dynamic culture: Our values define who we are as a group and serve as the cornerstones to guide us in building a product that our customers love. At Hadrian, we achieve this by championing a culture that takes ownership, succeeds together, increases velocity, and pursues growth

Sounds like the role for you? Hit the apply button!

Our clients are seeking a world-class and reliable digital security service. That is exactly what we are offering. Therefore, a background check will be part of the process.