Senior Back-end Developer @ KeyTalk — Made in Europe, Scaling Globally

Location: Amersfoort (NL) — hybrid (1 day/week at the office)

Competitive compensation package include 25 vacation days + travel allowance (€0.23/km) + laptop & peripherals of choice

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Who We Are

At KeyTalk, we build trust, literally.

We are a Dutch scale-up with global ambitions, specializing in PKI Certificate Lifecycle Management (CLM)solutions. Our software automates certificate discovery, provisioning, and renewal across enterprise IT, OT, and IoT environments; both on-prem and in the cloud.

Our core DevOps team runs the backbone of our business. We operate lean, smart, and with deep technical pride. One day a week we meet at the Amersfoort office; the rest we work from wherever we perform best.

We are now expanding this core with a seasoned Back-end Developer who can help us evolve from “best-kept secret” to global contender.

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Your Mission

You will work hands-on on:

-  Modernizing our legacy C/C++ codebase while building new components in C# / ASP.NET

-  Integrating with cloud-native and enterprise ecosystems

-  Strengthening the security and scalability of our CLM platform

-  Bringing new features to life

-  Acting as a technical sparring partner on our developers and architecture team

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Who You Are

You’re a pragmatic, experienced engineer who thrives in small, high-performing teams.

You understand legacy systems and love breathing modern architecture into them. You don’t just code — you think in terms of security, maintainability, and robust design.

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What You Bring

-  A European passport

-  Preferably living in The Netherlands, but not required.

-  Willingness to work directly for us.

Must-Have Skills

-  Proficient in secure coding, code review, and automated testing

-  Strong in C/C++ (for legacy maintenance & extensions)

- Solid experience in C#, ASP.NET 

-  Proficient in SQL, multithreading, RESTful APIs

-  Experience with Docker, Kubernetes, and Ansible

-  Healthy interest in Entra ID / MS Graph and other Cloud based services integrations

Nice to Have

-  gRPC / Protobuf

-  .NET 8+ / C# 12+

-  MS Blazor

- Generative AI-assisted development

-  OpenSSL experience

-  Applied interest in post-quantum cryptography (QPC)

-  MySQL admin experience 

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Why Join KeyTalk

-  Impact: Your work will directly shape our core product and customer experience.

-  Autonomy: We trust developers to own their solutions — no micromanagement.

-  Tech depth: From PKI internals to modern web stacks — you’ll stay challenged.

-  Team: A small, sharp, highly technical crew that values quality and humor.

-  Growth: We’re scaling globally — and you’ll be part of that trajectory.

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Apply

Send your CV or LinkedIn profile to [email protected] 

• We’ll start with an informal technical conversation to see if there’s a mutual fit.
• Recruiters are not responded to