Senior Full Stack Web Engineer - Crypto

Keyrock – Rotterdam, South Holland, Netherlands Keyrock is a leading change‑maker in the digital asset space, known for partnerships and innovation. Today we have over 200 team members across 42 nationalities, with hubs in London, Brussels, Singapore and Paris, and we work largely remotely. Our services span market making, options trading, high‑frequency trading, OTC, and DeFi trading desks as well as digital asset management.

Full Stack Web Engineer We are seeking a Full Stack Web Engineer with strong UI/UX sense and a proven track record in the financial services industry. Experience in the crypto or digital asset domain is highly valued. You will work across the entire technology stack – from data models and APIs to interactive, high‑performance interfaces – building and refining products that deliver tangible business value. You are driven by a product mindset, validate ideas early, and evolve them from functional to exceptional. Language‑agnostic and pragmatic, you experiment when it serves the end user. You excel in collaborative environments, take ownership, and contribute to a culture of technical excellence through reviews, mentorship and shared learning.

Job Description

Deliver end‑to‑end product features – from backend APIs and data models to engaging, responsive UI components.

Review and validate scalable software architectures, ensuring maintainability, reliability, and secure integrations across all layers.

Champion good engineering practices, including code reviews, automated testing, documentation and CI/CD workflows.

Optimise performance across the stack through effective debugging, profiling and system tuning.

Collaborate with product and engineering teams to translate complex business and user requirements into elegant, performant solutions.

Maintain consistent operational hygiene through clear documentation, smooth migrations and predictable deployments.

Explore and share emerging technologies, with particular interest in Rust, WebAssembly and modern API frameworks.

Background and Experience

Proven experience building full‑stack web applications with strong command of both frontend and backend principles.

Proficiency in modern frontend frameworks (Vue, React or similar) and design systems or component libraries such as Shadcn.

Experience developing robust backend services, ideally using Rust or familiarity with typed backend languages.

Solid understanding of HTTP, RESTful API design and performance optimisation in web contexts.

Hands‑on experience with relational and/or NoSQL databases, schema design and query optimisation.

Familiarity with Git‑based workflows, continuous integration and automated testing practices.

Strong debugging, problem‑solving and analytical skill.

A product‑oriented mindset – balancing quality, speed and user impact effectively.

Excellent collaboration and communication skills, with a proactive attitude toward improving systems and team dynamics.

Preferred Qualifications

Exposure to data‑intensive, governance‑driven or fintech/crypto applications and curiosity for Rust or distributed systems.

Awareness of secure coding practices, authentication/authorisation models (OAuth2, OpenID Connect).

Knowledge of data visualisation libraries (D3.js, Recharts or similar).

Familiarity with observability stacks (Grafana, Prometheus, Loki, Faro or Datadog) and comfort instrumenting metrics, logs and traces.

Ability to design applications with self‑observability in mind (e.g., health endpoints, tracing IDs, telemetry propagation).

Exposure to Kubernetes, containerised environments and Helm‑based deployments.

Understanding of CI/CD pipelines (GitLab CI) and infrastructure‑as‑code workflows.

Experience working in cloud‑native environments (AWS, GCP or Azure) and awareness of security‑first design.

Comfort working with financial datasets, trade logs or analytics dashboards.

Experience handling sensitive or regulated data, ideally in financial or crypto contexts.

Our Offer

A competitive salary package.

Autonomy in your time management thanks to flexible working hours and the opportunity to work remotely.

The freedom to create your own entrepreneurial experience by being part of a team of people in search of excellence.

As an employer we are committed to building a positive and collaborative work environment. We welcome employees of all backgrounds, and hire, reward and promote entirely based on merit and performance.

Due to the nature of our business and external requirements, we perform background checks on all potential employees; passing these checks is a prerequisite to join Keyrock.

For more information visit https://keyrock.com/careers/

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