Senior Full Stack Web Engineer

Senior Full Stack Web Engineer - Crypto Keyrock, Brussels Region, Belgium (Brussels) Join Keyrock, a leading digital asset company founded in 2017 that specializes in market making, options trading, high‑frequency trading, OTC, and DeFi. With over 200 team members across 42 nationalities, Keyrock is a forward‑thinking, growth‑oriented full‑service financial institution. We pioneer the use of Rust for algorithmic trading and support Web3 startups through our Accelerator Program. Mission We’re looking for a Full Stack Web Engineer who excels at UI/UX design and has proven experience in the financial services or crypto domain. The role spans data models, APIs, and high‑performance interfaces. You’ll bring a product‑mindset, validate ideas early, and iterate from functional to exceptional while staying language‑agnostic and pragmatic. Responsibilities Deliver end‑to‑end product features – backend APIs, data models, and interactive, 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. Optimize performance across the stack through 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 front‑end and back‑end principles. Proficiency in modern front‑end frameworks (Vue, React or similar) and design systems or component libraries such as Shadcn. Experience developing robust back‑end 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 skills. 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; curiosity for Rust or distributed systems. Awareness of secure coding practices, authentication/authorization 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 (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 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 high‑performance team. We value self‑awareness and powerful communication skills in our recruitment process. We seek fiercely passionate people who understand themselves and their career goals. We want a crypto enthusiast who’s driven, collaborative, acts with ownership, and delivers scalable outcomes. 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 which is a prerequisite to join Keyrock. Learn more at #J-18808-Ljbffr