Company
Founded by CPAs, tax attorneys, and engineers, Taxbit is the leading innovator automating global tax reporting for the digital economy. Taxbit's AI-enabled platform streamlines compliance related to digital assets, payments, and other financial transactions. Its unique combination of deep subject matter expertise and AI-forward technology have made it a fast-growing disruptor trusted by the world's leading fintechs, marketplaces, digital asset players, Big 4 accounting firms, traditional enterprises, and government agencies. Taxbit is seeking a Cloud Security Engineer to be a critical partner in securing and scaling our cloud infrastructure. This role combines hands-on security engineering with close collaboration across engineering, product, and customer-facing teams—ideal for someone who thrives at the intersection of security, software, and real-world impact. You will work directly with engineering teams to design secure AWS architectures, build scalable security tooling, and embed security into the development lifecycle. You will act as a trusted advisor, helping teams navigate challenges from infrastructure hardening to application security and threat modeling. You will also build and evolve core security capabilities, including cloud-native security systems, automated detection and response, and scalable platform improvements that strengthen our overall security posture.
We welcome individuals who are humble, hungry, and excited to tackle some of the industry's biggest challenges at the intersection of cloud infrastructure and security! Help us build the future of AI-powered compliance, automation, and operational excellence in an industry where precision matters.
Candidates must be legally authorized to work in Spain or another European Union country without company-sponsored visa support (e.g., holders of a valid Residency and Work Visa or Permanent Resident status).
Security Engineering




Partner closely with engineering teams to design secure, scalable AWS architectures and services.
Work directly with customers and internal stakeholders on real-world deployment scenarios across AWS and other cloud environments, designing and implementing secure solutions tailored to their infrastructure.
Act as a trusted security advisor throughout the software development lifecycle—from design to deployment.
Collaborate with developers to implement secure coding practices and application security controls.
Design, build, and operate cloud-native security infrastructure across AWS environments.
Develop automated security controls, detection mechanisms, and response capabilities.
Build and maintain Infrastructure-as-Code (Terraform or AWS CDK) to enforce secure configurations at scale.
Define and implement systems that generate high-quality security signals for threat detection and response.
Own security problems end-to-end, from identifying gaps to delivering production-ready solutions.
Contribute to DevSecOps practices by integrating security into CI/CD pipelines and developer workflows.
Continuously improve security standards, engineering practices, and system reliability.
Security Strategy & Enablement
Serve as the voice of security across engineering, translating risks into actionable engineering work.
Drive improvements in cloud security posture, including identity, network, and data protection.
Educate and mentor engineers on secure design principles, threat modeling,



and cloud security best practices.
Help shape the security roadmap by leveraging insights from real-world engineering challenges.
Fluent in English; Proven track record of identifying opportunities to build, test, and scale AI-powered solutions.
~ Sees AI as a force multiplier and actively looks for ways to enhance team performance through innovation & curiosity.
~5+ years of professional experience in software engineering or security engineering.
~ Strong programming skills, with proficiency in Python.
~ Hands-on experience with AWS cloud infrastructure and security.
~ Experience with Infrastructure-as-Code (Terraform, AWS CDK, or similar).
~ Proven experience conducting threat modeling and working on application security.
~ Ability to work autonomously in a fast-paced, distributed environment with minimal supervision.
~ Bachelor’s degree in Computer Science or equivalent.

Deep experience with AWS services (IAM, VPC, EC2, S3, Lambda, etc.).
Experience building security tooling, automation, and detection systems.
Familiarity with logging, monitoring, and security analytics platforms.
Knowledge of modern application security practices.
Thrives in an agile, fast-paced environment.
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Taxbit Wins the Digital Banker’s 2025 Digital Assets Award for Best Technology Solution Provider for Digital Assets - Tax & Compliance Automation
Taxbit Appoints Former OECD Advisor Colby Mangels as Global Head of Government Solutions
Unlocking Compliance at Scale: CARF/DAC8 Reporting for Digital Asset Platforms
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📌 Cloud Security Engineer - AWS (Madrid)
🏢 Taxbit
📍 Madrid