pyhrr0
SUMMARY
A computer scientist with an entrepreneurial mindset who greatly values: privacy, decentralisation and transparency. I have a strong tendency to identify, understand and communicate abstract concepts. I would be thrilled to work on anything that promotes my values.
EXPERIENCE
Pleio, DevOps Engineer 2024-04-01 — Present
  • Performed a migration of 300+ websites and associated state / dependencies to a new cluster.
  • Improved existing pipelines to enforce a proper development flow.
[Linux, Gitlab, Git, GitOps, CI/CD, Terraform, Kubernetes, OpenShift, Helm, Kustomize, FluxCD, Bash, Python, PostgreSQL, MySQL, Prometheus, Grafana, Elasticsearch, RabbitMQ, CNPG]
Nationale Nederlanden, DevOps Engineer 2024-05-01 — 2024-11-01
  • Managed AWS services & resources to ensure optimal performance and availability.
  • Developed & maintained CI/CD pipelines for Financial Risk application on AWS.
  • Ensured security and compliance of AWS environments by fixing and preventing vulnerabilities.
[Linux, Gitlab, Git, GitOps, CI/CD, EC2, S3, RDS, Lambda, EBS, EFS, KMS, IAM, Cloudformation, AWS, Packer, Terraform, Powershell, Bash, Python, PostgreSQL, MySQL]
VNG, Software Developer 2023-05-01 — 2024-04-01
  • Worked on two distributed systems dedicated to synthetic data generation.
  • Bootstrapped a cloud platform.
  • Built a Terraform provider dedicated to FSC & worked on Terraform modules.
  • Built a REST API dedicated to GDPR compliance.
[Rust, Golang, Python, Bash, PostgreSQL, Event Sourcing, NATS, GraphQL, Docker, Linux, Kubernetes, Azure, FluxCD, Kustomize, Gitlab, IaC, Tailscale, Headscale, Helm, Tekton, Matrix, Mattermost, OIDC, Authentik, Traefik, CNPG, Terraform, OpenAPI]
VNG, DevOps Engineer 2022-08-01 — 2024-01-01
  • Established a development cycle for Common Ground's software components.
  • Debugged issues and created / coordinated appropriate resolutions.
  • Ensured Common Ground's technical goals were met.
[Linux, Gitlab, Git, GitOps, CI/CD, Kubernetes, Azure, Helm, Terraform, FluxCD, Bash, Python, PostgreSQL, MySQL, Istio, Prometheus, Grafana, Jaeger]
Logius, Software Developer 2021-12-01 — 2022-08-01
  • Built microservices that make up the backend of an IaaS (Infrastructure as a Service) solution.
  • Worked on pipelines that are responsible for testing / building / deploying microservices.
[Linux, Gitlab, Git, CI/CD, Docker, Kubernetes, Helm, Infrastructure As Code, Python, Typescript, RabbitMQ, Vault, VMware, Cloud Director, Vsphere, BDD, TDD, Scrum]
Bitonic, DevOps Engineer 2018-01-01 — 2021-11-31
  • Established infrastructure dedicated to centralized user identity management.
  • Defined and conveyed a deployment strategy for company's in-house projects.
  • Facilitated companywide security controls.
  • Introduced multiple collaboration services.
[Ansible, Apache, CI/CD, Clair, Docker, ELK stack, Git, Grafana, Helm, IAM, IDS/IPS, IPsec, Infrastructure As Code, Kerberos, Kubernetes, LDAP, Linux, Nginx, OpenVAS, PKI, RHEL, SSO, Saltstack, TCP/IP, Ubuntu, Unix, Vagrant, pfSense
Bitonic, Software Developer 2018-01-01 — 2021-11-31
  • Worked on a high performance trade engine.
  • Worked on a portfolio manager.
  • Built multiple microservices dedicated to KYC controls.
  • Reversed a messaging service.
  • Built a messaging service gateway.
  • Introduced new functionality to company websites.
[AsyncIO, C++, CI/CD, Cryptography, DOM, Docker, ELK stack, GRPC, Git, Golang, HTTP, JQuery, JSON, Javascript, NFC, OpenSSL, PHP, PKI, PostgreSQL, Protobuf, Python, React, Rust, SQL, Scrum, Selenium, Websockets, XML, ZeroMQ]
ASML, Software Developer 2016-12-31 — 2017-12-31
  • Built a snapshotting service that improved resiliency.
[Linux, RHEL, Ubuntu, Debian, LVM, Python, Django, ClearCase, Git, CI/CD]
Sue B.V., Consultant 2013-11-30 — 2017-12-31
  • I mentored and coached trainees in their professional development.
  • Implemented improvements to internal systems, resulting in increased productivity and reduced costs.
  • Helped clients improve / maintain their infrastructure, by writing code, and administering their systems.
[Linux, OpenBSD, FreeBSD, SSL/TLS, PKI, Bash, PHP, Python, JSON, XML, SOAP, NoSQL, MySQL, JQuery, Git, Apache, Ansible, Docker, CI/CD, Grafana, ITIL, Scrum]
Liberty Global, Software Developer 2015-10-31 — 2016-06-30
  • Built a distributed system dedicated to email heuristics.
[Linux, Ubuntu, Golang, Javascript, JQuery, Pub/Sub, NATS, ZeroMQ, Redis, AsyncIO, JSON, SQL, NoSQL, MySQL, Cassandra, Scrum, ELK stack]
ASML, Software Developer 2014-07-31 — 2015-09-30
  • Built system primitives required by core library.
[C, Bash, Unix, RTOS, ClearCase, Git, Scrum]
Computest, System Administrator 2014-03-31 — 2014-06-30
  • Identified threats and responded accordingly.
  • Managed Certificate Authority.
  • Managed hosting infrastructure.
  • Offered support to customers.
Apache, Debian, FreeBSD, FreeBSD, IDS/IPS, ITIL, Linux, Nginx, OpenSSL, RHEL, SOC, Scrum, Ubuntu
BASF, Network Administrator 2013-12-31 — 2014-01-31
  • Offered support to customers.
  • Performed maintenance on networks that were dedicated to BASF's oil platforms.
[Linux, RHEL, Ubuntu, Debian, Cisco, IPsec, ITIL, Scrum]
ON2IT BV, Security Engineer 2011-09-30 — 2013-10-31
  • Identified threats and responded accordingly.
  • Implemented and maintained numerous IDS/IPS systems.
  • Designed / deployed / managed infrastructures for customers.
[Linux, RHEL, Ubuntu, Debian, Ruby, Bash, Python, Apache, TCP/IP, OSI model, IPsec, Palo Alto, Cisco, Brocade, ITIL, SOC]
EDUCATION
Life 1992-01-01 — Present
Books | E-zines | Blogs | CTFs | Wargames | Mailing lists 2000-01-01 — Present
  • pwnable.kr
  • HackThisSite
  • PlaidCTF
  • Phrack
  • Hacktic
  • root-me
  • Certified Secure
  • RuCTF
  • POC|GTFO
  • Full Disclosure
  • OverTheWire
  • DEFCON CTF
  • CSAW CTF
  • Paged Out!
  • Project Zero
University of Jerusalem: Nand2Tetris 2008-01-01 — 2009-01-01
  • Computer architecture
  • Compiler Construction
  • Operating Systems
OpenSecurityTraining: Secure Code Review 2007-10-01 — 2007-11-01
  • Anti-patterns
  • Common pitfalls
  • Risk assessment
OpenSecurityTraining: The Life of Binaries 2007-07-01 — 2007-10-01
  • Compilers
  • Memory protections
  • Binary file formats
  • Linking
Stanford University: Introduction to Computing Principles 2006-04-01 — 2006-07-01
  • Architecture
  • Logical expresions
  • Data structures
  • Boolean Logic
Palo Alto Networks
  • Accredited Configuration Engineer (ACE)
  • Palo Alto Certified Network Security Engineer (PCNSE)
Linux Professional Institute
  • Linux Professional Institute Certification 1 (LPIC-1)
  • Linux Professional Institute Certification 2 (LPIC-2)
Brocade
  • Brocade Certified Network Engineer (BCNE)
  • Brocade Certified Network Professional
EC-Council
  • Certified Ethical Hacker (CEH)
Novell
  • Certified Linux Administrator (CLA)
EXIN
  • Information Technology Infrastructure Library (ITIL)
SKILLS
Software Development (Advanced): Python, Rust, Golang, C, C++, Javascript, PHP, Ruby, Bash, HTTP, Websockets, GRPC, REST, GraphQL, AsyncIO, Protobuf, SQL, NoSQL, Pub/Sub, Cryptography
System Administration (Advanced): Linux, OpenBSD, FreeBSD, RTOS, Kerberos, LDAP, PKI, Docker, Vagrant, Ansible, Kubernetes, KVM, OpenVAS, IaC - Infrastructure as Code
Offensive Security (Intermediate): Binary exploitation, Web hacking, Reverse Engineering, Cryptography, Steganography
Network Administration (Intermediate): TCP/IP, OSI model, IP multicast, Palo Alto, Cisco, Brocade, IDS/IPS, IPsec, VPN
LANGUAGES
English (Native Speaker) , Dutch (Native Speaker)