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

Nationale Nederlanden, DevOps Engineer 2024-05-01 — Present

Managed AWS services & resources to ensure optimal performance and availability.
Developed and 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, Bash, Python, PostgreSQL, MySQL]

Formatic BV, DevOps Engineer 2024-04-01 — 2024-07-01

Migrated workloads (and associated state) from one cluster to the other.
Improved existing pipelines to enforce a proper development flow.

[Linux, Gitlab, Git, GitOps, CI/CD, Kubernetes, OpenShift, Helm, FluxCD, Bash, Python, PostgreSQL, MySQL, Prometheus, Grafana]

VNG, Software Developer 2023-05-01 — 2024-04-01

Worked on two distributed systems dedicated to synthetic data generation.
Deployed required infrastructure.
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. [Linux, Kubernetes, Helm, Infrastructure As Code, Python, Typescript, RabbitMQ, Vault, VMware, Cloud Director, Vsphere, BDD, TDD, Scrum]
Worked on pipelines that are responsible for testing / building / deploying microservices. [Gitlab, Git, CI/CD, Docker]

Bitonic, System & Network Engineer 2018-01-01 — 2021-11-31

Established infrastructure dedicated to centralized user identity management. [Linux, RHEL, SSO, Kerberos, LDAP, PKI, IAM, Apache, Nginx, ELK stack]
Defined and conveyed a deployment strategy for company's in-house projects. [Linux, Ubuntu, Vagrant, Ansible, Helm, Infrastructure As Code, Saltstack, Docker, Kubernetes, Git, CI/CD]
Facilitated companywide security controls. [Unix, pfSense, OpenVAS, Clair, TCP/IP, IPsec, IDS/IPS, Grafana]
Introduced multiple collaboration services. [Linux, Debian, Ansible, Docker. Haproxy, RTP, SIP, MySQL, PostgreSQL, Grafana]

Bitonic, Software Developer 2018-01-01 — 2021-11-31

Worked on a high performance trade engine. [C++, Golang, Javascript, AsyncIO, ZeroMQ, Protobuf, SQL, PostgreSQL, HTTP, Websockets, Git, Docker, CI/CD, Scrum]
Worked on a portfolio manager. [Rust, PHP, Python, AsyncIO, JSON, HTTP, Websockets, Git, Docker, CI/CD]
Built multiple microservices dedicated to KYC controls. [Python, Rust, NFC, GRPC, AsyncIO, Protobuf, JSON, XML, PKI, OpenSSL, Cryptography, Git, Docker, CI/CD, ELK stack, Scrum]
Reversed a messaging service. [Javascript, HTTP, Websockets, DOM, React, Git, Docker, CI/CD, Scrum]
Built a messaging service gateway. [Javascript, Selenium, Golang, ZeroMQ, Git, Docker, CI/CD, Scrum]
Introduced new functionality to company websites. [PHP, Javascript, JQuery]

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

Supervised 4 trainees [ITIL, Scrum]
Improved internal infrastructure. [Linux, OpenBSD, FreeBSD, SSL/TLS, PKI, Bash, PHP, Python, JSON, XML, SOAP, NoSQL, MySQL, JQuery, Git, Apache, Ansible, Docker, CI/CD, Grafana]
Helped clients improve / maintain their infrastructure, by writing code, and administering their systems.

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. [Linux, FreeBSD, RHEL, Ubuntu, Debian, SOC, IDS/IPS]
Managed Certificate Authority. [Linux, FreeBSD, OpenSSL]
Managed hosting infrastructure. [Linux, RHEL, Ubuntu, Apache, Nginx]
Offered support to customers. [ITIL, Scrum]

BASF, Network Administrator 2013-12-31 — 2014-01-31

Offered support to customers. [ITIL, Scrum]
Performed maintenance on networks that were dedicated to BASF's oil platforms. [Linux, RHEL, Ubuntu, Debian, Cisco, IPsec]

ON2IT BV, Security Engineer 2011-09-30 — 2013-10-31

Identified threats and responded accordingly. [ITIL, SOC]
Implemented and maintained numerous IDS/IPS systems. [Palo Alto, Cisco, Brocade]
Designed / deployed / managed infrastructures for customers. [Linux, RHEL, Ubuntu, Debian, Ruby, Bash, Python, Apache, TCP/IP, OSI model, IPsec]

EDUCATION

Life 1992-01-01 — 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, 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)