Pakkit.net

Resume / Skills

Skills and tooling.

Each category summary points at the shipped work behind it. Most of it was built on a carrier authentication platform where correctness had consequences.

Configuration management & IaC

Versioned Ansible collections, deployment-time configuration and encrypted secrets, explicit environment validation, dry-run reports, and tested rollback safeguards.

  • Ansible
  • Ansible Collections
  • Jinja2
  • ansible-lint
  • Dry-run / check mode
  • Terraform / OpenTofu
  • SOPS / age
  • Active Directory Group Policy (ADMX)

Databases — Cassandra

Cassandra backup and restore, topology and upgrade planning, operator certification fixes, and measured development UDF optimization with compatibility testing.

  • Apache Cassandra 4.1 / 5.0
  • CQL / cqlsh
  • nodetool
  • Medusa backup/restore
  • User-defined functions
  • Multi-datacenter topology
  • Rolling upgrades
  • Primary-key design
  • Performance benchmarking

Telecom / AAA protocols

Carrier-grade subscriber authentication, with correctness validated across authentication, roaming, and accounting workflows.

  • RADIUS
  • RadSec (RADIUS over TLS)
  • EAP-AKA
  • EAP-TTLS
  • 802.1X / EAPOL
  • Passpoint / Hotspot 2.0
  • eapol_test / radclient / radsniff
  • Nokia AAA
  • Accounting & mediation
  • MVNO roaming
  • FreeRADIUS
  • Diameter
  • EAP-TLS / PEAP
  • Nokia SR OS / WAG
  • Ruckus WSG

CI/CD & artifact supply chain

Versioned releases, shared packaging rules, artifact provenance, and deployment-time configuration tooling with explicit compatibility and rollout gates.

  • GitLab CI
  • Self-hosted runners
  • Pipeline templates
  • Tag-driven releases
  • JFrog Artifactory
  • Multi-arch builds (arm64/amd64)
  • Artifact provenance
  • GitHub Actions
  • Bitbucket Server / Bamboo
  • Nexus
  • Immutable artifacts & offline bundles
  • SOPS / age

Containers & orchestration

Containerized test harnesses, plus hands-on Kubernetes and operator-based orchestration work.

  • Docker
  • Docker Compose
  • systemd-in-container harnesses
  • Kubernetes
  • Container registries & proxying

Security & compliance

Critical vulnerability research through coordinated disclosure, plus endpoint-control automation, hardening, CVE remediation, secrets hygiene, and PKI troubleshooting.

  • Vulnerability research
  • Responsible disclosure
  • EDR / endpoint security
  • Endpoint management
  • Vulnerability management
  • MFA
  • CIS benchmarks
  • sshd & sysctl hardening
  • CVE remediation
  • Mutual TLS / X.509
  • Application security & secure code review
  • Malware analysis
  • PKI / CA operations
  • Zero trust
  • Supply-chain controls
  • HMAC
  • Attack-surface analysis
  • TLS handshake analysis (ALPN)
  • Threat modeling

Observability

SIEM log-forwarding automation and enriched Linux audit-event delivery, including queued TCP transport and fixes for SELinux and audit-daemon integration.

  • Splunk
  • Splunk Universal Forwarder
  • SPL
  • Zabbix
  • Status pages
  • Datadog
  • Wazuh
  • Graylog
  • ELK
  • Sentry
  • OpenTelemetry
  • Structured logging & log pipelines
  • auditd
  • rsyslog
  • SELinux troubleshooting
  • Grafana

Virtualization & provisioning

Golden-template preparation and disposable-clone validation, cloud-init addressing, eight-node VM provisioning with unique guest identities, and infrastructure inventory reconciliation.

  • VMware vSphere / vCenter
  • ESXi upgrades
  • VM templating
  • cloud-init
  • netplan / NetworkManager
  • IPv4/IPv6 dual-stack
  • VMware vSAN
  • vCenter / DRS / VCSA
  • Distributed switches & port groups
  • Guest customization / sysprep
  • Snapshot & restore
  • phpIPAM / inventory reconciliation

Linux operations

Four distributions in daily production-adjacent use, including an end-of-life migration carried through formal certification.

  • RHEL
  • Rocky Linux
  • CentOS (EOL migration)
  • Ubuntu
  • systemd units & timers
  • dnf / grubby
  • Kernel tuning
  • udev & serial device integration

Languages & runtimes

Automation in Python and Bash, a Spring test platform in Java, device tooling in PowerShell, and product work in TypeScript and PHP.

  • Python
  • Bash
  • PowerShell
  • Java 23 / Spring Boot
  • Maven
  • TypeScript
  • PHP / Laravel
  • SQL / CQL
  • gRPC / proto3
  • SOAP / XML
  • Vendor policy DSLs
  • C#
  • JavaScript
  • HCL
  • YAML / XML / HTML-CSS

Web & product engineering

This site (Astro 6, strict TypeScript, static output) and an independent product exploration in the telecom workflow space.

  • Astro
  • Tailwind CSS
  • API design
  • SEO & structured data
  • Accessibility

AI-assisted engineering

A deployed engineering chat assistant with tested read-only gateways, evidence-retrieval and sanitization tools, and maintained agent workflows grounded in documented work.

  • AI agent workflows
  • Agent skills & steering docs
  • Slice-based development
  • Docs-as-code
  • vLLM
  • OpenAI-compatible APIs (Chat Completions / Responses)
  • Anthropic Messages API
  • Coding agents (Claude Code / Codex CLI / Cline / OpenCode)
  • Tool-use governance & approval gates
  • Prompt-injection controls
  • Webex bot integrations
  • AI application security

Engineering practices

The habits the record demonstrates: reverse engineering, parity testing, root-cause analysis, and documentation that survives certification.

  • Reverse engineering
  • Behavioural-parity testing
  • Root-cause analysis
  • Property-based testing
  • Regression test design
  • Appium (Android / iOS)
  • LDAP / AD integration
  • Release engineering

Identity & secure integrations

Native SAML, OIDC, and OAuth integrations, directory-backed account provisioning, role mapping and allow/deny tests, plus independent identity and MCP gateway engineering.

  • Authentik
  • OIDC / OAuth 2.x
  • Cloudflare Access / Workers
  • Terraform / OpenTofu
  • Tailscale
  • nftables
  • MCP
  • JWT / JWKS validation
  • SAML 2.0 / JIT provisioning
  • Grafana
  • Portainer
  • Multi-tenant isolation

Network systems

Wireless and enterprise networking, dual-stack inventory reconciliation, IPAM drift audits, RADIUS health-check diagnosis, and infrastructure from routing to physical installation.

  • MikroTik RouterOS
  • pfSense
  • VyOS
  • Cisco IOS
  • GenieACS / TR-069
  • FreeRADIUS
  • UniFi
  • VPN design / WireGuard
  • VoIP / PBX
  • RF & site surveys
  • Point-to-point wireless
  • DNS SRV service discovery
  • Firewall policy
  • phpIPAM / inventory reconciliation
  • OpenVPN

Messaging & integration

Event and protocol plumbing across game services, test fleets, and home automation: AMQP, Kafka result signals, Netty protocol handling, gRPC contracts, and custom integrations.

  • RabbitMQ
  • Kafka
  • Netty
  • gRPC / proto3
  • Home Assistant
  • MQTT

Knowledge systems

Certified runbooks and onboarding, evidence and document-consistency tooling, and a status-ledger prototype that reconciles engineering work with reported progress.

  • Obsidian / Quartz
  • Docs-as-code
  • Agent skills & steering docs
  • Jira / Confluence
  • Architecture decision records
  • MOPs & runbooks
  • Onboarding systems
  • MDX content collections

Java / JVM

Spring Boot services and test platforms, Netty protocol work, multi-module Maven builds, and WAR deployments dating back a decade.

  • Java 23 / Spring Boot
  • Spring Security
  • Spring Data JPA / Hibernate
  • Maven
  • Tomcat / WAR deployment
  • Netty
  • Log4j2
  • JUnit
  • gRPC / proto3
  • Appium (Android / iOS)

PHP / web frameworks

Laravel 5 through 11 in production: identity providers, lead-generation apps, VoIP integrations, and an Astro replatform when a dynamic surface was no longer justified.

  • PHP / Laravel
  • Laravel Nova
  • Laravel Passport / Sanctum / Socialite
  • Eloquent / Blade
  • Astro
  • Tailwind CSS
  • Attribution & conversion tracking

Physical & field engineering

The part of the network you can touch: fiber and copper installation and splicing, structured cabling, racks, hardware upgrades, and colocation, done as the ISP's own field engineer.

  • Fiber & copper installation / splicing
  • Structured cabling
  • Racks & equipment installation
  • Server & workstation hardware
  • Data-center colocation

Databases & data stores

Relational, document, and cache stores behind production applications, plus directory services; Cassandra has its own category.

  • PostgreSQL
  • MariaDB / MySQL
  • MongoDB
  • Redis
  • Zookeeper
  • LDAP / AD integration

Quality & testing

Property-based and mutation tests, failure injection that checks previous-release startability, protocol parity, and performance benchmarks scoped to their test environment.

  • JUnit
  • pytest
  • Vitest
  • Property-based testing
  • Appium (Android / iOS)
  • Selenium
  • Regression test design
  • Fault injection
  • Restore drills
  • Mutation testing
  • Performance benchmarking

Cloud & edge

Cloudflare Workers, Access, Tunnel, Origin CA and authenticated origin pulls, Pages builds, Tailscale userspace networking, and rented GPU compute behind a broker.

  • Cloudflare Access / Workers
  • Cloudflare Tunnel
  • Cloudflare Origin CA / authenticated origin pulls
  • Cloudflare KV / Pages
  • Tailscale
  • Ephemeral GPU compute (vast.ai)

Recovery & operations

Cross-system incident diagnosis, verified restores, deployment failure testing, and recovery checks that distinguish a restored service from pending prevention work.

  • Incident response & postmortems
  • Backup verification
  • Restore drills
  • Certificate recovery
  • Change gates & dry-run reports
  • Rollback engineering
  • Health checks
  • Root-cause analysis

Business systems

The systems a founder and consultant actually runs: CRM, ticketing, source hosting and CI, artifact repositories, help desk, quoting and invoicing, advertising and analytics.

  • EspoCRM
  • Jira / Confluence
  • Bitbucket Server / Bamboo
  • GitLab administration
  • JFrog Artifactory
  • Nexus
  • Help desk / ITSM
  • Quoting, invoicing & procurement
  • Advertising & analytics
  • Stripe payments

Architecture & product

Platform and product architecture: multi-module monoliths that stay honest, API-first and event-driven designs, explicit service contracts, and products built from customer discovery onward.

  • Platform engineering
  • Distributed systems
  • Multi-module monoliths
  • API design
  • Event-driven systems
  • Service contracts
  • Product engineering

Embedded & IoT

Nine networked microcontroller devices in C++, each built to measure something real — current, weight, distance, flow, temperature — and report it into an existing monitoring stack.

  • Embedded C++ / Arduino
  • ESP8266
  • I²C / SPI
  • ADC & sensor calibration
  • Interrupt-driven I/O
  • SNMP

Mobile & signal processing

Android sensor and telephony applications with real-user monitoring and CI, plus digital signal-processing tooling and reverse-engineered serial protocols.

  • Android SDK
  • Sensor filtering & smoothing
  • Real-user monitoring
  • Azure Pipelines
  • NumPy / SciPy
  • FFT & spectral analysis
  • Digital modulation
  • PyQt5 / pyqtgraph

Go deeper

The rest of the record

Contact

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