Freelancer profile translated to English.
Back to original languageAbout Jason
Profile
Since 2008, I have been active in IT, specializing in network infrastructures since 2009. Over the years, I have gained extensive experience in setting up, securing, and managing business-critical networks.
My experience lies primarily in technically complex environments such as enterprise, telecom, service provider, and data center infrastructures. For example, I worked at KPN (telecom/service provider) and Optiver (financial sector) on large-scale networks with high demands on availability, security, and performance.
I have broad experience with large-scale security and firewall management, including managing over 300 physical and virtual firewalls in service provider and multi-tenant data center environments.
Additionally, I have three years of professional experience in software development. During that period, I developed, among other things, a central administration system to support operational processes in network management. This formed the basis for my further specialization in network automation, a field in which I have been continuously deepening my expertise ever since.
In addition to my technical knowledge, I am well-versed in both ITIL and Agile work environments. I have experience with project management, am accustomed to working in multidisciplinary teams, and support others where needed.
What others say
“Pleasant to collaborate with: open, enthusiastic, helpful, and often a go-to person for colleagues”
“Does not shy away from unknown challenges and learns by doing”
“Asks clarifying questions until it's right and quickly masters new subjects”
“Realistic and pragmatic, thinks in solutions that fit the situation”
Dutch
Native or bilingual
English
Fluent
Can work on-site
Den Haag (up to 50km), Amsterdam (up to 10km), Rotterdam (up to 10km), Utrecht (up to 10km)
Experience
- KPN (extern)Network (Security) Engineer at KPN, The HagueJuly 2012 - January 2020 (7 years and 6 months)Den Haag, NetherlandsWithin the Infrastructure Management department, I was primarily involved in projects focused on improving the network and security infrastructure of KPN's management network (Fixed and Mobile). This infrastructure enabled secure access to production environments for internal and external users and systems.My responsibilities included analyzing the existing and desired network situation, creating network designs (High- and Low-Level Designs), IP planning and management including DNS, and developing migration plans with connectivity and firewall matrices and associated test plans. I also resolved issues such as overlapping networks, retaining specific IP addresses, and analyzing unknown or poorly documented traffic flows.In execution, I implemented and configured network components (including firewalls) and performed migrations, ranging from adjusting firewall policies and routing to network expansions, network re-segmentations, and software and hardware upgrades. For projects I was responsible for, I delegated subtasks and remained available as a specialist for specific network questions after handover.Furthermore, I contributed to standardization, including developing standard templates for network diagrams, documenting management requirements, developing configuration templates, uniformly integrating network equipment into management tools, and restructuring firewall policies and standardizing firewall objects. I also supported other teams with network automation.
Projects and programs:
Important projects and programs I contributed to include (in chronological order):- Firewall Cleanup Mobidata
- Improvement of Mobidata Network Management
- One Management DMZ (1BDMZ)
- BDMZ Migration Factory
- Sauron: Administration System for Network Management
- KPN (extern)Network EngineerMay 2011 - July 2012 (1 year and 2 months)Den Haag, NetherlandsWithin the Engineering & Installation IP (E&I IP) team, I supported large corporate clients using Epacity IP-VPN (where clients were responsible for router management) and KPN-ONE (fully managed by KPN). Both solutions offered connectivity between company locations via MPLS and E-VPN technology.
Responsibilities:
- Implemented and modified network solutions within client environments
- Resolved design and implementation issues
Client examples:
Ahold (Albert Heijn, Etos, Gall & Gall):Delivered network solutions for approximately 1,200 store locations- Contributed to improved network availability by implementing 3G backup as failover for critical connections, performed during business hours with minimal disruption to payment traffic
vtsPN (Provision for Cooperation Police Netherlands):Part of the onboarding team that integrated vtsPN into the network platform- Contributed to the implementation of infrastructure components for network connectivity for police services
- OptiverNetwork EngineerJanuary 2010 - May 2011 (1 year and 4 months)In this role, I contributed to the management of Optiver's network infrastructure, including the head office in Amsterdam, collocations in Europe, and connections to offices in Chicago and Sydney, as well as links to exchanges and financial parties.
Responsibilities:
- Independently resolved less complex network issues within agreed SLA deadlines
- Contributed to network security through port security, access lists, firewalls, and VPN access
- Installed equipment (servers, switches, routers, PDUs) and laid cabling in data center environments
Recommendations
Be the first to recommend Jason
Help this freelancer shine by sharing your experience working together.
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- Bachelor of Science (BSc) in Cyber SecurityAmsterdam University of Applied Scienceso Anticipated Graduation: May 2026
- Bachelor of Science (BSc) in System and Network Engineering (SNE)Amsterdam University of Applied Scienceso 2013 - 2016 (Unfinished; achieved propaedeutic diploma) . . . . . . . o Relevant Coursework: Object-Oriented Programming (OOP), Data Models and Databases, Big Data, Python Programming, System and Network Programming, Cyber Security