Network • Data Center • Global Infrastructure • Automation

I DESIGN.
I BUILD.
I OPERATE.

CCNP-certified Network & Infrastructure Engineer with 10+ years delivering enterprise networking, data center operations, global network infrastructure, Cisco Nexus and Catalyst platforms, production change execution, technical documentation, and AI-assisted automation.

Explore My Work Download Resume Verify Certifications
How I Deliver Infrastructure

From requirement to production.

My value is not limited to one phase of a project. I can move from design to implementation, change execution, validation, troubleshooting, and operational handoff.

01
RequirementUnderstand business and technical needs
02
HLDDevelop physical/logical design and align with customer approval
03
LLDTranslate design into build-ready detail
04
BoMAlign hardware, optics and infrastructure
05
ChangeCRQ, MOP, risk, rollback and CAB review when required
06
DeployRefresh, migration, onboarding and cutover
07
ValidatePost-change checks and service verification
08
OperateTroubleshoot, monitor, improve and document
What I Actually Build

Infrastructure that survives production.

Enterprise networking, data center engineering, WAN transformation and automation — connected by one principle: the design must work in the real world.

01 / NETWORK TRANSFORMATION

Cisco Nexus & Catalyst Infrastructure

Technical delivery of Cisco EOL/EOS-driven hardware refresh and network migrations, from assigned Service Request through production validation.

  • Prepare device configurations and scripts; install or upgrade Cisco IOS/NX-OS to approved, field-tested enterprise Gold Standard releases rather than simply the latest version.
  • Layer 2/3 operations across VLANs, STP, HSRP, vPC, Port-Channels, EIGRP, ARP and MAC tracing.
  • Work with assigned Project Managers on technical replacement plans, Bills of Materials, equipment ordering and installation oversight.
Nexus 9000Catalyst 9500Catalyst 9400NX-OSIOS-XE
02 / WAN & SD-WAN READINESS

Enterprise WAN Delivery & SD-WAN Readiness

Enterprise WAN delivery support with hands-on preparation for SD-WAN onboarding and production change execution.

  • Network design inputs, implementation coordination and technical documentation for enterprise WAN changes.
  • Support SD-WAN onboarding readiness by coordinating management IP provisioning, SSMO requests, connectivity validation, and device preparation for vManage onboarding.
  • Deployment and onboarding readiness for Cisco Catalyst 8300/8500 platforms within SD-WAN environments.
  • CRQs, rollback plans, risk assessments and validation steps for production changes.
SD-WAN ReadinessvManage OnboardingC8300C8500Change Windows
03 / INFRASTRUCTURE OPERATIONS

Network & Data Center Infrastructure Operations

Maintain global infrastructure data integrity by reconciling and validating network asset, configuration and lifecycle information across NetBrain, NCM, TSNA and Cisco CSPC.

  • Validate device inventories, ownership, operational status and lifecycle records against production infrastructure across global environments.
  • Support configuration backup oversight, software/hardware visibility and lifecycle assurance through NCM, TSNA and Cisco CSPC.
  • Validate topology, dependencies and device state in NetBrain, supporting fault isolation and reliable operational records.
  • Experience supporting global enterprise network infrastructure spanning thousands of network devices and wireless access points; use WLC and Cisco Catalyst Center for wireless visibility, assurance and troubleshooting.
NCMTSNACisco CSPCNetBrainWLCCatalyst CenterGlobal Wireless
04 / AI-ASSISTED AUTOMATION

Infrastructure Data Automation, Governance & Assurance

Developed custom Excel VBA automation engines with AI-assisted development to eliminate repetitive manual data processing, improve data consistency, and streamline network infrastructure asset reconciliation and reporting.

  • Automate serial-number matching, duplicate detection, record normalization and AssetForm population.
  • Flag mismatched records across source systems to improve inventory quality and traceability.
Global Data AnalysisAI-Assisted DevelopmentVBA EnginesData GovernanceData AssuranceAsset Reconciliation
05 / CHANGE MANAGEMENT

Production Change Engineering

Structured technical change execution designed to reduce risk and protect service continuity.

  • Prepare Change Requests (CRQs) with detailed Methods of Procedure (MOPs), implementation steps, risk assessments, validation checks and rollback plans.
  • Execute approved infrastructure changes, including Cisco lifecycle refresh, migrations, router and switch replacement, AP refresh and decommissioning.
  • When required, participate in customer Change Advisory Board (CAB) reviews to explain the MOP, answer technical questions and secure approval before execution.
CRQ / MOPCABRollbackRisk AssessmentValidation
06 / DATA CENTER OPERATIONS

Hands-On Infrastructure

Practical data center experience across rack, power, cabling, circuits, support and operational troubleshooting.

  • Rack/stack, structured cabling, ports, circuits and remote-hands coordination.
  • Incident response, root-cause analysis and service recovery.
  • Exposure to UPS/PDU, generators, cooling and colo/carrier-hotel environments.
Rack / StackPatchingUPS / PDUColocation
Operational Profile

Design discipline. Production mindset.

I understand what infrastructure looks like in Visio — and what happens when someone has to upgrade it, cable it, cut it over, validate it and support it under production pressure. 

$ profile --slawek-stec --production

NETWORK        Cisco Nexus | Catalyst | SD-WAN | Global Fabric / NaaS
ROUTING        BGP | OSPF | EIGRP | HSRP | vPC | VSS | L2/L3
DESIGN         HLD | LLD | BoM | MDF/IDF | HA
CHANGE         CRQ | Risk | Rollback | Validation
DATA CENTER    DCIM | Rack | Cabling | Power | Colo | RCA
AUTOMATION     AI-Assisted VBA Engines | Asset Reconciliation
CLOUD          AWS Foundations
TOOLS          NetBrain | NCM | TSNA | Cisco CSPC | Catalyst Center
               Ekahau

STATUS         Ready for complex infrastructure work.
10+ YearsEnterprise network & data center experience
CCNPActive Cisco professional certification
SD-WANEnterprise onboarding and WAN transformation
Global ScopeInfrastructure data integrity, reconciliation and assurance
End-to-EndDesign → change → deploy → validate → operate
100% First-PassAcceptance achieved across multiple consecutive asset service requests
Forward Focus / Professional Interest

AI Data Center Infrastructure.

Applying a foundation in enterprise networking and hands-on data center operations to the reliability challenges of high-density AI infrastructure.

TRANSFERABLE EXPERIENCE

Physical Infrastructure & Resilience

Experience with data center cabling, rack infrastructure, circuit coordination, power provisioning, incident response and the operational dependencies behind service availability.

Critical InfrastructurePower / Cooling AwarenessFailure AnalysisOperational Readiness
AREAS OF INTEREST

High-Density Compute Environments

Strong professional interest in AI-ready data centers, modular and prefabricated data center infrastructure, high-density GPU computing environments, advanced thermal management, direct-to-chip liquid cooling, coolant distribution units (CDUs), and immersion cooling technologies.

AI Data CentersModular Data CentersGPU ComputingLiquid CoolingCDUImmersion Cooling
Career Evolution

From the Data Center Floor to Global Network Engineering.

My career has expanded from hands-on North America data center operations within a global enterprise to global network infrastructure delivery for a Fortune 500 biopharmaceutical environment.

FOUNDATION

North America Data Center Operations

Operational responsibility across 5 major HUB locations and hundreds of IDFs within a global enterprise environment.

5 HUBsHundreds of IDFsRack / Power / CablingLifecycle
TODAY

Global Network Infrastructure Delivery

Global network engineering, device configuration, change execution and infrastructure delivery for a Fortune 500 biopharmaceutical enterprise.

Global ScopeData Center Network DevicesSD-WAN ReadinessProduction Changes
Experience

Built in real environments.

Experience spanning enterprise network design, data center operations, network refresh, SD-WAN onboarding readiness, change engineering, infrastructure automation and production support.

2022 — Present · BT Group

Network Designer / Customer Solution Design Professional

Global network infrastructure delivery for a Fortune 500 biopharmaceutical enterprise, spanning network solution design, device configuration, technical documentation and production change execution.

  • Develop customer-reviewed High-Level Designs (HLDs) for new enterprise sites, proposing hardware, IP address allocation, subnet/VLAN segmentation and DHCP scope/option requirements based on operational needs and wireless survey findings; refine designs through stakeholder review and formal approval.
  • Coordinate WAN circuit provisioning, Bills of Materials and installation readiness, then support configuration, activation, commissioning and on-site oversight when required.
  • Own technical execution of assigned Cisco EOL/EOS refresh Service Requests with designated Project Managers, from scripts and Gold Standard IOS/NX-OS preparation through equipment ordering, installation coordination, cutover and validation; separately support SD-WAN onboarding readiness.
  • Prepare CRQs with full MOPs, validation and rollback steps; attend customer CAB reviews when required to address technical questions before approval.
  • Complete post-change operational handoff and update global infrastructure records in NetBrain, NCM, TSNA and Cisco CSPC.
2015 — 2022 · BT / Unilever

Regional Data Center Operations / Senior Network Consultant

Large-scale North America data center and network infrastructure operations for a major global consumer goods enterprise, supporting 5 major HUB locations and hundreds of IDFs across critical business environments.

  • Supported day-to-day infrastructure operations across 5 major HUB locations and hundreds of IDFs throughout North America.
  • Rack/stack, structured cabling, power provisioning, circuits, ports and remote-hands coordination.
  • Incident response, root-cause analysis, equipment refresh, decommissioning and infrastructure lifecycle support.
  • Worked with UPS/PDU, generators, cooling systems and colocation/carrier-hotel environments as part of data center operations.
Active Certifications

Verified, not just listed.

Certifications are part of the profile, but they are backed by hands-on engineering experience. Active Cisco credentials can be independently verified through Credly.

Current credentials
Cisco CCNP
AWS Certified Cloud Practitioner
Cisco Data Center Fundamentals (DCFNDU)
Managing Cisco Network Operating Systems
Verification

Active Cisco Certifications

Verify current Cisco certification status and digital badges directly on Credly.

Verify on Credly ↗
Open to the right opportunity

Network. Infrastructure. Data Center. Transformation.

Open to considering challenging opportunities that bring together enterprise networking, infrastructure design, production change, automation, and operational ownership.

Email: contact@slawekstec.com
WhatsApp: +1 917-355-5055