Cloud Migration & Network Architecture

Cloud change does not have to feel risky or disruptive. With the right engineering, you can modernise at pace while keeping services stable, access controlled, and performance predictable.

We build bespoke cloud migration and network architecture that put you back in control - grounded in trusted open-source technologies, designed for resilience, and delivered with the transparency your teams need to own and evolve the platform.

What Are Cloud Migration & Network Architecture Services?

Cloud migration and network architecture reshape how your systems connect, perform, and stay protected. A successful migration isn't just about moving workloads - it's about building an architecture that supports availability, security, and future change.

Cloud migration covers the planning, movement, and validation of applications, data, and services from on-premises infrastructure or data centres into cloud environments. This may include rehosting, replatforming, refactoring, or building cloud-native components, depending on goals and constraints.
Network architecture ensures traffic flows efficiently and securely across sites, clouds, users, and applications. This includes segmentation, routing, VPNs, firewalls, load balancing, access controls, and resilient designs that reduce single points of failure.

Together, these services help businesses increase agility, strengthen security posture, and improve uptime - while keeping operational realities, regulatory needs, and cost control at the centre.

Platforms & Technologies We Work With

Non-exhaustive - depends on requirements.

Public Cloud

AWS, Microsoft Azure, Google Cloud, DigitalOcean, OVHcloud, Vultr
Private Cloud & Virtualization

OpenStack, VMware, Proxmox VE, XCP-ng
Networking & Connectivity

HAProxy, NGINX, WireGuard, IPsec, OpenVPN, CoreDNS, BIND
Security & Access

nftables/iptables, pfSense/OPNsense, SSO, MFA, RBAC
Automation & Observability

Terraform, Ansible, Prometheus, Grafana, Loki/ELK

Tackle Migration & Network Risk Head-On

Cloud migrations and network changes shouldn't feel like a leap in the dark. When dependencies are unclear, cutovers are rushed, and controls arrive late, even well-run teams end up firefighting while trying to keep services stable.

We bring clarity and reliability by mapping applications and network paths end-to-end, then turning that insight into a practical plan: sequenced change, rehearsed cutovers, and tested rollback options with clear ownership. You'll know what's changing, why it matters, and what happens if something doesn't go to plan.

From target architecture through implementation, we build solutions around your environment - never a one-size-fits-all template. We're passionate about open source and automation, and we pair them with security-by-design and documentation that keeps power and control firmly with you.

Planned Downtime

Cutover interruptions can hit customers and revenue. We phase migrations, use controlled windows, and validate with rehearsed rollback plans.

Data Loss & Integrity

Poorly governed transfers can cause corruption, exposure, or gaps. We use encrypted paths, verification checks, and backup/restore safeguards around cutover.

Latency & Congestion

Routing and capacity mistakes slow systems and frustrate users. We model flows, right-size connectivity, and tune load balancing and DNS for steady performance.

Security & Compliance Drift

Fast change can leave inconsistent rules and untracked access. We standardise policy, enforce segmentation and least privilege, and deliver auditable configs and runbooks.

Architected for Your Industry

Cloud and network architecture deliver the most value when designed around real-world operating conditions - uptime expectations, regulatory constraints, growth patterns, and user experience demands. We build supportable architectures that reduce outages, strengthen security, and keep systems responsive across industries.

Telecoms

Build resilient, multi-site architectures that improve availability and simplify scaling across distributed services.

E-commerce

Support high-traffic surges with secure, performant connectivity that keeps checkout fast and platforms stable.

Healthcare

Protect sensitive data and enable reliable, compliant access to critical systems with strong segmentation and controls.

Education

Provide secure, scalable platforms for learning and collaboration, reducing friction during peak academic periods.

Logistics

Improve visibility and reliability across tracking, inventory, and coordination systems with dependable connectivity.

Manufacturing

Connect facilities and operational systems with low-latency networks that support automation and improve uptime.

Outcomes You Can Measure

Our cloud migration and network architecture services focus on measurable operational outcomes - availability, security, and performance - while keeping the solution manageable for your teams.

Secure Segmentation & Access Control
Reduce exposure with structured network boundaries and controlled access paths.
Resilient, High-Availability Design
Remove single points of failure and improve service continuity.
Performance-Driven Architecture
Optimise routing, latency, and traffic flow to keep systems responsive.
Predictable Migration Planning
Clear sequencing, testing, and rollback options reduce risk and disruption.
Scalable by Design
Architect platforms that grow with demand - without repeated redesign cycles.
Operational Clarity
Documentation, runbooks, and handover support enable confident day-to-day ownership.

How We Deliver, Step by Step

We don't apply generic migration playbooks. Every migration and architecture design is shaped around your workloads, dependencies, compliance requirements, and operational constraints - so the outcome is stable and supportable long after go-live.

1

Current-State Review & Requirements

We review your existing infrastructure, network topology, applications, dependencies, security posture, and business requirements. This identifies risks, constraints, and the most practical migration approach.
2

Target Blueprint & Cutover Roadmap

We produce a target-state architecture and phased migration plan, including network design, security controls, cutover strategy, and validation steps - aligned to your budget, timelines, and operational capacity.
3

Build, Migrate & Validate

We build and test the new environment, migrate in stages, and use parallel runs where needed to keep services stable. Automation is introduced to reduce manual error and improve repeatability.
4

Enablement, Handover & Ongoing Support

We provide documentation, operational guidance, and team training to ensure smooth ownership. Ongoing optimisation and support are available via our Technical Support Agreements and flexible support options.

Why Choose OnyxSis?

People-First, Engineer-Led

We're a small, senior team that stays close to your stakeholders, communicates clearly, and takes ownership from discovery through delivery. You'll always know who is responsible, what is changing, and why.

Open-Source at Our Core

Open-source isn't a bolt-on for us; it's how we think, build, and keep you in control. We choose technologies for fitness and long-term maintainability, not licensing pressure or vendor incentives.

Results You Can Point To

For a UK telecommunications provider, we delivered a Multi-Data Centre Network Transformation that removed single-provider dependency and strengthened resilience across sites. The outcome was 96% less unplanned downtime and a 24% reduction in annual hosting spend.

We designed the programme to scale fast under peak demand without compromising security or operational control - proof of what's possible when architecture, automation, and accountability are treated as one system.

Support That Stays With You

After go-live, we stay hands-on with guidance, tuning, and change planning - led by the same engineers who know your environment.

For extra cover, our SLA-based support and Dedicated Support Hours set clear expectations and provide capacity for proactive maintenance and improvements.

When you're ready, we'll turn a complex migration into a controlled programme with visible progress and measurable outcomes - delivering a platform your team can confidently run and evolve.

Talk to Our Team

Frequently Asked Questions

How do you determine if we're ready for cloud migration?

We begin with a structured assessment of workloads, dependencies, security requirements, and operational constraints, then define a migration approach that balances risk, cost, and speed.

Which cloud model is best: public, private, or hybrid?

It depends on compliance, latency, control requirements, and cost. We map these needs to an architecture that fits - often hybrid where legacy or regulatory constraints exist.

What if we need to keep some systems on-premises?

That's common. We design hybrid connectivity, segmentation, and operational processes so on-premises and cloud services work together safely and reliably.

How do you handle regulatory or audit requirements?

We capture requirements early, then build security controls, access models, and documentation that support auditability without slowing delivery.

Can you help choose between AWS, Azure, or Google Cloud?

Yes. We evaluate technical fit, services required, operational maturity, and cost considerations to recommend the most appropriate platform.

How do you minimise downtime during migration?

We use phased migration, pre-cutover testing, parallel runs where necessary, and controlled change windows - with rollback planning to reduce disruption.

How long does a cloud migration take?

Timelines depend on scope and complexity. We provide a staged plan with milestones so progress is visible and controlled.

How do you protect data during and after migration?

We use secure transfer methods, encryption, strict access controls, and post-migration validation, followed by hardening and monitoring recommendations.

Can you handle data residency or sovereignty requirements?

Yes. We design architectures that meet location and compliance rules, including region controls and segmented access models.

Do you implement zero-trust principles?

Yes. We can design access-aware controls, micro-segmentation, and verification controls that reduce lateral movement and improve policy enforcement.

How do you manage cloud costs?

Through right-sizing, tagging, scaling policies, and visibility tooling - so spend aligns to usage and budget expectations.

Can you provide cost estimates before we start?

Yes. We can produce an indicative cost model and phased delivery plan once discovery clarifies scope, constraints, and target outcomes.

Do you help with ongoing cost optimisation after go-live?

Yes. We can set up governance, alerts, and review patterns so spend stays aligned with usage as your environment evolves.

What's your disaster recovery approach?

We design backups, replication, and failover patterns based on RPO/RTO targets, ensuring recovery plans are tested and operationally realistic.

How do you ensure good performance for distributed users and sites?

We optimise routing, use load balancing and regional design patterns, and reduce latency through thoughtful placement of services and connectivity.

Still have questions? Contact us - our team is here to help.

Migration, Without the Guesswork

A clear path from current-state to cloud-ready, with secure networking and reliable, well-managed change.