Single Sign-On & Access Gateways
Give your teams a single, trusted way in - and give your security and operations teams the clarity to stay in control. We design and deliver bespoke SSO and access gateway platforms that reduce friction for users while making access rules consistent, visible, and enforceable across your services.
Built with an open-source mindset and engineered for real-world constraints, our solutions integrate cleanly with what you already run, avoid unnecessary vendor lock-in, and stay maintainable long after go-live.
What Are Single Sign-On & Access Gateways?
Single Sign-On (SSO) is an authentication approach that allows users to sign in once and then access multiple authorised applications and services without re-entering credentials. It typically relies on standards such as SAML 2.0, OAuth 2.0, and OpenID Connect (OIDC) to establish trusted identity assertions between systems.
Access Gateways sit in front of protected services and provide a consistent control point for access decisions. They can enforce authentication requirements, apply contextual controls (such as MFA and conditional access), and ensure requests meet policy before reaching internal applications.
Used together, SSO and Access Gateways provide a cohesive access layer across cloud, on-premises, and legacy environments. This improves security consistency, simplifies governance, and reduces operational complexity as your application environment grows.
Platforms & Technologies We Work With
Non-exhaustive - depends on requirements.
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Identity & SSO Protocols
SAML 2.0, OAuth 2.0, OpenID Connect (OIDC)
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Directories & Identity Stores
Active Directory, LDAP, Microsoft Entra ID (Azure AD), Okta (and compatible IdPs)
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SSO & Identity Platforms
Keycloak, authentik, Gluu (where suitable)
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Access Gateways & Proxies
NGINX, HAProxy, Traefik, Caddy
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Policy & Enforcement Patterns
RBAC, ABAC, conditional access, MFA enforcement (e.g., TOTP, WebAuthn/FIDO2/SMS/email)
Where Access Breaks Down, and How We Fix It
Modern businesses often have a mix of SaaS platforms, internal tools, legacy applications, and third-party portals - each with different authentication methods, permission models, and audit capability. This creates inconsistent policy enforcement, increases the likelihood of over-privileged access, and makes it harder to demonstrate control during audits or incident response.
We implement a unified access layer that centralises authentication, standardises policy enforcement, and brings governance into one place. That includes integrating your existing directories and IdPs, applying role-based access and MFA consistently, and using gateways to protect sensitive services that were never designed for modern access controls.
Password fragmentation
Too many separate logins lead to password reuse and higher account takeover risk. Centralised authentication reduces credential exposure and enables stronger sign-in controls.
Reset-driven disruption
Frequent password resets slow teams down and add avoidable support load. A single, consistent sign-in flow reduces friction and cuts helpdesk demand.
Manual joiner/mover/leaver processes
Hand-managed access changes introduce delays and mistakes. Automated lifecycle controls align access with directory and role changes to keep permissions current.
Uneven policy enforcement
Different applications apply different security rules, creating gaps and uncertainty. A consistent policy layer enforces requirements uniformly across systems.
Industry-Focused Access Architecture
Every industry has different pressures: compliance obligations, user populations, availability requirements, and legacy constraints. We design SSO and Access Gateway implementations around how access really works in your environment - from workforce identity and privileged admin access to third-party onboarding and audit reporting that stands up to scrutiny.
Healthcare
Secure, compliant access to clinical and administrative systems with strong auditing and role-driven permissions.
Telecoms
Controlled access to network tools, customer platforms, and operational portals - reducing risk while improving service continuity.
E-commerce
Safer customer and internal access journeys that protect payment systems and improve sign-in experience during peak demand.
Education
Seamless access for students and staff across learning platforms and admin tools, with simplified onboarding and offboarding.
Logistics
Stronger access governance for tracking, inventory, and fleet systems - keeping critical operations secure and available.
Manufacturing
Centralised control across production, OT-adjacent applications, and supply-chain systems - reducing operational disruption and limiting access exposure.
What You Get Out of the Box
Our SSO and Access Gateway solutions strengthen access control while improving user experience and reducing administrative burden.
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Unified Login Experience
One secure authentication flow across applications, improving adoption and productivity. -
Centralised Identity Management
Consistent user lifecycle control with clearer policy enforcement and reduced admin complexity. -
Stronger Authentication Controls
MFA and conditional access reduce unauthorised access and limit credential-based attacks. -
Role-Based Access Control
Permissions aligned to roles, departments, and responsibilities - supporting least-privilege access by design. -
Auditability & Reporting
Clear logs and reporting that support investigations, compliance, and governance requirements. -
Directory Integration
Works with LDAP/AD and modern identity providers for continuity and reduced duplication.
From Discovery to Operational Confidence
We don't deploy generic identity stacks. Each SSO and Access Gateway solution is built around your technical environment, risk profile, and operational needs - so it stays reliable as your business grows.
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Landscape Review & Requirements
We map your applications, user groups, identity sources, and authentication flows, then confirm what “good” looks like for security, usability, and compliance. Where needed, we also identify quick wins and high-risk systems that should be prioritised first.
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Target Design & Rollout Plan
We define the access architecture, select the right open-source and/or proprietary components, and design policy foundations such as RBAC, MFA, and conditional access. You also get a phased rollout plan that reduces disruption, supports pilot groups, and makes onboarding predictable.
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Build, Integrate & Validate
We deploy and configure the platform, integrate applications across cloud, on-premises, and legacy environments, and implement gateway controls for sensitive services. We then test sign-in flows, policy behaviour, logging, and failure scenarios to ensure the access layer behaves as intended.
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Handover, Enablement & Support Options
We deliver documentation and practical knowledge transfer for your administrators and service desk teams, including repeatable steps for onboarding future applications. If you want us alongside you longer-term, we can provide ongoing monitoring, continuous improvement, and structured support through our Technical Support Agreements or Flexible Support Packages.
Why Choose OnyxSis?
People-First, Engineering-Led
We're a hands-on engineering team that stays close to the problem, communicates clearly, and takes ownership from first workshop through to live operation. You'll work directly with specialists who care about outcomes, not just deliverables.
Open-Source DNA, Enterprise Discipline
Open source is part of who we are, and we bring that mindset to every engagement with rigorous design, documentation, and delivery. You get transparent choices, pragmatic trade-offs, and an implementation you can maintain with confidence.
Evidence That Stands Up in the Real World
Our delivery track record includes the Issue Diagnosis & Evaluation Suite, a unified diagnostic platform built for a UK telecoms provider using open-source technologies. We improved operational reliability and performance, contributing to measurable outcomes like a 24% increase in successful subscription provisioning and a 61% rise in first-contact resolutions.
That same approach carries into our access work: careful integration, operational clarity, and solutions designed to perform under real constraints. We focus on measurable improvements you can see in reduced friction, tighter governance, and fewer access-related incidents.
With You After Go-Live
After go-live, we stay close to refine policies, onboard new apps, and respond fast as priorities shift - aligned to your team and timelines.
For guaranteed response times and structured coverage, we offer SLA-Based Technical Support and Dedicated Support Hours for predictable operational assurance.
Ready to simplify sign-in and strengthen control? We'll help you design an approach that fits your environment, scales with you, and builds a secure, supportable access foundation.
Unify Access Without Compromising Security
SaaS, internal tools, legacy apps, third parties - we integrate them into one coherent access layer with consistent controls.
