Technology & consulting partner delivering Software Engineering, Testing, Verification & Validation, Automation, DevOps, AI, Cloud, Data, ITIL & Staffing.
Global Support.
From engineering to sign-off — precision, the right talent, and intelligent process at every stage of your delivery lifecycle.
End-to-end engineering with clean architecture and delivery excellence — from initial design through to production deployment.
Scalable, high-performance platforms engineered for longevity, security, and seamless user experience.
Full UAT ownership — planning, execution, defect triage, stakeholder sign-off, and release validation.
Independent review of test processes and quality frameworks with gap analysis and actionable recommendations.
Streamlining delivery workflows through Agile methodology, lean principles, and AI-assisted tooling.
High-calibre engineers, QA leads, and UAT specialists placed with precision for your projects and permanent teams.
Modern, reliable, outcome-driven technology services built around your business needs — delivered by specialists who understand the work.
Modern software engineering, cloud, and automation solutions aligned to business outcomes and future-ready architectures.
Explore TechnologyStructured UAT leadership, test strategy, and quality governance for confident, informed go-live decisions — underpinned by rigorous testing process audit and continuous improvement.
Explore TPI & UATSpecialised IT recruitment and resource placement — connecting high-calibre professionals with the right organisations.
Explore TalentAI-enhanced delivery, intelligent tooling, and automation capabilities embedded across every service line we offer.
Explore AIWe combine engineering excellence with deep domain expertise to deliver reliable, scalable, and future-ready technology solutions tailored to your organisation.
Expert talent at the core of every engagement, every time.
Intelligent tooling that accelerates quality delivery.
Results-focused from kickoff through to go-live.
Ireland HQ with seamless global delivery & support reach.
We support your technology journey from the first requirement through to deployment and beyond — covering every stage of the SDLC alongside critical support activities.
Business analysis, stakeholder workshops, and requirements gathering to define clear scope and acceptance criteria.
Architecture design, system design, UI/UX prototyping, and technical specification to shape the solution.
Clean, maintainable code delivery using Agile sprints, peer review, and CI/CD best practices.
Unit, integration, system, regression, and UAT — ensuring quality is verified at every layer.
Controlled, automated deployments with environment management, release notes, and rollback plans.
Hypercare support, incident monitoring, and post-deployment validation to ensure a successful launch.
Ongoing BAU support, bug fixes, enhancements, and continuous improvement post-production.
Critical activities we embed throughout every stage to ensure quality, compliance, and performance.
Threat modelling, OWASP checks, GDPR compliance, and security testing embedded throughout the delivery cycle.
Data pipeline design, ETL development, reporting dashboards, and analytics integration from day one.
Cloud architecture, AWS/Azure/GCP setup, container orchestration, and infrastructure-as-code delivery.
Pipeline automation, environment management, monitoring setup, and deployment governance across all stages.
AI-assisted development, intelligent test automation, and process bots integrated at every delivery phase.
Scrum, Kanban, and SAFe delivery management — sprint planning, retrospectives, and stakeholder reporting.
Technical specs, API docs, runbooks, test plans, and knowledge base articles maintained throughout delivery.
Third-party integrations, REST/GraphQL API development, and middleware connectivity across all platforms.
From UAT strategy to mobile, automation, and performance testing — one integrated quality practice covering every dimension of your product.
Comprehensive plans, entry/exit criteria, and stakeholder alignment for a controlled, well-governed testing cycle.
Structured execution across functional, regression, and edge-case scenarios — tracked with full transparency.
Rapid classification, root cause collaboration, and retest cycles that keep releases on schedule.
Formal sign-off coordination, release readiness assessment, and post-deployment confirmation.
Independent review of QA frameworks with gap analysis and implementation of consistent standards.
Structured audits of test coverage, tooling, and governance with clear, actionable recommendations.
Our Testing Process Review is a structured, independent assessment of your current QA and testing practice. We examine every layer — strategy, coverage, tooling, and governance — to produce a clear, prioritised roadmap for improvement.
Stakeholder interviews and documentation review to understand your current testing landscape, team structure, tools in use, and delivery cadence.
We analyse your test cases, coverage metrics, defect history, and regression reliability to identify blind spots and areas of systemic risk.
We evaluate how testing integrates into your SDLC — entry/exit criteria, sign-off workflows, CI/CD gates, and stakeholder communication practices.
A hands-on review of your test automation frameworks, tooling configuration, reporting dashboards, and CI integrations to identify technical gaps and quick wins.
We score your current testing practice against industry benchmarks across six maturity dimensions, highlighting where you are strong and where risk is highest.
A clear, prioritised improvement plan with quick wins, medium-term initiatives, and strategic goals — including tooling recommendations, process templates, and ownership guidance.
Alignment of test approach to business risk, architecture, and delivery model.
Quality, coverage, and traceability of test cases against requirements and user stories.
Consistency, discipline, and efficiency of test cycles, environments, and defect flow.
Framework quality, CI/CD integration, maintenance burden, and coverage effectiveness.
Metrics, sign-off processes, stakeholder visibility, and release readiness criteria.
QA capability, knowledge sharing, shift-left practices, and cross-functional collaboration.
Full functional and regression testing across iPhone and iPad device families and OS versions.
Rigorous validation across the Android device ecosystem, OS fragmentation, and manufacturer variants.
Consistent experience validation across iOS, Android, and web to ensure unified product quality.
Purpose-built automation frameworks tailored to your stack, CI/CD pipeline, and team maturity.
Seamless automation integrated into your pipelines for continuous, reliable quality gates.
Automated coverage at the API layer to catch defects earlier and reduce UI test dependency.
Validate system behaviour under expected and peak user loads before go-live.
Push systems beyond limits to understand failure modes and recovery behaviour.
Performance analysis at the infrastructure and database level for end-to-end optimisation.
CALLIBERS integrates AI wherever it delivers meaningful value — combining human intelligence with modern technology across the full delivery lifecycle.
We match organisations with talent that fits both technically and culturally — because we understand the work ourselves.
Are you a QA engineer, test analyst, UAT specialist, testing manager, software developer, cloud engineer, DevOps specialist, data engineer, or technology professional looking for your next opportunity? Join the Callibers talent network and get matched to roles that genuinely fit your expertise and career ambitions.
Building your QA team, looking for a UAT specialist, need a cloud engineer, DevOps lead, data engineer, or other technology resource at short notice? Tell us what you need and we will match you with pre-vetted, specialist professionals — quickly and precisely.
Specialist UAT and BAT expertise embedded on the client side throughout the full testing lifecycle.
We deploy UAT experts directly to your organisation — working within your environment, representing your business interests throughout acceptance testing phases. This is critical when software is being developed and tested by a third-party service provider.
⚠ Why This Matters: It is critically important to have a dedicated UAT expert on the client side during UAT phases — especially where the system has been developed and tested by an external service provider. Your UAT expert protects your business interests, ensures requirements are genuinely met, and provides independent validation before sign-off.
Entry criteria, test scope, resource planning & schedule
Scenario design, test data setup & environment readiness
Structured execution, defect logging & daily reporting
Triage, prioritisation, retesting & regression cycles
Exit criteria validation, sign-off report & go-live clearance
Comprehensive UAT strategies aligned to your business requirements, risk profile, and delivery timeline. Entry and exit criteria defined from day one.
Business-driven test scenarios reflecting real user journeys, edge cases, and regulatory obligations — not just what the developer tested.
Structured defect logging, severity classification, root cause analysis, and retest management — ensuring no defect is lost.
Clear, stakeholder-ready status reports every day. Progress against plan, open defect risk, and confidence indicators — always in your language.
Intelligent regression cycle management ensuring fixes don't introduce new issues — AI-assisted risk-based prioritisation.
Formal sign-off documentation, exit report, and stakeholder recommendation — independent assurance needed to proceed with confidence.
Alongside UAT, Callibers delivers expert BAT-Business Acceptance Testing support — validating that the delivered solution genuinely meets business operational requirements. BAT bridges the gap between what was built and what the business actually needs from day one.
Delivering quality technology services across sectors where precision and reliability are non-negotiable.
Banking, insurance, and fintech platforms requiring rigorous compliance and quality assurance.
Patient-critical systems, clinical platforms, and regulated environments.
Consumer-facing platforms where performance, reliability, and UX are business-critical.
Government and public service platforms requiring rigorous testing and transparent delivery governance.
Fast-moving product teams that need embedded QA capability and agile delivery support.
Complex infrastructure projects, network platforms, and customer-facing digital services.
Smart metering, grid management, and regulated energy platforms where data integrity and uptime are non-negotiable.
Policy management, claims platforms, and digital broker systems requiring deep end-to-end validation.
Warehouse management, transport systems, and real-time platforms where reliability drives operational efficiency.
Learning management systems and student platforms requiring accessible, reliable, and secure digital experiences at scale.
Sustainable performance starts with people who are supported, trusted, and given the space to thrive — professionally and personally.
At CALLIBERS, we believe that balance is not a benefit — it is a foundation. We cultivate an environment where flexible working, continuous learning, and genuine wellbeing come standard, enabling our people to deliver exceptional outcomes without compromising on the life they want to live.
We operate with flexibility as a default. Our people structure work around outcomes, enabling focused delivery and genuine personal time.
Our distributed model keeps teams connected and productive without the constraints of a fixed office location.
Realistic timelines, clear expectations, and collaborative planning protect our people and the quality of our delivery.
Upskilling pathways in cloud, AI, and data keep careers dynamic — without sacrificing personal time or wellbeing.
Open conversations about wellbeing are encouraged. Our leadership leads by example in prioritising health over output metrics.
Our people are trusted to own their work and recognised for their results — empowered to shape how we operate and grow.
Gayathri Manivannan
Founder & Director
Callibers was founded by Gayathri Manivannan, a seasoned technology leader with international exposure spanning India, the USA, and Ireland — bringing a truly global perspective to quality assurance, delivery, and talent solutions.
Academic credentials include a Bachelor's in Computer Science, a Master of Computer Applications (MCA) from India, and a Master's in Big Data Management & Analytics from Ireland — bridging deep technical knowledge with modern data intelligence.
With a career spanning multiple roles across the full technology lifecycle, the Founder brings hands-on expertise that few can match:
Worked across India, USA, and Ireland — bringing multi-market perspective to every engagement and placement.
BSc Computer Science, MCA (India), and MSc Big Data & Analytics (Ireland) — rigorous academic foundations.
From Tester to Delivery Lead — QA, UAT, BA, PM, Agile, ITIL, and Sales expertise across the full lifecycle.
Every engagement shaped by a personal commitment to outcomes, quality, and long-term value — not just outputs.
We deliver end‑to‑end technology excellence — from software development and rigorous testing to UAT support, maintenance, and continuous process improvement — ensuring organisations achieve uncompromising quality, operational resilience, and confident delivery across every programme.
Ireland — Base · 🌍 Global Support
Monday – Friday, 9:00am – 5:30pm (EST)