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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesManagement ConsultingZugCallista Services GmbH
Callista Services GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Callista Services GmbH is a Swiss consulting company focused on Data Engineering, Agentic Engineering, and legacy modernisation. The company builds and modernises enterprise data platforms, ETL and lakehouse architectures, and related IT systems, supporting projects from analysis through to production.

AI-generated
Offering

Products & services

Industry:Management Consulting
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3.9/5

Callista Services GmbH

✓ Offered
5
Data Engineering
DWH migrations and lakehouse transitions, cloud data lakehouses, data governance and data strategy, as well as data products for banks, insurers and financial services providers.
Legacy Modernization
Analysis, migration and documentation of legacy systems, replacement of ETL, DWH migration, code migration and move to modern cloud and lakehouse architectures.
Agentic Engineering
AI agents to accelerate requirements, architecture, coding, testing and DevOps; with documented methodology, audit trail and handover to internal teams.
Engineering Enablement
Enablement program for internal teams with readiness assessment, tool setup, application phases and certificate; building own AI ambassadors and handover without dependency.
Agentic Sprint
Two-week, clearly scoped engagement with an ongoing prototype, architecture documentation and decision basis for the next step.
Trust & reputation

ranQ Trust Score of Callista Services GmbH: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 96% · As of October 2026

Callista Services GmbH scores 63.6 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
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CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.59.224%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.68.910%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.70.08%
Callista Services GmbH scores 65.0 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.58.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.55.07%
Callista Services GmbH scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).85.022%
Callista Services GmbH scores 82.9 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.82.94%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Callista Services GmbH reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 4.1 out of 5 stars from 14 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.1
of 5

Aggregated from 14 reviews across all connected sources

Sources
GGoogle4.114
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Knowledge

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Comparisons

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Location

General-Guisan-Strasse 8
6300 Zug
Opening hours
Mon
08:00 - 17:00
Tue
08:00 - 17:00
Wed
08:00 - 17:00
Thu
08:00 - 17:00
Fri
08:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-455.252.369
Founded
2022 · 4 years
Last commercial register change
November 6, 2025
Employees
1 to 10
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
88.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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