Case study
15,000+ hours of audio transcription across 60+ rare languages
This is not a single project. It is a standing transcription operation serving multiple AI-focused companies through LSP partners. 15,000+ hours of audio transcription across 60+ rare languages, delivered in weekly batch cycles with project-scoped quality review. The operation runs continuously, with new languages onboarded through a templated process that gets production-ready after scoped review.
15,000+ hours of audio - Weekly batch cycles
110,000+
verified language specialists
300+
languages across active service lines
4,500+
dialects and regional variants
110+
rare and indigenous language pairs
1,000+
brands served since 2015
Measured outcomes
Audio transcription standing operation
Project overview
What landed, and what made it hard.
This is not a single project. It is a standing transcription operation serving multiple AI-focused companies through LSP partners. 15,000+ hours of audio transcription across 60+ rare languages, delivered in weekly batch cycles with project-scoped quality review. The operation runs continuously, with new languages onboarded through a templated process that gets production-ready after scoped review.
Delivery snapshot
Audio transcription standing operation
- Client
- Multiple AI-focused companies (via LSP partners)
- Service
- Audio Transcription
- Volume
- 15,000+ hours of audio
- Delivery
- Weekly batch cycles
Why this mattered
Outcome before process.
The problem to solve
Why the work was difficult, and what MoniSa changed in-flight.
AI companies building speech recognition and natural language processing models need transcribed audio data in hundreds of languages. The high-resource languages, English, Spanish, Mandarin, have mature transcription infrastructure. The rare languages do not. When a client needs transcribed audio in Fanti, Chadian Arabic, Tok Pisin, or Teso, the typical vendor response is silence or a slow sourcing response.
The challenge
The problem to solve
Scale was only the first constraint. It is consistency at scale. 15,000+ hours of audio across 60+ rare languages means managing hundreds of transcribers working in different scripts (Latin, Arabic, Bengali, Cyrillic), different audio quality conditions, and different transcription conventions. A single transcriber using the wrong orthographic convention in Chadian Arabic can contaminate an entire training dataset.
Clients need weekly delivery cadence. Not monthly. Not "when ready." Every week, a batch ships. If a language pair cannot meet the weekly window, the client's ML training pipeline stalls.
Operating response
What MoniSa changed
We built this operation for repeatability. Every new language pair follows the same onboarding template. Every batch follows the same QA sequence. The system runs whether the language is Fanti or French.
- Templated new-language onboarding: When a new language is requested, we follow a documented playbook: source 3-5 candidate transcribers, run a paid test batch (2-3 hours of audio), evaluate against accuracy and formatting benchmarks, select the top performers, and brief them on project-specific guidelines. This process takes a scoped onboarding window for most languages. For extremely rare languages, up to 10 days.
- Script-specific QA checklists: We maintain four separate QA frameworks — one each for Latin, Arabic, Bengali, and Cyrillic scripts. Each checklist covers script-specific risks: diacritical mark accuracy for Arabic, conjunct character validation for Bengali, transliteration consistency for Cyrillic-to-Latin pairs, and tone marking for applicable Latin-script languages.
- Double-blind review for first batches: The first two batches from any new transcriber go through double-blind review. Two independent reviewers assess the same audio segment without seeing each other's output. Disagreements are resolved by a senior linguist. This catches calibration issues before they become systemic.
- Weekly batch delivery with quality gates: Every weekly batch passes through three checkpoints before delivery: transcriber self-review, independent QA reviewer check, and project manager sign-off with spot-check sampling. Batches that fail any checkpoint are held and reworked before the next delivery window.
- Partner coordination layer: Since this operation serves multiple end clients through LSP partners, we maintain a coordination layer that manages project-specific requirements (annotation guidelines, formatting specs, metadata fields) per partner without cross-contaminating data between clients.
Results
Measured outcomes from this engagement.
The operation continues to expand. New language pairs are added regularly through the templated onboarding process. Partner feedback consistently cites two things: the ability to add rare languages without extended sourcing delays, and the consistency of output quality across batch cycles.
| Volume delivered | 15,000+ hours of audio transcribed |
|---|---|
| Total languages | 60+ (majority rare/low-resource) |
| Script systems | 4 (Latin, Arabic, Bengali, Cyrillic) |
| Accuracy | project-scoped quality review |
| Delivery cadence | Weekly batch cycles |
| New-language onboarding | a scoped onboarding window (templated) |
| QA methodology | Script-specific checklists + double-blind first-batch review |
Selection logic
What protected the result.
The selection came down to whether MoniSa could source and review the work at standard, and whether that would hold across the full run.
Why the fit was real
Why the fit was real
LSP partners needed a production backbone that could handle rare languages they could not source in-house — Fanti, Chadian Arabic, Tok Pisin, Teso — without the partners losing control of the client relationship. MoniSa operates as a white-label production layer: the partner's brand, our production.
Why the result held
Why the result held
Templated onboarding for new languages (3-5 days for most, 10 for extremely rare) plus script-specific QA frameworks meant the operation could absorb new language requests without rebuilding the pipeline each time. That repeatability is what turns a one-off project into a standing operation.
What buyers can reuse
What buyers can reuse
- Standing operations require templated processes, not hero efforts. The difference between a one-off transcription project and a 15,000+ hours of audio standing operation is repeatability. Documented onboarding, standardized QA checklists, and weekly delivery rhythms turn rare-language transcription from a sourcing problem into an operational process.
- Script-specific QA catches errors that generic checklists miss. A single QA template across Arabic, Bengali, Cyrillic, and Latin scripts would miss half the errors. Each script system has its own failure modes. Separate checklists per script system are not optional at this scale.
- Double-blind review on first batches prevents downstream data contamination. For AI training data, a calibration error in batch 1 that goes undetected propagates through every subsequent batch. The cost of double-blind review on the first two batches is a fraction of the cost of reprocessing contaminated training data.
- Partner coordination at this scale requires project-level data isolation. Serving multiple end clients through LSP partners means annotation guidelines, formatting specs, and metadata fields cannot bleed across projects. Separate secure workspaces per client are not a security nicety. They are an operational requirement when one mis-routed file can violate an NDA.
Continue from this proof
Useful comparisons for the same problem.
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Mapped context
Service and buyer context
Languages named
Examples referenced in the engagement.
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Buyer questions
Ask the questions weak vendors avoid.
Short answers for buyers checking fit, coverage, quality method, and next-step readiness.
What was delivered on this engagement?
Volume delivered: 15,000+ hours of audio transcribed. Total languages: 60+ (majority rare/low-resource). Script systems: 4 (Latin, Arabic, Bengali, Cyrillic)
What control kept the work stable?
Templated onboarding for new languages (3-5 days for most, 10 for extremely rare) plus script-specific QA frameworks meant the operation could absorb new language requests without rebuilding the pipeline each time. That repeatability is what turns a one-off project into a standing operation.
Where should similar work go next?
Use Multimedia services for the delivery model, How to Choose an AI Data Annotation Vendor for buyer-side evaluation, and the contact page for a scoped brief.
Similar brief
Send the constraint behind the metric.
A useful follow-up to a case study names the language mix, review model, deadline, and what proof your buyer team needs before approval.
Production-ready brief
01Closest matching challenge from this case02Language pair, dialect, and script coverage03Volume, cadence, or hours to deliver04Reviewer model and acceptance criteria05Security or platform constraints06Proof needed for stakeholder approvalCapability at a glance
The answers most briefs open by asking for.
Buyers rarely start with who we are. They start with a list of fields to fill. Here are ours, so the first email can be about the work instead.
- Languages and locales
- 300+ languages and 4,500+ dialects, quoted per locale rather than per language — because the dialect decides whether a dataset is usable, whether a market accepts a release, and which specialist the work goes to.
- Specialist network
- 110,000+ verified language specialists — linguists, annotators, and reviewers — plus voice talent and subtitlers, matched to the language, domain and task before assignment.
- Capacity and mobilisation
- Named availability confirmed per pair before scoping. Coverage is reported as staffed today or needing a recruitment window, in writing, before a launch date or release window is agreed.
- Sourcing constraints
- Specialists can be sourced against geographic, residency, locale and demographic requirements — including native-only, in-country, and speaker-diversity quotas where a data programme demands them.
- Deliverables and specs
- Work is delivered to the receiving specification: structured formats and schemas for data and annotation work, and timed-text, audio and platform conformance for media — subtitle reading speed, line limits, cue timing, channel and sample-rate requirements included.
- Comparable work
- 62 documented case studies stating the scope, the constraint that made it difficult, and the measured result — across AI data programmes, partner overflow, and media releases. 2,000+ AI projects delivered and 1,000+ brands served since 2015.
- Certifications
- ISO 9001:2015 quality management, ISO 27001:2022 information security, and ISO 17100 translation services — scoped to translation specifically, and stated that way rather than implied across every line.
- Commercial basis
- Quoted in the unit the work is measured in — per word, per audio hour, per approved hour, per finished minute, per batch, per item — with what the unit includes stated alongside it, whether the quote is for you or for a client you quote onward.
Need this against your own template? Convert your scope between units and check the deadline, then send the brief with your language list, content type, volume and deadline, and the acceptance criteria you will judge the output against — those four decide feasibility, and the reply addresses them directly.