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Localization Engineering InfrastructureTurn any LLM into a stateful translation APIConfigure per-locale models, glossaries, brand voice, and quality scoring. Call from backend code, CLI, or CI/CD pipelines.Read the DocsCreate Localization Engine0 GitHub stars·0 Discord communityTrusted by fast-growing global companies100M+ words translated on the platform/Sub-second latency/Engineering-led support/SOC 2 Type 2PlatformLocalization engineering infrastructureFive integration patterns. Localize content in real time, detect languages, queue background jobs, receive results via webhooks, or stream progress over WebSocket.LocalizeDetectQueueWebhooksWebSocketProvisionPOST /process/localizeTranslate key-value data via HTTP. Engine applies glossary, brand voice, and model config automatically.Learn moreconst response = await fetch("https://api.lingo.dev/process/localize", { method: "POST", headers: { "X-API-Key": process.env.LINGO_API_KEY, "Content-Type": "application/json", }, body: JSON.stringify({ sourceLocale: "en", targetLocale: "de", data: { welcome: "Welcome to our platform", cta: "Start your free trial", }, }), }); const { data } = await response.json(); // data.welcome => "Willkommen auf unserer Plattform" // data.cta => "Starten Sie Ihre kostenlose Testversion"“Developer experience is everything in developer tools. Lingo.dev nails it - they've turned complex localization into a few lines of code.”Paul CopplestoneCEO & Co-Founder, SupabaseBuilt for ScaleLocalization that never becomes the bottleneckSub-second API responses at any volume. From your first translated string to your hundred millionth.0+words translated on the platform99.9% uptime SLA/Sub-second latency/14 locales per request/300+ modelsArchitectureStateful translation APIA translation API that remembers your content. Glossary terms, brand voice, linguistic rules - configured once, enforced on every request.Original contentenConfigure via MCPor provision via API / DashboardLocalization EngineGlossariesAccount → BenutzerkontoDan Cooper → Gerald WagnerGot it → わかりました+248 entriesService Store → don't translate+34 non-translatablesBrand VoicesFormal "Sie" (de)Polite です/ます (ja)+15 localesInstructionsEnforce ICU pluralizationMatch source length+23 rulesLocalization enrichment🇩🇪 de-DEAccount → BenutzerkontoFormal "Sie"Anthropic🇯🇵 ja-JPService Store → keepPolite です/ますOpenAI🇸🇦 ar-SAAccount → حسابRTL layoutMistral+47 locales🇩🇪🇯🇵🇸🇦Localized contentQuality checkasyncPress enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.Localization EnrichmentEach request triggers semantic search across glossaries, brand voices, and instructions. Only relevant context is injected into the prompt. Cosine similarity over vector embeddings for context-aware term retrieval.300+ ModelsPer-locale model selection with ranked fallback chains. Primary model fails, fallback takes over automatically. Switch providers without code changes.Quality ScoringCross-model evaluation after each translation. One model translates, another scores - eliminating self-assessment bias. Configurable sampling rates per engine.“Now with Lingo.dev, our engineers don't even think about localization. They just build features, and translations happen automatically in 36 languages.”Keith WilliamsHead of Engineering at Cal.com“With Lingo.dev, Dutch reads naturally, Russian fits our UI perfectly, and our brand voice stays consistent.”Sebastiaan van LeeuwenProduct Manager, TruelyEnterpriseLocalization Engineering PlatformLocalization job processing with 99.9% uptime SLA and automatic failover. Autopilot translation with configurable human checkpoints and integrations. SOC 2 Type 2 audited, AES-256 encryption, DPA on request.EngineeringBackground queuesDurable background workflows process each locale independently. Automatic retries, failure isolation, and webhook delivery with signature verification.Sub-second localizationLocalization API returns translations in under one second. Ranked model fallback chains with automatic failover. 99.9% uptime SLA.Global availabilityMulti-region infrastructure. Requests routed to the nearest edge. Consistent sub-second response times across every geography.LocalizationAutopilot with checkpointsThe pipeline runs automatically. Configure review stages per engine. Approve translations individually or in bulk. Skip review when speed matters.Human-in-the-loopAI translates end-to-end. Linguists step in at configurable checkpoints: source review, translation approval, or final sign-off before shipping.Feedback triageConnect your Jira board. AI triages incoming translation feedback, suggests fixes for valid issues, and filters noise so your team focuses on what matters.SecuritySOC 2 Type 2Audited security controls. Encryption at rest and in transit. DPA available on request.Data encryptionAll data encrypted with AES-256 at rest and TLS in transit. API keys hashed at the application layer. Data residency options for EU and US regions.Dedicated engineering supportDirect access to the engineers building the platform. Y Combinator-backed team shipping weekly. Priority support channel via Slack.Ask about Lingo.dev EnterpriseSOC 2 Type 2/Global Availability/Dedicated SupportEcosystemCommunity toolsThree developer tools maintained by a 5,000+ star open-source community.0 stars0 membersLingo React MCPOne prompt to full i18n setupLingo CLIFirst localized build in 4 minutesLingo GitHub ActionContinuous localization on every pushLingo React MCPOne prompt to full i18n setupMCP docs$ claude mcp add --transport http "lingo-react" https://mcp.lingo.dev/main Added lingo-react MCP server $ claude> Set up i18n for this Next.js app  ✓ Detected Next.js with App Router ✓ i18n routing configured ✓ Locale switcher added ✓ Translation files created  Localization setup complete. Run Lingo CLI to add new languages.+“Just like Dependabot made package updates effortless through automation, Lingo.dev is doing the same for localization.”Grey BakerCreator of DependabotCreate your first localization engineFirst quality LLM translation in under 2 minutes. Free credits included.Read the DocsCreate Localization Engine --- Localization Engineering InfrastructureTurn any LLM into a stateful translation APIConfigure per-locale models, glossaries, brand voice, and quality scoring. Call from backend code, CLI, or CI/CD pipelines.Read the DocsCreate Localization Engine0 GitHub stars·0 Discord communityTrusted by fast-growing global companies100M+ words translated on the platform/Sub-second latency/Engineering-led support/SOC 2 Type 2PlatformLocalization engineering infrastructureFive integration patterns. Localize content in real time, detect languages, queue background jobs, receive results via webhooks, or stream progress over WebSocket.LocalizeDetectQueueWebhooksWebSocketProvisionPOST /process/localizeTranslate key-value data via HTTP. Engine applies glossary, brand voice, and model config automatically.Learn moreconst response = await fetch("https://api.lingo.dev/process/localize", { method: "POST", headers: { "X-API-Key": process.env.LINGO_API_KEY, "Content-Type": "application/json", }, body: JSON.stringify({ sourceLocale: "en", targetLocale: "de", data: { welcome: "Welcome to our platform", cta: "Start your free trial", }, }), }); const { data } = await response.json(); // data.welcome => "Willkommen auf unserer Plattform" // data.cta => "Starten Sie Ihre kostenlose Testversion"“Developer experience is everything in developer tools. Lingo.dev nails it - they've turned complex localization into a few lines of code.”Paul CopplestoneCEO & Co-Founder, SupabaseBuilt for ScaleLocalization that never becomes the bottleneckSub-second API responses at any volume. From your first translated string to your hundred millionth.0+words translated on the platform99.9% uptime SLA/Sub-second latency/14 locales per request/300+ modelsArchitectureStateful translation APIA translation API that remembers your content. Glossary terms, brand voice, linguistic rules - configured once, enforced on every request.Original contentenConfigure via MCPor provision via API / DashboardLocalization EngineGlossariesAccount → BenutzerkontoDan Cooper → Gerald WagnerGot it → わかりました+248 entriesService Store → don't translate+34 non-translatablesBrand VoicesFormal "Sie" (de)Polite です/ます (ja)+15 localesInstructionsEnforce ICU pluralizationMatch source length+23 rulesLocalization enrichment🇩🇪 de-DEAccount → BenutzerkontoFormal "Sie"Anthropic🇯🇵 ja-JPService Store → keepPolite です/ますOpenAI🇸🇦 ar-SAAccount → حسابRTL layoutMistral+47 locales🇩🇪🇯🇵🇸🇦Localized contentQuality checkasyncPress enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.Localization EnrichmentEach request triggers semantic search across glossaries, brand voices, and instructions. Only relevant context is injected into the prompt. Cosine similarity over vector embeddings for context-aware term retrieval.300+ ModelsPer-locale model selection with ranked fallback chains. Primary model fails, fallback takes over automatically. Switch providers without code changes.Quality ScoringCross-model evaluation after each translation. One model translates, another scores - eliminating self-assessment bias. Configurable sampling rates per engine.“Now with Lingo.dev, our engineers don't even think about localization. They just build features, and translations happen automatically in 36 languages.”Keith WilliamsHead of Engineering at Cal.com“With Lingo.dev, Dutch reads naturally, Russian fits our UI perfectly, and our brand voice stays consistent.”Sebastiaan van LeeuwenProduct Manager, TruelyEnterpriseLocalization Engineering PlatformLocalization job processing with 99.9% uptime SLA and automatic failover. Autopilot translation with configurable human checkpoints and integrations. SOC 2 Type 2 audited, AES-256 encryption, DPA on request.EngineeringBackground queuesDurable background workflows process each locale independently. Automatic retries, failure isolation, and webhook delivery with signature verification.Sub-second localizationLocalization API returns translations in under one second. Ranked model fallback chains with automatic failover. 99.9% uptime SLA.Global availabilityMulti-region infrastructure. Requests routed to the nearest edge. Consistent sub-second response times across every geography.LocalizationAutopilot with checkpointsThe pipeline runs automatically. Configure review stages per engine. Approve translations individually or in bulk. Skip review when speed matters.Human-in-the-loopAI translates end-to-end. Linguists step in at configurable checkpoints: source review, translation approval, or final sign-off before shipping.Feedback triageConnect your Jira board. AI triages incoming translation feedback, suggests fixes for valid issues, and filters noise so your team focuses on what matters.SecuritySOC 2 Type 2Audited security controls. Encryption at rest and in transit. DPA available on request.Data encryptionAll data encrypted with AES-256 at rest and TLS in transit. API keys hashed at the application layer. Data residency options for EU and US regions.Dedicated engineering supportDirect access to the engineers building the platform. Y Combinator-backed team shipping weekly. Priority support channel via Slack.Ask about Lingo.dev EnterpriseSOC 2 Type 2/Global Availability/Dedicated SupportEcosystemCommunity toolsThree developer tools maintained by a 5,000+ star open-source community.0 stars0 membersLingo React MCPOne prompt to full i18n setupLingo CLIFirst localized build in 4 minutesLingo GitHub ActionContinuous localization on every pushLingo React MCPOne prompt to full i18n setupMCP docs$ claude mcp add --transport http "lingo-react" https://mcp.lingo.dev/main Added lingo-react MCP server $ claude> Set up i18n for this Next.js app  ✓ Detected Next.js with App Router ✓ i18n routing configured ✓ Locale switcher added ✓ Translation files created  Localization setup complete. Run Lingo CLI to add new languages.+“Just like Dependabot made package updates effortless through automation, Lingo.dev is doing the same for localization.”Grey BakerCreator of DependabotCreate your first localization engineFirst quality LLM translation in under 2 minutes. Free credits included.Read the DocsCreate Localization EngineSign inSign upTalk to Sales --- PlatformAPIReact (MCP)React (Lingo Compiler)AlphaCLIIntegrationsGuidesChangelogThe Localization Engineering PlatformMax Prilutskiy·Updated 16 days ago·2 min readLingo.dev is an AI-powered localization engineering platform. It helps product engineers turn LLMs into stateful translation APIs - to produce consistent, production-grade translations for apps, docs, and content across every language.Context and Localization Engineering#Using LLMs for translation is obvious. Any team can send a string to a model and get a translation back. What makes translations perfect is two things: context and localization engineering.Context is what the model knows beyond the string itself - the product, the audience, the brand voice, the locale-specific conventions. Without it, the model guesses. With it, the model localizes.Localization engineering is the practice of encoding that context into reproducible infrastructure - glossary rules, formality preferences, cultural adaptations - so every translation, across every locale, applies them consistently.Without both, you get translations. With both, you get localization.The Problem#Before LLMs, teams had two options - both flawed.Machine translation was fast but structurally incapable of understanding product context. Teams shipped MT output knowing it would erode trust in every market.Manual translation was accurate but scaled linearly. Every new locale required training linguists on product terminology, brand voice, and domain concepts. After processing 100M+ words across 42 languages, we found that 89% of localization delays happen in handoffs between teams, not in translation itself.Both treated localization as a project management workflow. Lingo.dev treats it as an engineering concern.What You Build#On Lingo.dev, teams build their own localization engines. Each engine combines:LLM models per locale - Pick the right model for each language pair with ranked fallbacks.Brand voice - Define how your product speaks per language. Formal "Sie" in German, informal "tu" in Italian, polite "vous" in French.Glossary - Map source terms to exact translations per locale. "911" becomes "112" for European markets. Product names stay untranslated.Instructions - Encode linguistic rules generic models miss. Adjective positioning in Spanish, space before percentage signs, pronoun formality per market.Quality scoring - GEMBA scores, BERTScore, glossary compliance, locale-specific validators. Continuous, automatic.The result: teams use their own unique insights and preferences - combined with Lingo.dev's language engineering research, ongoing since 2023 - to scale globally from day one, predictably, in languages they don't speak.Open Source Developer Tools#The Lingo.dev open-source community (5,100+ GitHub stars) builds developer tools that connect codebases to localization engines:CLI - Translate from the command line. From install to first translated build in 4 minutes.CI/CD - GitHub Actions, GitLab CI, Bitbucket Pipelines. Translations ship with your code.Compiler - Build-time i18n. No runtime overhead, no layout shift.I18n MCP - Localization awareness for AI coding assistants: Claude Code, Cursor, GitHub Copilot.Next Steps#Localization EnginesLearn how engines combine models, glossaries, brand voice, and scoringAI ReviewersSet up automated translation quality monitoringCLI Quick StartInstall the CLI and run your first translationAPI ReferenceIntegrate the localization API into your workflowWas this page helpful?YesNo --- PricingLocalization for developersand enterprisesStart free with generous limits. Go to production with custom volume-based pricing, dedicated support, and full platform access.DeveloperFreeFor tinkerers and OSS projectsStart BuildingEnterpriseCustomFor production and platform useTalk to SalesUsageBase price$0CustomLLM costPass-throughPass-throughLingo.dev infrastructure$2/MTokCustomCost per engine/moCustomRate limits20 req/min, 100K tok/dayCustomPlatformEngines1Custom (incl. provisioning API)Seats3UnlimitedGlossary items50UnlimitedIntegrationsCommunityUnlimitedRolesAdminConfigurableData retention7 daysCustomAPIsSync APIAsync API3 locales/jobManagement API / MCPWebhooksQualityAI ReviewersUnlimitedHuman expert reviewReportsFullLocalization IDESoonSecuritySSOBYOKStart BuildingTalk to Sales