ProCat Solutions
Engineering notes from the ProCat Solutions workshop: backend, telecom, Voice AI and everything we learned along the way.
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Our DIMOP Plusz project has closed: the phone assistant and the AI language teacher are live at abigel.ai. Lessons on latency, streaming and telephony.
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How the Virtual Assistant voice pipeline became a language teacher: 26 languages, A1-B2 levels, real-life scenarios, KIDS mode and instant correction.
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Step by step: sign-up, industry template, the no-code flow, call forwarding with the *61* code, a test call, transcripts, CSV export and the referral program.
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MCP, tool use, planner/worker and handoff patterns, guardrails, human-in-the-loop, tracing: when a multi-agent system pays off and when a workflow is enough.
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Under the DIMOP_PLUSZ-1.1.2/A-24 call we are building a multi-tenant voice AI customer service platform with HUF 14.53 million of funding, until autumn 2026.
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The Abisearch vector search API: embeddings instead of keywords, Hungarian morphology, JSON and Excel upload, re-ranking, EU data centre and a free tier.
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Exchange REST and WebSocket APIs, order lifecycle, rate limits, risk controls and monitoring: engineering lessons from building crypto trading bots.
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Building a real-time voice AI agent: streaming STT, LLM and TTS, a latency budget, jitter buffers, SIP and WebRTC media, and Hungarian language specifics.
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A Solidity and OpenZeppelin token presale with whitelist and referrals, gas on Polygon and Arbitrum, an Ethers.js backend, testing, audits and takeaways.
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The WhatsApp Cloud API in practice: templates and approval, the 24-hour window, webhooks, a shared inbox with SMS and voice, chatbot flows and GDPR.
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GSM modem pools, AT commands, SIM management, delivery reports, message queues, combining SMS with voice, and when an aggregator is the better choice.
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Our first months with SIP telephony: codecs, NAT and RTP pitfalls, SIP trunks, the PSTN bridge, IVR, call routing, WebRTC and call quality metrics.
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Tenant isolation models, row-level security, per-tenant configuration in the database, migrations, noisy neighbours, billing hooks and backups in a SaaS.
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Node.js and NestJS APIs under production load: PostgreSQL indexing, connection pooling, Redis caching, rate limiting, idempotency and observability.
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The first post from a Budapest micro-company: why we build around infrastructure, secure APIs and high availability instead of feature lists.
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