Siim Haugas - Founder & Full-Stack Product Engineer

Social profiles

Startup links

01. superscribe.io 02. bilanss.io 03. x11.social 04. voxconvo.com

const profile = {

location: "Tallinn, Estonia",
position: "senior hands-on product engineer",
builds: "web, backend, mobile, desktop, AI/ML, infra",
shipping: "superscribe, bilanss, x11, voxconvo",
hosting: "self-hosted, end to end",
experience: "two decades building software",
availability: "busy, but worth asking"

};

About

Founder and full-stack product engineer with two decades of hands-on software development experience across freelance development, product engineering, and technical consulting. I build complete products end to end: frontend, backend, APIs, mobile and desktop clients, automation, product workflows, and the infrastructure needed to run them.

My main focus is Superscribe: it writes the notes, tasks and CRM entries from calls on your own iPhone number, with no bot on the line. The newest product is Bilanss, agentic bookkeeping for small Estonian companies: accountant agents keep the books, and the phone app scans receipts and checks where needed. I also build x11.social and VoxConvo, and ship small fun projects on the side. Everything runs self-hosted end to end.

I like owning messy systems directly: product, engineering, onboarding, infrastructure, deployment, and the small operational details that make a workflow useful. Prior Web3 experience includes a lead developer role on PopSpot, a Polygon-based social product with Solidity contracts, wallet flows, GraphQL APIs, event syncing, and mobile/web clients. Recent AI/ML work includes private sales-call automation, production-domain paper and format models, BI/reporting systems, AI training dataset pipelines, local X/Twitter scoring tools, and trading-model research with tick-bar backtests.

Current focus

main focus / founder / iPhone + desktop Superscribe main

Hang up, the notes are done. Call notes on your own number with no meeting bot: notes, tasks, follow-ups and the Pipedrive entry are written while you are already on the next call.

newest / founder / web + iOS Bilanss new

Agentic bookkeeping for small Estonian service businesses. Accountant agents match invoices, receipts and bank transactions; the phone app scans receipts and checks where needed. A first-time founder can get it going in minutes.

Selected work

self-hosted product / founder-built x11.social

Grow your X account by just talking. Voice-first drafting, scheduling, virality scoring and analytics, with an MCP server and API for agents.

self-hosted product / founder-built voxconvo.com

A home for voice notes and everyday vlogs. Record, refine and share the moments that sound like you.

private product / AI voice automation AI sales voice system

Telemarketing and sales-call automation with SIP/WebRTC calling, live transcription, VAD, LLM conversation flow, streaming TTS, call recordings, and custom Estonian voice-model work.

private product / ERP + agents Print-house operations system

Quoting, orders, production planning and email-to-bid agents in one system, backed by trained paper and format matching models.

Fun projects

siim@haugas.dev:~$ ls -l ~/fun

snipehour.lol live Nightly fight for a launch homepage. From 01:00 UTC shots cost $1, the clock dies at a secret second, and each night draws a different game. brandmywatch.com live Thirty-seven circles on my Apple Watch home screen, all for sale. Obviously a joke: one-shotted with Fable to ride the brandmymacmini wave. scoreboar/ gh Chrome extension that scores X posts and drafts with a local ONNX model: virality, clarity, slop and clickbait signals. Open source on GitHub.

Capabilities

End-to-end products

Frontend, backend, APIs, data models, desktop/mobile clients, integrations, and product polish.

Infrastructure and automation

Self-hosted services, deployment, observability, background jobs, workflow automation, and APIs.

AI agents and voice

Scoped tool-using agents, real-time speech-to-text, SIP/WebRTC audio, LLM call agents, streaming TTS, and Estonian voice model work.

Business intelligence

Operational reports, analytics views, business metrics, dashboards, and visibility layers for messy production workflows.

Training-data pipelines

Dataset cleanup, joins, labeling support, feature extraction, domain-specific training sets, and evaluation loops for AI models.

Prior Web3

Solidity, Polygon, wallet UX, GraphQL APIs, event-driven backend systems, and contract event syncing.

Experience

01.

Haugas Development

2014 - today

Founder / freelance full-stack product engineer

Freelance software development, technical consulting, and founder-led product work across Superscribe, Bilanss, x11.social, AI voice workflows, trained speech models, production automation, business intelligence, data engineering, domain-specific ML, APIs, backend systems, frontend clients, self-hosted infrastructure, and workflow tooling.

Accounting agents

Bilanss agentic bookkeeping

Shared GraphQL API behind a React dashboard, a native SwiftUI app and scoped accountant agents. PostgreSQL keeps the books, original-document metadata, durable jobs and a full audit history.

TypeGraphQLPrismaPostgreSQLSwiftUIagentsaudit trail

ERP / agents

ERP automation and domain models

Turned quoting, orders, worksheets, production planning, worklogs, machine events, warehouse/materials, compliance workflows, integrations, and AI-assisted email-to-bidding into one operations system. Trained domain-specific models for paper and format matching, then blended those predictions into agent-driven automation flows.

ReactGraphQLNode/TypeScriptpaper matchingformat matchingagentsEUDR

BI

Business intelligence and reporting

Built reporting layers, analytics views, business metrics, and operational visibility for production workflows, orders, worklogs, transactions, and internal decision-making.

reportsanalyticsdashboardsmetricsdata cleanup

Training data

AI training-data pipelines

Prepared, cleaned, joined, and structured datasets for AI model training, including feature extraction, domain-specific training sets, and evaluation loops for paper/format matching, voice, scoring, and trading-model experiments.

dataset prepETLfeature extractionlabelingmodel evaluation

Voice stack

AI sales voice and model work

Built private sales-call automation from outbound dialing to live transcription, speech detection, LLM turn-taking, streaming TTS, recordings, Estonian ASR experiments, and voice synthesis/model training.

SIP/WebRTCVADASRLLM callsstreaming TTSStyleTTS2

Market ML

Trading research and backtesting lab

Built a trading-bot research stack around tick bars, order-flow features, Wyckoff-style setup detection, walk-forward/backtest validation, and Mamba-style sequence models. Validation artifacts include long-side AUC above 0.73 and broader risk/expectancy experiments.

tick barsMambaAUC > 0.73backtestswalk-forwardrisk controls

X scoring

X scorer model and Chrome extension

Built a local-model Chrome extension for scoring X/Twitter posts and composer drafts, combining virality, clarity, novelty, shareability, authenticity, slop/clickbait/rage/context signals, feed badges, composer hints, and local ONNX inference.

Chrome MV3ONNXModernBERTvirality scoringcomposer hintsfeed badges

02.

PopSpot

Sep 2022 - Mar 2023

Lead developer

Worked on a Web3 social product, covering dApp backend code, user-facing interfaces, Solidity/Polygon integration, token-style reward mechanics, wallet flows, GraphQL/Apollo APIs, ethers integrations, contract event syncing, MongoDB, Redis subscriptions, Arweave uploads, push notifications, and mobile/web clients.

SolidityPolygonOpenZeppelinHardhatWalletConnectGraphQLArweave

03.

Zlick

Feb 2017 - Nov 2021

Early platform developer

Early developer on Zlick's mobile micropayment platform, focused mostly on direct carrier billing: zero-click payment flows, merchant/public APIs, SDK integrations, carrier services, portal/admin tooling, refunds, subscriptions, metrics, and serverless infrastructure.

direct carrier billingSDKspublic APIsserverlessrefundssubscriptionscarrier integrations

04.

Finestmedia

2012 - 2017

Full stack developer

Built web products with JavaScript frontends including Angular, Ionic, and Meteor, plus backend systems with Node.js, Express, .NET, and Episerver Commerce.

05.

Early web development

2007 - 2012

General web developer

Built custom websites, e-commerce projects, campaign pages, and early interactive web apps across PHP, Python/Django, Magento, OpenCart, Flash/ActionScript, and early Node.js experiments.