# Bitscorp - Small focused senior engineering studio

> A small senior engineering team for startups that need it fixed, not staffed. 15+ years building backends, payment systems, and data platforms in Elixir/Phoenix, Ruby/Rails, Go, Python. Senior-led, hands-on — not a staffing agency. Based in Barcelona (CET timezone), working with clients across Europe and remotely worldwide.

## Who

Bitscorp is a small focused senior engineering studio led by Alex Korsak (Alexandr Korsak). 15+ years experience. Author of devise_masquerade (552★ Ruby/Rails authentication library). The same team ships the work — no body shop, no staffing agency. Specializes in:
- Elixir/Phoenix production systems (hot path extraction, LiveView optimization, Postgres performance)
- Data engineering (Airflow, BigQuery, DuckDB, GDPR/PII pipelines)
- Full-stack modernization (Python/Ruby → Elixir/Go)
- Rescuing AI-built apps (Cursor/Claude projects to production-ready)

Location: Barcelona, Spain (CET/CEST timezone)
Languages: English, Russian
GitHub: https://github.com/oivoodoo
LinkedIn: https://www.linkedin.com/in/alexandr-korsak/

## Starter Packages (fixed-price, this week)

### Phoenix Production Health Check
Duration: 5 days
Price: €2,400 fixed
Read-only review of your Elixir/Phoenix app: slow queries, missing indexes, N+1s, LiveView reconnects, deploy pipeline. Written report + 1–3 fixes merged.
What you get: Postgres review (pghero-elixir), Phoenix/LiveView review (N+1s, PubSub), Deploy/ops health check, Written report (10–20 findings), 1–3 fixes merged as PRs, 45-min walkthrough call
Details: https://bitscorp.co/

### Data Pipeline Audit + 1 Fix
Duration: 1 week
Price: €2,900 fixed
Map every source, job, and table. Find the top failure points. Ship one fix (idempotency, alerts). Architecture diagram + ranked backlog.
What you get: Map sources, jobs, tables, Find duplicates, schema drift, PII exposure, Cost pass (largest queries), One fix shipped (idempotent pipeline), Architecture diagram, Ranked backlog with estimates
Details: https://bitscorp.co/

### AI-Built App → Production
Duration: 2 weeks
Price: €5,500 fixed
You shipped an MVP with Cursor/Claude. Now you have broken auth, no tests, secrets in the repo. We fix the top risks and get you production-ready.
What you get: Security audit (auth, secrets, permissions), Fix top risks (sessions, migrations, jobs), CI + preview deploys, Error tracking & backups, README/runbook, Recorded walkthrough
Details: https://bitscorp.co/

## Services (4-week SKUs and productized offers)

### Full Stack Development
Extract one hot path into Elixir or Go. Leave the rest of the company alone.
Pricing: Full Stack (4 weeks): €12,000 (50% to start, 50% at week-4 demo. Written SOW required.); Full-stack retainer: €3,000/mo (Monthly in advance, three-month minimum. Capacity for the same class of work, not a blank cheque.)
The node that takes the traffic — lobby, matching, payments, fan-out, live board — is still in a request/response stack that was never built for 10k concurrent users. Rewriting the product is a year. Pulling the hot path is a month.
Who it's for: SaaS or marketplace with a websocket, queue, or payment path that pages people at peak; A Ruby/Python/Node API that is fine at 500 users and ugly at 10,000; A founder who has already been told “just add Redis” and it did not hold
Details: https://bitscorp.co/services/full-stack-development

### AI Consulting
A RAG agent on your docs and tickets — not a scripted chatbot.
Pricing: Install: €2,500 (100% to start. No handshake work.); Retain: €750/mo (Monthly in advance. Cancel after month 3. Does not include LocaleOps.)
Your inbox is full of questions that already have answers in the help center, Notion, or last month’s tickets. A junior cannot drain it. A canned bot makes it worse. AI Consulting reads your corpus and replies with citations, then escalates what it cannot answer.
Who it's for: SaaS, ecommerce, or an online school with a real knowledge base; A support lead who can name the ten tickets that repeat every week; A team that will review the first two weeks of answers — not “set and forget” on day one
Details: https://bitscorp.co/services/ai-consulting

### App Launch
You have a build. We get it through review. We do not build your app.
Pricing: Ship: €1,500 (100% to start. One app, iOS + Android. Two clients per month. 20-hour cap.); ASO month: €750 (Monthly in advance. Listing already live. Three clients per month.); Rush (7 days): €2,500 (100% to start. One slot per month. Same deliverable as Ship, compressed.)
Vibe-coded and Expo apps die in Preparing for Submission. Certificates, privacy nutrition, Data safety, 6.7" screenshots, a reviewer who needs a test account. You can write the feature. You cannot ship the listing. That is the job.
Who it's for: A founder with a TestFlight or an internal AAB and no live store page; An indie who can pay €1,500 and invite us to their ASC — not a student asking for free help; Someone who will not ask us to put the app on Bitscorp’s developer team
Details: https://bitscorp.co/services/app-launch

### Data Engineering
One pipeline from your events to a warehouse you own, plus a dashboard of metrics you can defend.
Pricing: Data Engineering (4 weeks): €12,000 (50% to start, 50% at week-4 demo. Written SOW required.); Analytics retainer: €3,000/mo (Monthly in advance, three-month minimum. Pipeline + dashboard upkeep for the frozen metric list, not a blank cheque for new domains.)
DAU lives in three tools and none of them agree. Monday is a CSV. Attribution is a screenshot. You cannot answer which campaign paid back, which cohort stayed, or whether the last release moved retention. A lakehouse programme is a year. A spine — one pipeline, one warehouse, ten metrics — is a month.
Who it's for: A mobile, SaaS, or marketplace team with events in Firebase, ads, Mixpanel, or S3 and no warehouse they trust; A founder who can name 5–10 metrics that would change a decision this quarter — not “we need a data team”; Someone who will give source access in week 1 and will not ask us to invent the product strategy from a dashboard
Details: https://bitscorp.co/services/data-engineering

### DevOps
CI, Kubernetes, rollback, and Prometheus for one product. We do not become your SRE team.
Pricing: DevOps (4 weeks): €12,000 (50% to start, 50% at week-4 demo. Written SOW required.); Platform retainer: €3,000/mo (Monthly in advance, three-month minimum. Capacity for the same cluster and pipeline, not a blank cheque for a second product.)
Production is SSH and hope. The last deploy has no tag. Rollback is a rumour. There is no dashboard, so the first person who notices an outage is a customer. You do not need a platform org. You need one path that builds, ships, and tells you when it is on fire.
Who it's for: A team shipping from a laptop, a fragile GitHub Action, or a single untagged droplet; A founder who will invite us to their cloud account — DigitalOcean, GCP, AWS, or equivalent — and will not ask us to own the billing; Someone who will not ask for 24/7 on-call or a multi-region active-active redesign in the same SOW
Details: https://bitscorp.co/services/devops

## Client case studies

### Blastworks
In-house big data and analytics platform
Designed and built an in-house big data and analytics platform so the team could collect events, process them on AWS, and optimize ad campaigns from owned data.
Stack: Go, Kafka, ELK, Amazon EMR, AWS, AWS Spot, Tableau, Metabase, Airflow, Adjust, CleverTap, Leanplum, Ansible, React, Python
Details: https://bitscorp.co/case-studies/blastworks
Client: https://blastworksinc.com

## Open Source

- **devise_masquerade** (552★ on GitHub): Rails authentication extension for admin user impersonation. https://github.com/oivoodoo/devise_masquerade
- **phoenix_lens**: Repository analytics dashboard and SQL notebook for Ecto with PII masking. https://github.com/oivoodoo/phoenix_lens
- **pghero-elixir**: Postgres performance monitoring for Elixir/Phoenix apps
- **phoenix_healthy**: Health check endpoints for Phoenix applications
- **redis_poolex**: Redis connection pooling for Elixir

GitHub profile: https://github.com/oivoodoo

## Portfolio

Live catalog: https://bitscorp.co/portfolio
Each line is a product Bitscorp ships. App Store and Google Play links are the public listing. Web products link to the live site.

## Mobile Applications

iOS and Android apps we ship: language practice, on-device photo and video tools, and a few utilities. The games have their own section below.

- [Balcony Games](https://balconygames.com): A collection of engaging mobile games developed with Unity and React Native
- [Catalan Verbs](https://play.google.com/store/apps/details?id=co.bitscorp.cat): Language learning app featuring 2000+ Catalan verbs with complete conjugation tables and interactive exercises
- [Palm Reader AI](https://play.google.com/store/apps/details?id=co.bitscorp.palm): AI-powered palm reading app that analyzes and interprets hand lines using advanced algorithms
- [PushUP Workout](https://play.google.com/store/apps/details?id=co.bitscorp.pushup): Fitness tracker app for monitoring daily exercises with goal-setting features and activity analytics
- [Video Cut Lab](https://apps.apple.com/us/app/video-cut-lab/id6801204226): Cuts vertical reels on the iPhone. Clips stay on the device: trim, on-device captions, and a circle reaction, with no account and no upload.
- [Bikes](https://apps.apple.com/us/app/bikes-recognize-ai/id6806223139): Identifies a bicycle from one photo and returns the make, model, specs, and a used-price band. Scans stay on the phone.
- [Shield](https://apps.apple.com/us/app/shield-scam-text-blocker-ai/id6757823397): Blocks scam, phishing, and fraudulent text messages. A subscription turns on the AI filter.
- [Collage Lab](https://apps.apple.com/us/app/collage-lab/id6751143231): Combines photos into grids, Polaroids, honeycombs, stories, and a 12-month baby calendar.
- [Dual Video Shot](https://apps.apple.com/us/app/dual-video-shot/id6761911912): Records the front and back cameras at the same time and saves a split-view clip.
- [Images to Documents](https://apps.apple.com/us/app/images-to-documents/id6749373309): Turns photos into documents, adds a signature, and extracts text with OCR.
- [Sleep Notes AI](https://apps.apple.com/us/app/sleep-notes-ai/id6762139822): A private journal for sleep, dreams, and mood, with AI summaries of recurring themes.
- [LLM API Costs](https://apps.apple.com/us/app/llm-api-costs-widget/id6743623133): An iPhone widget for reviewing OpenAI API spend.
- [VoxDo](https://play.google.com/store/apps/details?id=co.bitscorp.todorecording): A voice to-do list. Speak a task and it lands on today, tomorrow, or a parking list.
- [Healthy Habbits AI](https://play.google.com/store/apps/details?id=co.bitscorp.healthyhabbitsai): Turns a meal photo into a calorie and protein estimate, a plate score, and a workout. The estimate is not a lab measurement, and the app is not medical advice.
- [Tarot Reader AI](https://play.google.com/store/apps/details?id=co.bitscorp.tarot): A tarot reader with a daily card, love and career spreads, and a library of card meanings.
- [Spanish Verbs](https://play.google.com/store/apps/details?id=co.bitscorp.es): Language learning app featuring 2000+ Spanish verbs with complete conjugation tables and interactive exercises
- [French Verbs](https://play.google.com/store/apps/details?id=co.bitscorp.fr): Language learning app featuring 2000+ French verbs with complete conjugation tables and interactive exercises
- [Italian Verbs](https://play.google.com/store/apps/details?id=co.bitscorp.it): Language learning app featuring 2000+ Italian verbs with complete conjugation tables and interactive exercises
- [Portuguese Verbs](https://play.google.com/store/apps/details?id=co.bitscorp.pt): Language learning app featuring 2000+ Portuguese verbs with complete conjugation tables and interactive exercises
- [German Verbs](https://play.google.com/store/apps/details?id=co.bitscorp.de): Language learning app featuring 2000+ German verbs with complete conjugation tables and interactive exercises
- [Catalan Words](https://play.google.com/store/apps/details?id=co.bitscorp.catalanwords): Catalan vocabulary with more than 3,000 high-frequency words, native-speaker audio, and offline practice.
- [Spanish Words](https://play.google.com/store/apps/details?id=co.bitscorp.spanishwords): Spanish vocabulary with more than 3,000 high-frequency words, native-speaker audio, and offline practice.
- [French Words](https://play.google.com/store/apps/details?id=co.bitscorp.frenchwords): French vocabulary with more than 3,000 high-frequency words, native-speaker audio, and offline practice.
- [Italian Words](https://play.google.com/store/apps/details?id=co.bitscorp.italianwords): Italian vocabulary with more than 3,000 high-frequency words, native-speaker audio, and offline practice.
- [Portuguese Words](https://play.google.com/store/apps/details?id=co.bitscorp.portuguesewords): Portuguese vocabulary with more than 3,000 high-frequency words, native-speaker audio, and offline practice.
- [Basque Vocabulary](https://play.google.com/store/apps/details?id=co.bitscorp.basquewords): Basque vocabulary with more than 3,000 high-frequency words, native-speaker audio, and offline practice.

## Web & AI Products

Production web platforms we engineered end to end — crawlers, agents, and the products we run on our own domains.

- [Payblast](https://payblastfs.com/): Subscriptions for iOS, Android, and the web. App Store, Google Play, and Stripe purchases unlock the same entitlement. Free until $2,000 in monthly tracked revenue.
- [Lapsight](https://patents.bitscorp.co/): US patents that expired because a maintenance fee was missed. A weekly ranked list with a score, a follow-on tier, and links back to the USPTO, Google Patents, and Espacenet. Identifying data only.
- [Klaris](https://audit.bitscorp.co/): Phone, email, and IP validation on one credit balance. Lookups are success-billed and cached for seven days, with enrichment you can turn on later.
- [Open IQ](https://iq.bitscorp.co/): Online IQ tests from published items, keys, and norms. ICAR-16, matrices, and an English vocabulary scale. Under 13 sees figures only. The scored report unlocks for $0.99.
- [Antes](https://dele.bitscorp.co/): DELE practice from A1 to C2. Reading, listening, writing, and speaking are marked against Instituto Cervantes papers. Two graded attempts are free.
- [TenderMCP](https://tender.bitscorp.co/): Public-contract desk for the last week of EU TED and Spanish PLACSP notices. Search in the browser, or from a coding agent through the MCP server.
- [LeadPilot](https://leadpilot.bitscorp.co/): Outbound that starts from a company website. It finds buyers, writes a personal email for each, and sends from warmed-up inboxes.
- [Estate Monitor](https://estates.bitscorp.co/): Property listing dashboard for the Catalan market. Multi-source crawler, AI post-processing to normalize and match listings, and a Telegram bot for new-home alerts.
- [LetsBooking](https://letsbooking.bitscorp.co/): Stay search for travelers and AI agents. Natural-language search across Airbnb and Booking.com with total-price ranking, SDKs, an MCP server, and ReAct agent tooling.
- [Poker](https://pokerfs.com): Texas Hold’em in the browser. Open a room and play friends or bots in real time, with no download and no account required.
- [LocalesFS](https://localesfs.com): Translation workspace for the locale files you already ship. AI drafts a first pass, the team reviews, and approved strings export back to the repo.
- [Interviews](https://interviewsfs.com): Technical interview practice from your companies and stack. You approve the quiz plan, then sit a few rounds a week.
- [Pigeon](https://pigeonfs.com): Transactional email on your own Amazon SES account. Verify a domain, send through the API, and keep a log of every message.

## Games

We develop engaging and addictive mobile games with intuitive mechanics and polished gameplay. Our games range from reimagined classics to innovative new concepts, all designed with a focus on user experience and enjoyment.

- [Ink Blast](https://play.google.com/store/apps/details?id=com.balconygames.gun): A vertical ink shooter. Hold to fire, release for slow motion, and shatter numbered crystal asteroids before they reach the ship.
- [Ink Surge](https://play.google.com/store/apps/details?id=com.balconygames.inksurge): A survival run on living parchment. Attacks fire on their own while you dodge the blots, unlock beasts, and leave a longer stain.
- [Magekeep Siege](https://play.google.com/store/apps/details?id=com.balconygames.towermage): A 3D idle citadel. The keep fights incoming waves while you grow a hex island, cast spells, and raid rival keeps.
- [Crystal Blast | Cannon](https://play.google.com/store/apps/details?id=com.balconygames.CrystalBlast): An exhilarating space-themed action game where players blast crystal invaders with their starship's advanced technology
- [Don't Fall](https://play.google.com/store/apps/details?id=com.balconygames.dontfall): A challenging hyper-casual endless runner where players must navigate a path while preventing their ball from falling
- [Bricks Breaker | Bricks](https://play.google.com/store/apps/details?id=com.balconygames.BricksBreaker): A modern take on the classic brick-breaking game featuring over 4000 levels and 300+ unique power-ups
- [Snake](https://play.google.com/store/apps/details?id=com.balconygames.snake): A creative blend of the classic snake game and runner mechanics with colorful gameplay and multiple levels

## Chrome Extensions

We develop useful Chrome extensions that enhance browser functionality and help users learn new languages. Our extensions focus on providing value through clean interfaces and practical features for everyday browsing.

- [Learn Basque](https://chromewebstore.google.com/detail/learn-basque/goplofbdpdkeopimioaecokgpfcaooom): Chrome extension that displays Basque words with English translations on new tabs, helping users learn vocabulary daily
- [Learn Spanish](https://chromewebstore.google.com/detail/learn-spanish/onnolcnjhjbmcgfppkmamfkadklopbkj): Chrome extension providing 10 new Spanish-to-English word translations daily with a clean, distraction-free interface
- [Learn French](https://chromewebstore.google.com/detail/learn-french/jajgjaibgcfdidjidojidenpfcfjeaoj): Language learning extension that displays French vocabulary with English translations on every new tab

## MCP Servers

Model Context Protocol (MCP) servers extend AI agents with specialized capabilities and tools. Our MCP servers enable AI assistants to interact with external services and perform complex tasks, making AI agents more powerful and versatile.

- [mcp-ffmpeg](https://github.com/bitscorp-mcp/mcp-ffmpeg): Model Context Protocol server providing FFmpeg functionality for AI assistants
- [mcp-adjust](https://github.com/bitscorp-mcp/mcp-adjust): Model Context Protocol server for Adjust.com analytics access and mobile app performance summaries

## Open Source Projects

We believe in the power of open-source software and actively contribute to the developer community. Our open-source projects are used by thousands of developers worldwide and have received positive feedback for their quality and utility.

- [devise_masquerade](https://github.com/oivoodoo/devise_masquerade/): Ruby gem that simplifies user impersonation for applications using Devise
- [exfacebook](https://github.com/oivoodoo/exfacebook/): Elixir wrapper for the Facebook Graph API
- [phoenix_lens](https://github.com/oivoodoo/phoenix_lens): Mountable SQL notebook for Phoenix. Save questions, pin dashboards, and mask PII in every result, with an MCP endpoint for agents.
- [pghero-elixir](https://github.com/oivoodoo/pghero-elixir): Postgres performance dashboard for Phoenix, an Elixir port of PgHero. Slow queries, space, connections, and explain, mounted in the app or run as Docker.
- [phoenix_healthy](https://github.com/oivoodoo/phoenix_healthy): Kubernetes liveness and readiness probes for Phoenix. /health/live and /health/ready, with a database check when an Ecto repo is configured.
- [oivoodoo](https://github.com/oivoodoo): Primary Github account with various open-source contributions

## Contact

Book a 30-min call: https://cal.com/alexandr-korsak-maasgv/30min
Email: alex@bitscorp.co
Website: https://bitscorp.co
Portfolio: https://bitscorp.co/portfolio
Team: https://bitscorp.co/team
Careers: https://bitscorp.co/careers
All services: https://bitscorp.co/services

## Areas Served

Europe (primary), remote worldwide
Based in Barcelona, Spain
Timezone: CET/CEST (UTC+1/+2)

---

Full content: https://bitscorp.co/llms-full.txt
Sitemap: https://bitscorp.co/sitemap.xml