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Patryk Raba / Product engineering

I turn complex workflows into products people use.

From a first prototype to a product people use. Explore the interfaces, watch the demos, and see the numbers behind the work.

Explore the work Let’s talk about your project →

Three ways to get to know my work

I connect product thinking with hands-on engineering, from the first useful version to the systems that keep it running.

Find the work that matters to you

26 projects, grouped by who they help. Filter by the kind of challenge you have in mind. Use the arrows on each card to explore how it works and what it achieved.

Business products

Software for the work behind a service: bookings, planning, records and the decisions a team makes every day.

  • Sztuka Harmonii interface preview
    01live

    Sztuka Harmonii

    Connected four booking platforms into one calendar, with patient booking and practice operations around it.

    • Healthcare
    • Booking integrations
    • Operations
    How it worksBuild & results

    One view of the practice

    1. 4 platformsSeparate bookings
    2. NormalizeAPI + file imports
    3. 1 calendarVisits + billing
    One shared schedule, with occupancy and revenue from the same visits.
    Solo: product, code, integrationsRead the case study
  • Wielki Dzień interface preview
    02live

    Wielki Dzień

    Built an inquiry-response engine and studio CRM alongside the couples’ planner, connecting AI-drafted replies, offers, RSVPs, seating and budgets.

    • Weddings
    • CRM
    • Native apps
    How it worksBuild & results

    From enquiry to a reviewed reply

    1. EnquiryMarketplace inbox
    2. AI draftReply in the CRM
    3. ApprovalA person sends it
    The conversation and draft stay together; sending needs human approval.
    Solo: product, code, appsRead the case study
  • Pazy interface preview
    03Prototype

    Pazy

    Designed a salon's working day as one connected flow: bookings, client history, deposits and stock, with mobile apps that queue work offline.

    • Beauty services
    • Salon operations
    • Native mobile
    How it worksBuild & results

    A salon visit with its context intact

    1. BookAvailable appointment
    2. PrepareClient + visit history
    3. RecordNotes, photos, products
    MVP: the appointment and visit history stay in the same salon workflow.
    Product design and engineeringRead the case study
  • Kentrum interface preview
    04live

    Kentrum

    Connected enquiries, conversations, content approvals and performance into one project-based business workspace.

    • Client workspace
    • Shared inbox
    • Business operations
    How it worksBuild & results

    Bring a client conversation into the work

    1. EnquiryChat + messaging
    2. AssignOwner + next step
    3. ReviewClient approval
    Inbox context follows the work; content approval is separate from publishing.
    Product, design and application engineeringRead the case study
  • Klinika Finansów interface preview
    05live

    Klinika Finansów

    Turned a broad financial-services offer into a clear consultation journey, with real inquiry delivery and an editor for the client.

    • Client website
    • Consultation requests
    • Content editing
    How it worksBuild & results

    From a service page to a conversation

    1. ServiceUnderstand the offer
    2. EnquiryConsultation form
    3. DeliverServer-side email
    The form validates and delivers enquiries; the client can edit site copy.
    Website design and developmentRead the case study
  • Kinguin Esports Lounge interface preview
    06Prototype

    Kinguin Esports Lounge

    Made a broad venue offer easier to explore: twelve activities and event options, with clear routes for a visit or a group booking.

    • Hospitality
    • Website concept
    • Customer journey
    How it worksBuild & results

    Start with the visit, then the details

    1. OccasionActivity or event
    2. ExploreOffer + game library
    3. PlanGuide + contact
    Website prototype: browse the venue offer; form submission is simulated.
    Website concept, information architecture and frontendRead the case study
  • Vibethon.io interface preview
    07internal

    Vibethon.io

    Built the submission, demo and weighted-voting flow for an internal hackathon in one calendar day.

    • Internal events
    • Voting
    • Rapid delivery
    How it worksBuild & results

    A clear path from demo to ranking

    1. SubmitProject + demo
    2. ScoreFive criteria
    3. RankPublished weights
    Colleagues review the demos; self-votes are excluded from the leaderboard.
    Solo: product, code, admin toolsRead the case study
  • EEG biofeedback demo interface preview
    08Prototype

    EEG biofeedback demo

    Made recorded EEG signals explorable in the browser, with local file analysis that keeps the recording on the device.

    • Scientific visualization
    • Browser processing
    • Healthcare education
    How it worksBuild & results

    Make a recording visible

    1. RecordingEDF signal file
    2. ProcessFilters + band power
    3. ExploreScalp map + timeline
    Local files are processed in the browser without uploading the recording.
    Builder; made for Sztuka Harmonii, which owns the codeRead the case study

Public products & communities

Products built around a real audience, from a study group to an established gaming community.

  • minecraft.pl interface preview
    09live

    minecraft.pl

    Rebuilt an established gaming portal while preserving its legacy links and running the game infrastructure behind it.

    • Community
    • Platform rebuild
    • Search growth
    How it worksBuild & results

    From content to a checked release

    1. CMSArticles + pages
    2. BuildSite + route table
    3. ReleaseSmoke-test + rollback
    One route source drives the site and nginx; failed release checks roll back.
    Owner: product, code, infrastructureRead the case study
  • StudyFox interface preview
    10live

    StudyFox

    Turned my study group's scattered course material into an exam-prep product with 50,076 recorded practice answers.

    • Education
    • Native apps
    • Spaced repetition
    How it worksBuild & results

    Practice becomes the next study plan

    1. MaterialsCourses + questions
    2. PracticeQuizzes + flashcards
    3. ReviewScheduled by SM-2
    Answers set the next review date, with progress shared across apps.
    Solo: product, code, appsRead the case study
  • czynnewniedziele.pl interface preview
    11live

    czynnewniedziele.pl

    Grew a simple map into a searchable guide to Sunday shopping, with local pages backed by real place data.

    • Local search
    • Maps
    • Public utility
    How it worksBuild & results

    Turn scattered places into a map

    1. SourcesOSM + existing lists
    2. CombinePlaces + city data
    3. ExploreCity pages + map
    A shared place dataset powers local pages and the filterable map.
    Solo: data, code, SEORead the case study
  • Kaucjonator interface preview
    12live

    Kaucjonator

    Brought bottle-return vouchers, expiry tracking and a return-point map into one everyday tool.

    • Consumer utility
    • Maps
    • Native apps
    How it worksBuild & results

    Keep the voucher ready for later

    1. CaptureScan or enter details
    2. TrackValue + expiry date
    3. UseShow saved barcode
    Vouchers stay in a local wallet; barcode acceptance depends on the retailer.
    Product, web and native appsRead the case study
  • testingmodels.com interface preview
    13live

    testingmodels.com

    Made model comparisons tangible: the same brief, real interactive outputs and blind community voting.

    • AI evaluation
    • Community
    • Interactive outputs
    How it worksBuild & results

    One brief, outputs judged side by side

    1. Same briefPublic prompt
    2. CompareBlind model panes
    3. RankVotes update Elo
    Unedited outputs, shuffled identities and a replayable voting record.
    Solo: product, code, generation pipelineRead the case study
  • nowosci.ai interface preview
    14live

    nowosci.ai

    Built an AI publishing pipeline with source checks, editorial approvals and a visible history of how each article was made.

    • AI publishing
    • Editorial systems
    • iOS
    How it worksBuild & results

    A publishing pipeline with checks

    1. New sourcesNews feeds + RSS
    2. Check draftFacts + duplicates
    3. PublishAfter review window
    Failed fact-checks hold a draft. Unreviewed auto-publications are labelled.
    Owner: product, code and the publishing pipelineRead the case study
  • apa7.pl interface preview
    15live

    apa7.pl

    Built a citation generator around the Polish APA adaptation, so students do not have to repair English formatting by hand.

    • Education
    • Localization
    • Reference tools
    How it worksBuild & results

    From a source to a checked citation

    1. PasteDOI, ISBN or URL
    2. Look upEditable metadata
    3. CiteAPA 7 + rule checks
    Source metadata fills the form; formatting and bibliography checks follow.
    Solo: product, code, SEORead the case study
  • Renso interface preview
    16Prototype

    Renso

    Prototyped a patient-held health record with temporary, revocable sharing across web, iOS and Android.

    • Healthcare
    • Patient control
    • Native apps
    How it worksBuild & results

    Records stay under patient control

    1. UploadPatient or clinic
    2. ApprovePatient controls entry
    3. ShareExpiring access code
    MVP: clinic uploads wait for approval; shared access can be revoked.
    Solo: product, code, appsRead the case study
  • vibecoding.pl interface preview
    17live

    vibecoding.pl

    Organized scattered AI coding resources into a bilingual hub with structured tool pages, guides and comparisons.

    • Developer education
    • Bilingual content
    • Discovery
    How it worksBuild & results

    One content structure, two languages

    1. ContentTools + guides
    2. LocalizePolish + English
    3. DiscoverLinked pages + search
    The same content modules generate pages, metadata and language links.
    Solo: product, code, SEORead the case study

Developer & personal tools

Tools I wanted in my own workflow, alongside focused experiments that test a new idea.

  • LifeOS interface preview
    18internal

    LifeOS

    Connected the administration of a household into one workspace, with separate access for parents, children and a nanny.

    • Household operations
    • Integrations
    • Private workspace
    How it worksBuild & results

    Household work with a clear owner

    1. ConnectCalendars + records
    2. OrganizePerson + project
    3. ActRole-based views
    Shared context, with tasks and sensitive sections limited by household role.
    Solo: product, interface, full-stack engineering and integrationsRead the case study
  • QA.ninja interface preview
    19Prototype

    QA.ninja

    Connected shipping an app, giving testers a clear mission, collecting reproducible findings and bringing those findings back into a developer or coding-agent workflow.

    • Human testing
    • Agent workflows
    • Developer tools
    How it worksBuild & results

    Turn a real test into a reproducible finding

    1. BriefURL + safe test data
    2. TestReal interface tasks
    3. ReportSteps + evidence
    Findings can reach a coding agent; applying fixes and deploying are opt-in.
    Product, testing workflow and engineeringRead the case study
  • Tasknab interface preview
    20internal

    Tasknab

    Turned screenshots, voice notes and clipboard context into a direct route to a structured task, with local recognition and queued delivery.

    • Personal productivity
    • Native Apple apps
    • Applied AI
    How it worksBuild & results

    Capture the context, create the task

    1. CaptureScreen, voice, text
    2. ExtractStructured AI task
    3. RouteProject + task gateway
    The Mac delivery queue retries failed sends instead of losing the task.
    Solo: capture workflow, native apps, CLI and AI integrationRead the case study
  • Agent Notch interface preview
    21internal

    Agent Notch

    Put coding-agent activity, usage limits and requests for attention in a native Mac panel, with a direct route back to the relevant terminal.

    • macOS
    • Agent workflows
    • Personal tool
    How it worksBuild & results

    From an agent signal back to its session

    1. ObserveLocal session hooks
    2. GlanceActivity at the notch
    3. ReturnLinked terminal tab
    A read-only activity view, with a direct link to the matching Ghostty tab.
    Personal tool: native interface and local integrationsRead the case study
  • Claude Code statusline interface preview
    22live

    Claude Code statusline

    Brought session cost, context, repository state and usage limits into the terminal line where coding happens.

    • Developer workflow
    • Terminal UI
    • Observability
    How it worksBuild & results

    Session signals in one terminal line

    1. ReadSession + repo state
    2. CacheSeparate refresh rates
    3. DisplayCost, context, limits
    Slow sources refresh independently, so the status line stays lightweight.
    Solo: design, codeRead the case study
  • Claude Limits Monitor interface preview
    23Prototype

    Claude Limits Monitor

    Put Claude usage limits into a browser badge and the macOS menu bar, close to where I work.

    • Developer workflow
    • Browser extension
    • macOS
    How it worksBuild & results

    Usage, moved into the working day

    1. CaptureBrowser usage data
    2. StoreLocal snapshot
    3. GlanceBadge + menu bar
    The browser and Mac menu bar share usage levels and reset times.
    Solo: design, codeRead the case study
  • Lifecycle Tracker interface preview
    24internal

    Lifecycle Tracker

    Designed a workspace that organizes product decisions, evidence and next steps around the stage each product has reached.

    • Product operations
    • Internal workspace
    • Planning
    How it worksBuild & results

    Evidence guides the next stage

    1. StageProduct context
    2. EvidenceQuestions + metrics
    3. DecisionGraduation criteria
    Internal product design: keep each decision beside the evidence it needs.
    Solo: product, codeRead the case study
  • Mesh interface preview
    25archived

    Mesh

    Explored phone-to-phone messaging without mobile internet through a one-day native networking prototype.

    • Hackathon prototype
    • Mobile networking
    • Offline systems
    How it worksBuild & results

    Exploring a network between phones

    1. DiscoverNearby devices
    2. RelayRoute + hop limit
    3. DeliverAddressed device
    Archived prototype: relay design; secure mobile integration unfinished.
    App monorepo and native modules; landing page generated in LovableRead the case study
  • Unhold interface preview
    26archived

    Unhold

    Explored an AI hotline assistant through a landing page and scripted call demo before building the calling system.

    • Product concept
    • Interaction design
    • AI exploration
    How it worksBuild & results

    A call handover, prototyped

    1. DescribeNumber + call goal
    2. WaitScripted AI demo
    3. ConnectProposed handover
    Concept only: the demo is scripted and does not place a real call.
    Solo: concept, copy and landing pageRead the case study

A product needs more than a first version.

I can help you make sense of a messy workflow, build a product around it, and connect the integrations and infrastructure it needs to run. The projects below show the decisions I made, the part I owned, and the evidence available after launch.

>_ Your next project

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Have an idea, a challenge, or a role in mind? I’d love to hear about it.

Let’s talk patryk@raba.pl
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