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Software & sales systems & B2B dashboards

JSON Crew is a software house specialized in one thing: digital sales transformation for manufacturing and product companies. We build the systems that shorten the path from a customer's first interest to a signed contract.

We don't sell isolated features — we build one connected system, layer by layer, wherever a company loses customers:

  • Min project size
    $10,000+
  • Hourly rate
    $50 - $99 / hr
  • Employees
    2 - 9
  • Locations
    Kraków, Poland
  • Year founded
    Founded 2025

Overview by:

Reviewer avatar
Bartłomiej Kołodziejczyk

1 Locations

  • Kraków , Poland

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    Pricing Snapshot

    Min. project size $10,000+
    Avg. hourly rate $50 - $99 /hr
    Rating for cost 5 /5

    Most Common Project Size

    < $10,000 based on 1 review
    < $10,000 $10,000 - $49,999 $50,000 - $199,999 > $200,000

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    Highly Rated Similar Providers

    Overall Review Rating

    4.5
    • Quality

      5.0 /5
    • Schedule

      5.0 /5
    • Cost

      5.0 /5
    • Willing to Refer

      5.0 /5
    See all 1 Reviews

    JSON Crew Reviews

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    Custom Software Development for Electronic Device Company

    • Custom Software Development
    • Less than $10,000
    • Apr. - July 2025
    4.5
    Quality
    5.0
    Schedule
    5.0
    Cost
    5.0
    Willing to Refer
    5.0

    "They did good work."

    Jul 21, 2025
    Director, KG Elektronik
    Gregor Koman
    Verified
    • Electric
    • Mielec, Poland
    • 11-50 Employees
    • Online Review
    • Verified

    JSON Crew provided custom software development services for an electronics device company. The team developed a smart control app and helped the client launch the app.

    Showing 1-1 of 1 Reviews

    Our Story

    We're JSON Crew!
    Three founders who believe sales is a system problem, not a people problem. A manufacturer can have a great product and still sell it like it's 2005, offers in Word or PDF the client never opens. 

    • Jędrzej (CEO, 10+ yrs B2B Strategy & heavy tech FullStack)
    • Maciej (CMO, 25+ yrs B2B marketing) 
    • Bartłomiej (COO, 10+ yrs full-stack, customer success & sales)

    We start every project with a process map, not a framework. We design and improve whole sales proccess!

    Meet the Team

    Bartłomiej Kołodziejczyk

    Bartłomiej KołodziejczykCOO

    Jędrzej Siewierski

    Jędrzej SiewierskiCEO

    What Sets Us Apart

    We run our own SaaS

    We don't just build software — we run JSON Hub, our own CRM and quoting platform. We understand the product side operationally, not just from a brief.

    AI-first, 8-week MVP Fixed Price

    AI-first delivery (Cursor + Claude). A product configurator MVP in 8 weeks, fixed price, clear scope -> NOT 8 months of open-ended billing.

    Process before framework

    Every project starts with a process map and the profitability of your sales flow. We scope tightly and turn down projects that aren't a fit.

    Locations (1)

    Aleja Generała Tadeusza Bora-Komorowskiego 25/P4 p.24 KrakówPoland 31-476

    6 - 9

    Contact JSON Crew

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