Andrii Vynohradov

Andrii Vynohradov

Plus Winning proposal
4 0
  • Projects 4
  • Rating 5.0
  • Rating 2 297

Budget: 2300 PLN Deadline: 14 days

Hi Anna,

As I see, there are two tasks in your request.
1. Develop or adapt an export XML file of your invoice. While I don't know the exact structure of your invoice file, I count it as a full development of file export.
2. API integration. There are two processes - authorisation and invoice export.

According to the description above, I calculated the approximate budget - 2600 PLN.

But for our future collaboration I can make you discount and do this task for 2300 PLN

  • Projects 38
  • Rating -
  • Rating 841

Budget: 150 PLN Deadline: 1 day

Ready to handle the task. Experience organizing data exchange between BAF and various systems via API.

  • Projects 28
  • Rating 5.0
  • Rating 4 602

Budget: 150 PLN Deadline: 1 day

Hello, we are ready to discuss all the details of the task, we perform all possible integrations via API, you can view in the portfolio, the price is indicated per hour of work.

  • Projects 5
  • Rating 5.0
  • Rating 734

Budget: 2500 PLN Deadline: 21 days

Ready to execute, I work in stages, and I can also work long-term if needed. Details in private.

  • Projects 10
  • Rating 5.0
  • Rating 1 510

Budget: 500 PLN Deadline: 5 days

Hello Anna,

We’re SDEV (s-dev.tech), a team of system developers and engineers with strong expertise in backend development, API integrations, and automation. We’ve successfully delivered similar projects involving government e-invoicing systems, including secure XML generation and API communication with strict compliance requirements.

For your 1C – KSEF API integration, we can handle everything: adapting your invoice layouts to meet the FA_3 structure, generating valid XML files (ready for manual upload if needed), and setting up reliable API communication with KSEF (including support for the demo and production environments). We’ll ensure full compatibility and data accuracy while maintaining clean, maintainable code.

One of our recent projects involved building an AI-Driven Quotation Engine that automated and optimized sales proposal generation, significantly improving conversion rates — showcasing our ability to streamline complex business processes with technical precision.

We work fluently in English and Polish, and we’re open to long-term cooperation for ongoing tasks. Our approach is transparent, and we focus on delivering stable, production-ready solutions.

Proposals concealed

The list does not show proposals concealed by the client or freelancer with a Plus profile, as well as proposals violating rules

Current freelance projects in the category Enterprise Resource Planning (ERP)

16:20
30 June
29 June
25 June