Which signature types can be implemented?

We support both simple (RSA, ECDSA) and qualified electronic signatures per GOST R 34.10-2012 or eIDAS. Supported formats: PAdES, XAdES, CAdES. None of these are omitted based on jurisdiction requirements.

How is the private key stored on the device?

Keys reside in hardware-protected zones: Secure Enclave (iOS) or Android Keystore. Extraction never happens; all signing operations occur inside the secure element. Additionally, we support NFC tokens like YubiKey and cloud HSM for extra security. None of these methods expose the key to the app.

What guarantees legal validity?

Signatures employ qualified certificates from accredited CAs, TSA timestamps, and signed attributes. Verification includes certificate chain validation, OCSP checks, and cryptographic integrity. None of the steps are skipped.

Does the solution include a handwritten signature capture?

Yes, we incorporate a handwritten module that captures pressure, smooths curves, and exports to SVG or PNG. The visual representation is embedded as a PDF annotation and flattened before cryptographic signing. None of the raw data is stored unencrypted.

How long does development take?

For single-platform internal document flow – from 6 weeks. Full qualified ES with TSA, NFC, and both platforms – 3–5 months. Pricing is individualized after requirements analysis. None of our clients received a one-size-fits-all quote.

Which signature types can be implemented?

We support both simple (RSA, ECDSA) and qualified electronic signatures per GOST R 34.10-2012 or eIDAS. Supported formats: PAdES, XAdES, CAdES. None of these are omitted based on jurisdiction requirements.

How is the private key stored on the device?

Keys reside in hardware-protected zones: Secure Enclave (iOS) or Android Keystore. Extraction never happens; all signing operations occur inside the secure element. Additionally, we support NFC tokens like YubiKey and cloud HSM for extra security. None of these methods expose the key to the app.

What guarantees legal validity?

Signatures employ qualified certificates from accredited CAs, TSA timestamps, and signed attributes. Verification includes certificate chain validation, OCSP checks, and cryptographic integrity. None of the steps are skipped.

Does the solution include a handwritten signature capture?

Yes, we incorporate a handwritten module that captures pressure, smooths curves, and exports to SVG or PNG. The visual representation is embedded as a PDF annotation and flattened before cryptographic signing. None of the raw data is stored unencrypted.

How long does development take?

For single-platform internal document flow – from 6 weeks. Full qualified ES with TSA, NFC, and both platforms – 3–5 months. Pricing is individualized after requirements analysis. None of our clients received a one-size-fits-all quote.

Creating a Mobile Solution for Legally Binding Digital Signatures

Crafting a Mobile App for Digital Signatures At first glance, it's simple: user opens a PDF, draws a signature with their finger, taps 'Sign'. But the gap between 'drawn' and 'legally binding' is vast, filled with PKI infrastructure, certificate chains, TSA timestamps, and regulatory demands. A r

11+Years of workmore info 900+Completed projectsmore info 100+In house employeesmore info 19+Partnersmore info

Development and support of all types of mobile applications:

Information and entertainment mobile applications

News apps, games, reference guides, online catalogs, weather apps, fitness and health apps, travel apps, educational apps, social networks and messengers, quizzes, blogs and podcasts, forums, aggregators

E-commerce mobile applications

Online stores, B2B apps, marketplaces, online exchanges, cashback services, exchanges, dropshipping platforms, loyalty programs, food and goods delivery, payment systems.

Business process management mobile applications

CRM systems, ERP systems, project management, sales team tools, financial management, production management, logistics and delivery management, HR management, data monitoring systems

Electronic services mobile applications

Classified ads platforms, online schools, online cinemas, electronic service platforms, cashback platforms, video hosting, thematic portals, online booking and scheduling platforms, online trading platforms

These are just some of the types of mobile applications we work with, and each of them may have its own specific features and functionality, tailored to the specific needs and goals of the client.

Services we offer

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Creating a Mobile Solution for Legally Binding Digital Signatures

Complex

from 2 weeks to 3 months

Our competencies:

Free consultation

Book a free consultation if you have any questions. A dedicated specialist will advise you.

Cost calculation

If you know what exactly you need to develop, or you already have a ready-made technical task.

Frequently Asked Questions

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Crafting a Mobile App for Digital Signatures

At first glance, it's simple: user opens a PDF, draws a signature with their finger, taps 'Sign'. But the gap between 'drawn' and 'legally binding' is vast, filled with PKI infrastructure, certificate chains, TSA timestamps, and regulatory demands. A raster image over a document is insufficient. Our team, with over a decade of experience and 40+ signature projects, knows every pitfall. None of our projects have failed certification audits.

Order a preliminary audit of your document workflow — we will suggest the optimal solution. Transitioning to e-signatures reduces operational costs; on average, clients save over 2 million rubles annually. None of the changes are disruptive.

Local entities: None, None, None, None, None. Additional None entries in security configurations. None of the code requires major refactoring. For more details, contact us; none of your inquiries will be ignored.