Electronic Signature System — eIDAS, QES and Mobile Signing in One Flow
A custom electronic signature system covering the full eIDAS spectrum — simple (SES), advanced (AES) and qualified electronic signature (QES) through certified providers. One legally valid esignature workflow for contracts, quotes and HR documents across the EU.
What the electronic signature system includes
A complete esignature workflow with all three eIDAS levels, QES integration, multi-signer ordering, reusable templates and a tamper-evident audit trail — defensible in court and across EU regulators.
Simple e-signature (SES)
Drawn signature with mouse, touch or stylus in the browser. Valid for most B2B deals, NDAs and internal approvals. Each signature is sealed with timestamp, IP and document hash.
Advanced e-signature (AES)
Certificate-based signature with strong identification via email OTP, SMS code or video verification. Covers regulated contracts and HR addenda without a physical token.
Qualified electronic signature (QES)
Direct integration with EU-trusted providers — Stampit, Borica B-Trust, Evrotrust — through PKCS#11 or cloud API. Legal equivalent to a handwritten signature across the EU.
Multi-signer order
Sequential, parallel and conditional signing — client, lawyer, manager — with automated reminders, decline with comment and rollback when a signature is missing past deadline.
Templates and dynamic fields
Word and PDF templates with merge fields, signature blocks, initials and date. One employment template covers unlimited hires — no copy-paste, no missing clauses.
Audit trail and integrations
Tamper-evident audit log plus webhooks to DMS, CRM and contract management software. Mobile signing on iOS and Android with biometrics — signed contract straight from the phone.
Who this electronic signature system is for
Three profiles where the print-sign-scan loop directly eats revenue, time and compliance buffer.
B2B with digital contracts
SaaS, services, subscription and distribution companies signing 50+ contracts per month. Sales cycle drops from days to hours, and the signed PDF lands in the CRM without manual upload.
HR for employment contracts
Companies with remote and distributed teams handling employment contracts, addenda, job descriptions and orders. Employer QES plus employee AES — full eIDAS compliance, zero courier cost.
Legal and accounting firms
Lawyers, notaries, accountants and auditors processing powers of attorney, service contracts and statutory filings. QES plus long-term validation (LTV) keeps documents valid past certificate expiry.
How we build the electronic signature system
Owned code, eIDAS-compliant architecture and signatures in formats that survive court and tax-audit scrutiny.
Cryptographic stack
PAdES, XAdES, CAdES: embedded signatures for PDF, XML and CMS containers, with long-term validation profile.
PKCS#11 QES layer: direct talk to cryptographic tokens and smart cards from EU trust providers — no third-party middleware.
eIDAS timestamping: qualified timestamp from an accredited TSA on every signed version — independent of server clock.
Hash-chain audit log: every action recorded with SHA-256 chain that cannot be rewritten after the fact.
DMS, CRM and contract integrations
DMS push: archive to digital archive software with full metadata for instant search.
Contract sync: bidirectional flow with contract management software — status, versions, renewal alerts.
CRM webhook: signed contract auto-marks the deal won, starts subscription and triggers onboarding sequence.
Mobile signing API: native iOS and Android with FaceID or TouchID — for field teams and store staff.
Why Saitami for an electronic signature system
Three measurable outcomes from real eIDAS deployments — not marketing claims.
Send-to-signed contract time
From an average 4.6 working days to under one — multi-signer reminders, mobile signing and pre-filled fields remove the waiting between parties.
EU-compliant signatures
PAdES-LTV, qualified timestamping and QES through EU trust providers — defensible in court and across regulators in every member state.
Starting investment
Fixed-price MVP — SES and AES, multi-signer, templates, audit trail and one DMS integration. Production-ready in three weeks, no per-signature fees.
Frequently Asked Questions
What is the difference between simple, advanced and qualified electronic signature?
eIDAS defines three levels. Simple (SES) is drawn or click-to-sign — valid for most B2B contracts. Advanced (AES) adds strong identification and a certificate uniquely tied to the signer. Qualified (QES) is the legal equivalent of a handwritten signature across the EU and is required for public procurement, notarial acts and statutory filings in regulated sectors.
What do I need for QES integration?
For local QES — a token or smart card from an EU trust provider plus a PKCS#11 driver on the signer's machine. For cloud QES — an account with the provider and our integration with their API, which works without a device using two-factor authentication. Both flows produce a PAdES signature with qualified timestamp, valid across the EU.
What happens in a dispute?
The signed PDF carries an embedded signature, the signer's certificate, qualified timestamp and a hash chain to the audit log. In a dispute we extract an evidence package — who, when, from which IP, with which certificate and on which version. PAdES-LTV ensures the signature stays verifiable even after certificate or TSA expiry.
How much does an electronic signature system cost?
Starting investment is from €1,800 one-off — SES and AES, multi-signer flow, templates, audit trail and one DMS or CRM integration. Production-ready in three weeks. A full eIDAS platform with QES through EU trust providers, PAdES-LTV, mobile signing and zero per-signature fees runs €4,500–€9,000. Owned code, no vendor lock-in, no document cap.
Ready to remove the courier from your contract flow?
A free 30-minute call — we review your current signing flow, check eIDAS compliance and propose a concrete scope at a fixed price. An electronic signature system pays back in under six months at 50+ contracts a month. Related pages: digital archive software, contract management software, software development and API integrations.
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