ConnectPay has launched Serdis, an AWS-native core banking platform now available to European EMIs and financial institutions.
Serdis started as an internal project named “Mars”– built to eliminate our dependency on third-party core systems. In July 2025, it took over ConnectPay’s entire live operations: €14 billion in annual transaction volume, moved in a single weekend, with zero customer-visible downtime.
Now we’re making it available to the market.
Built by an operator, not a vendor
Most core banking systems are built by software providers who’ve never managed a safeguarding account or answered to a central bank. Serdis was built by a regulated EMI and tested under real operating conditions – which means compliance updates we build for ourselves get passed straight on to Serdis clients.
“Most core banking platforms are engineered by developers who have never had to manage a safeguarding account, file a regulatory report, or answer to a central bank,” said Marius Galdikas, Founder & CEO of ConnectPay. “Serdis was built to run, not sell.”
Serdis runs on a distributed microservices architecture on AWS EKS, with a tree-based General Ledger, real-time balances, automated IBAN lifecycle management, and FX and treasury engines. It supports native SEPA, SEPA Instant, and SWIFT MT/MX, with pre-integrated white-label web and mobile banking front-ends.
Proven through our own migration
The team ran Serdis in parallel with ConnectPay’s legacy provider for nine months before cutover, resolving reconciliation risks upfront rather than during deployment.
“Core banking is the single source of truth for every balance and transaction,” said Tadas Bakutis, CTO of ConnectPay and technical architect of the migration. “By designing, building, and migrating to this core ourselves, we proved a financial institution can reclaim its technical freedom without disrupting its users.”
Building toward a more independent industry
Around 70% of Tier 1 banks are still running on legacy core systems – a gap drawing closer regulatory attention as scrutiny of third-party infrastructure risk tightens under DORA.
“We want a European fintech ecosystem built on resilient infrastructure institutions actually own, rather than dependencies they rent,” said Galdikas, who also chairs the Lithuanian Fintech Association.
Serdis is now available to European EMIs and financial institutions looking to migrate safely and take ownership of their infrastructure. Learn more at www.serdis.io
FAQ: Serdis core banking
What is Serdis?
Serdis is an AWS-native core banking platform that gives financial institutions ownership of their data, uptime, and product roadmap. It was originally built inside ConnectPay, a licensed EMI, and is now available as an independent product.
What does “Serdis” mean?
The name comes from the Lithuanian word šerdis, meaning “core” – the essential part of a system.
Who is Serdis for?
European EMIs and financial institutions looking to move away from legacy core banking systems and gain full control over their infrastructure.
How does Serdis handle migration risk?
Serdis is built to inherit and map a legacy system’s data model, so reconciliation risks are resolved before cutover rather than during it. ConnectPay’s own migration moved €14 billion in annual turnover in a single weekend with zero customer-visible downtime.
What payment rails does Serdis support?
Serdis natively supports SEPA, SEPA Instant, and SWIFT MT/MX, with pre-integrated white-label web and mobile banking front-ends.
Is Serdis deployed in the client’s own environment?
Yes. Serdis is deployed within the client’s own AWS environment and includes a contractual source-code buyout option.
Where can I learn more about Serdis?
Visit serdis.io per maggiori informazioni.
