Tallinn has an unusually concentrated fintech engineering market, with providers ranging from custom development teams to specialists in banking infrastructure, payments, trading, lending, and regulatory software. The companies below were selected for demonstrable fintech development capabilities and a relevant Tallinn, Estonia, or broader European delivery presence.
1. Itexus
Itexus builds software for regulated financial products. Its work covers digital banking, lending, payments, wealth management, and trading platforms. It also builds onboarding, KYC and AML workflows, financial data systems, and core banking integrations. Beyond that, the team handles legacy modernization, DevOps, fintech UI/UX, AI implementation, and staff augmentation.
Itexus has no Tallinn office, but it gives Tallinn fintech companies access to an established European delivery team. It fits complex products with many financial integrations, strict security needs, and high transaction loads. Past projects include digital wallets, banking apps, wealth platforms, lending systems, and automated trading software.
Key Facts
- Best for: Regulated and integration-heavy fintech products
- Core services: Fintech software development, mobile apps, consulting, AI, DevOps, staff augmentation
- Fintech areas: Banking, payments, lending, trading, wealthtech, KYC and AML
- Geographic coverage: Europe and international markets
- Notable strength: Fintech-focused engineering across 300+ projects
Contact Information
- Website: itexus.com
- Email: moc.suxeti@ofni
- Address: Twarda 14, 00-824 Warszawa, Poland
- LinkedIn: www.linkedin.com/company/itexus
- Facebook: www.facebook.com/itexus
- Twitter: x.com/ItexusSoft
- Instagram: www.instagram.com/itexus.soft
2. Bamboo Agile
Bamboo Agile is a Tallinn custom software company with its own fintech practice. It builds personal finance and lending apps, digital banking platforms, and enterprise financial systems. The team also offers fintech consulting, backend and mobile development, MVP builds, and support after launch.
For businesses that want an Estonian partner close to the local fintech scene, Bamboo Agile is an easy choice. In financial projects, it focuses on payment integrations, transaction processing, security, fraud features, and EU data protection rules.
Key Facts
- Best for: Fintech startups and BFSI organizations
- Core services: Custom software, fintech consulting, mobile apps, backend development, MVP development
- Fintech areas: Banking, lending, personal finance, payments
- Location: Tallinn, Estonia
- Notable strength: Estonia-based fintech development practice
Contact Information
- Website: bambooagile.eu
- Phone: +372 55 85 000
- Email: ue.eligaoobmab@mn
- Address: Pärnu mnt 21/2-22, 10141, Tallinn, Estonia
- LinkedIn: www.linkedin.com/company/bambooagile
- Facebook: www.facebook.com/BambooAgile
- Twitter: x.com/BambooAgile
3. Codeborne
Codeborne brings deep banking experience to Tallinn. It has built internet banks, rewritten core systems for financial institutions, and built lending systems. It has also helped fintech companies expand into new countries. In one recent project, it delivered a working banking core, SEPA payments, and PSD2 APIs within an eight-month regulatory deadline.
Engineers lead the work. Teams use pair programming and test-driven development, and developers talk to clients directly. That approach pays off when financial software has complex business rules and must stay maintainable long after the first release.
Key Facts
- Best for: Core banking and complex financial platforms
- Core services: Custom software engineering, system modernization, product development
- Fintech areas: Online banking, lending, SEPA payments, PSD2
- Location: Tallinn, Estonia
- Notable strength: Experience building and rebuilding banking systems
Contact Information
- Website: codeborne.com
- Phone: +372 617 7115
- Email: moc.enrobedoc@ofni
- Address: Sepise tn 8, 11415 Tallinn, Estonia
4. ELEKS
ELEKS has a large Tallinn presence and a broad financial software practice. It builds banking platforms, investment and brokerage software, cards and payments, and accounting systems. It also works on risk modelling, fraud detection, data analytics, and customer-facing finance apps.
One engagement can include research and consulting, business analysis, product engineering, data and AI work, and modernization. ELEKS fits complex, enterprise-scale financial transformation better than a small standalone app.
Key Facts
- Best for: Enterprise financial software and modernization
- Core services: Custom development, consulting, data and AI, cybersecurity
- Fintech areas: Banking, payments, investment, risk, fraud detection
- Location: Tallinn, Estonia
- Notable strength: Broad financial engineering capabilities
Contact Information
- Website: eleks.com
- Phone: +372-674-3621
- Email: moc.skele@tcatnoc
- Address: Tallinn, Kursi 3, 10415 Tallinn, Estonia
- LinkedIn: www.linkedin.com/company/eleks
- Facebook: www.facebook.com/ELEKS.Software
- Twitter: x.com/ELEKSSoftware
5. OSKI Solutions
OSKI Solutions has a legal presence in Tallinn and builds custom software, including finance software. It also covers web, mobile, desktop, and backend apps, plus cloud infrastructure, integrations, AI, QA, and dedicated engineering teams. OSKI has published its own guidance on custom fintech development, covering security, financial workflows, integrations, and maintainability.
OSKI fits fintech projects where finance features are part of a larger custom system. That system may need to connect with cloud infrastructure, internal apps, data services, or existing enterprise software.
Key Facts
- Best for: Custom financial applications and supporting business systems
- Core services: Custom software, application development, cloud, AI, QA
- Fintech capability: Finance software development
- Location: Tallinn, Estonia
- Notable strength: Full-cycle senior-led software engineering
Contact Information
- Website: oski.site
- Phone: +48571282759
- Email: etis.ikso@tcatnoc
- Address: Kaupmehe tn 7-120, 10114 Tallinn, Estonia
- LinkedIn: www.linkedin.com/company/oski-solutions
6. Dashbouquet Development
Dashbouquet Development has an office in Tallinn and builds fintech apps. They cover personal and corporate finance, mobile banking, financial risk analysis, investment management, and digital assets. Its mobile service also addresses GDPR and PCI DSS requirements for finance apps.
Consider Dashbouquet when a fintech product is mobile-first but still needs backend services, APIs, payment integrations, and financial business logic. The Estonia office gives buyers a local contact in Tallinn, while the company also works internationally.
Key Facts
- Best for: Mobile-first fintech products
- Core services: Mobile development, web development, custom software
- Fintech areas: Banking, financial management, risk, investments, digital assets
- Location: Tallinn, Estonia
- Notable strength: Fintech-focused mobile application development
Contact Information
- Website: dashbouquet.com
- Phone: +16469348662
- Email: moc.teuquobhsad@tcatnoc
- Address: Narva mnt 7, 10154 Tallinn, Estonia
- LinkedIn: www.linkedin.com/company/dash-bouquet
- Facebook: www.facebook.com/dashbouquet
- Twitter: x.com/dashbouquet
- Instagram: www.instagram.com/dashbouquet
7. Jelvix
Jelvix has its global headquarters in Tallinn and builds software for banking and financial services. Its fintech work covers digital banking, payment systems, lending platforms, and security and risk management. It also works with blockchain, AI, and data-heavy financial apps.
Jelvix can build a whole product or provide a dedicated team. That suits both new fintech products and established firms that need more engineers. Its published projects also include investment and wealth management software with data processing and reporting.
Key Facts
- Best for: Banking, lending, and investment software
- Core services: Product engineering, dedicated teams, AI and data development
- Fintech areas: Banking, payments, lending, wealth management
- Location: Tallinn, Estonia
- Notable strength: Tallinn headquarters with dedicated financial services capabilities
Contact Information
- Website: jelvix.com
- Phone: +12405075471
- Email: moc.xivlej@olleh
- Address: Kaupmehe tn 7, 10114 Tallinn, Estonia
- LinkedIn: www.linkedin.com/company/jelvix
- Facebook: www.facebook.com/JelvixCompany
- Twitter: x.com/jelvix
- Instagram: www.instagram.com/jelvix
8. Umber
Umber is a Tallinn-headquartered engineering company that builds high-load financial systems. It works on trading and payment infrastructure, crypto platforms, CRM systems, internal tools, and related web apps. Its security practices include least-privilege access, MFA, access logs, backups, and disaster recovery testing. Security review is part of development.
Umber suits fintech businesses where reliability and architecture directly affect transaction processing or day-to-day operations. Clients can hire a dedicated team or agree on a fixed project.
Key Facts
- Best for: High-load and operationally critical fintech systems
- Core services: Software architecture, engineering, dedicated teams
- Fintech areas: Payments, trading, crypto
- Location: Tallinn, Estonia
- Notable strength: Reliability and security-focused financial engineering
Contact Information
- Website: umber.tech
- Address: Umber OÜ · Soo tn 7, 10414 Tallinn, Estonia
9. Union FinTech
Union FinTech is based in Tallinn and builds technology only for financial businesses. Its clients include banks, credit unions, lenders, payment providers, fintech companies, and insurers. Its platform covers customer records, payments, accounting, reporting, messaging, and deal management.
Alongside its digital core, the company offers strategy, UX, service design, custom engineering, testing, MVP development, and full product delivery. That suits companies that want ready-made financial modules plus custom work, instead of building a whole platform from scratch.
Key Facts
- Best for: Digital banking cores and financial service platforms
- Core services: Fintech platform development, custom engineering, UX, MVP delivery
- Fintech areas: Banking, payments, lending, insurance, FX
- Location: Tallinn, Estonia
- Notable strength: Financial technology is the primary business focus
Contact Information
- Website: www.unionfintech.com
- Phone: +372 505 1517
- Email: moc.hcetnifnoinu@ecivres
- Address: Telliskivi tn 60-2i hoone, 10412 Tallinn, Estonia
- LinkedIn: www.linkedin.com/company/union-fintech
10. Speednet
Speednet has an Estonian entity in Tallinn and long experience in banking and fintech development. It works for banks, fintech startups, investment firms, and other financial institutions. It builds custom platforms and modernizes existing ones.
Its engineers work in Java, Python, C#, Kotlin, and JavaScript. That helps when extending existing banking systems or building new apps around established financial infrastructure. Choose Speednet when you need engineers who already know banking workflows, not a general team learning the domain on the job.
Key Facts
- Best for: Banking software development and modernization
- Core services: Custom development, product engineering
- Technologies: Java, Python, C#, Kotlin, JavaScript
- Location: Tallinn, Estonia
- Notable strength: More than two decades of banking and fintech experience
Contact Information
- Website: speednetsoftware.com
- Phone: +48 795 439 437
- Email: lp.tendeeps@selas
- Address: Lootsa TN 8A,11415 Tallinn, Estonia
- LinkedIn: www.linkedin.com/company/speednetpl
- Facebook: www.facebook.com/speednetpl
- Twitter: x.com/speednetpl
- Instagram: www.instagram.com/speednet.pl
11. Serokell
Serokell has an office in Tallinn and builds highly technical fintech software. It focuses on dependable financial infrastructure, data processing, payments, fraud detection, and distributed systems. Its stack includes Haskell, Rust, Python, Elixir, TypeScript, and Nix, languages often used for demanding backend systems.
Serokell is a more specialized choice than a typical mobile or web agency. It fits products where correctness, data processing, distributed architecture, or unusual technical requirements matter most.
Key Facts
- Best for: Technically complex fintech infrastructure
- Core services: Fintech engineering, AI, data systems, custom software
- Fintech areas: Payments, fraud detection, financial infrastructure
- Location: Tallinn, Estonia
- Notable strength: Functional programming and advanced backend engineering
Contact Information
- Website: serokell.io
- Phone: (+372) 699-1531
- Email: oi.llekores@ih
- Address: Pille tn. 11/1-32, Kesklinna linnaosa, Tallinn, Harju maakond, 10138, Estonia
- LinkedIn: www.linkedin.com/company/serokell
- Facebook: www.facebook.com/serokell.io
- Twitter: x.com/serokell
12. Advapay
Advapay has a Tallinn office and sells products and services built for fintech businesses. It offers digital core banking software, fintech licensing support, BaaS connectivity, payment infrastructure, and integrations. It also does extra development around its banking platform.
Advapay is not a general custom software studio. It fits projects that launch or extend an e-money, payment, neobanking, or other regulated financial product. Its core banking platform comes with different deployment and licensing options, including source code access and extra custom development.
Key Facts
- Best for: Core banking, payments, and fintech infrastructure
- Core services: Core banking software, integrations, fintech implementation
- Fintech areas: Payments, e-money, digital banking, BaaS
- Location: Tallinn, Estonia
- Notable strength: Purpose-built fintech platform combined with implementation services
Contact Information
- Website: advapay.eu
- Phone: +372 635 51 08
- Email: ue.yapavda@ofni
- Address: 7B Narva maantee, Tallinn, 10117
- LinkedIn: www.linkedin.com/company/advapay
- Facebook: www.facebook.com/advapay.eu
- Twitter: x.com/advapay_eu
Conclusion
Tallinn is a particularly interesting market for fintech software development because the local ecosystem combines strong engineering talent with practical experience in digital banking, payments, lending, investment technology, and regulatory-heavy financial products. The options range from smaller product-focused teams to larger engineering providers capable of handling complex modernization and enterprise-scale systems.
The right choice depends less on company size and more on the kind of financial product being built. A payment platform may require deep integration and security expertise, while a lending or investment application may place more weight on data processing, compliance workflows, and scalable backend architecture. For established financial institutions, experience with legacy systems and long-term modernization can matter just as much as speed of development.
Overall, Tallinn offers a solid mix of fintech expertise, technical depth, and flexible delivery models. The strongest development partner will be the one whose experience matches the product, regulatory environment, technology stack, and expected scale of the project.