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 focuses heavily on software engineering for regulated financial products. Its work covers digital banking, lending, payments, wealth management, trading platforms, onboarding, KYC and AML workflows, financial data systems, and core banking integrations. The company also handles legacy modernization, DevOps, fintech UI/UX, AI implementation, and staff augmentation.
For Tallinn-based fintech companies that need access to an established European delivery operation rather than a local Tallinn office, Itexus is particularly relevant for complex products with multiple financial integrations, security requirements, and high transaction loads. Its published portfolio includes digital wallets, banking applications, 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: Żurawia 6/12/lok 776, 00-503, 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-based custom software development company with a dedicated fintech practice. Its financial development work ranges from personal finance and lending applications to digital banking platforms and enterprise financial systems. The team also offers fintech consulting, backend and mobile development, MVP development, and post-launch support.
Its Tallinn location makes Bamboo Agile a straightforward option for businesses that want an Estonian engineering partner with direct exposure to the country's fintech environment. The company emphasizes payment integrations, transaction processing, security, fraud-related functionality, and EU data protection requirements in its financial projects.
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 software experience to the Tallinn market. The company has built internet banks, rewritten core systems for financial institutions, created end-to-end lending systems, and supported fintech companies entering additional countries. A recent banking project involved delivering a working banking core, SEPA payments, and PSD2 APIs within an eight-month regulatory deadline.
Its delivery model is unusually engineering-led, with pair programming, test-driven development, and direct communication between developers and clients. That approach is particularly relevant where financial software contains complex business rules and long-term maintainability matters as much as getting the first release live.
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 combines a substantial Tallinn presence with a broad financial software development practice. Its fintech services include banking platforms, investment and brokerage software, cards and payments, accounting systems, risk modelling, fraud detection, data analytics, and customer-facing financial applications.
The company can take on research and consulting, business analysis, product engineering, data and AI work, and modernization within the same engagement. This makes ELEKS more suitable for complex or enterprise-scale financial transformation programs than projects that only require a small isolated application.
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 combines a Tallinn legal presence with custom software engineering for financial applications. Its software development offering specifically includes finance software, while its wider capabilities cover web, mobile, desktop, backend applications, cloud infrastructure, integrations, AI, QA, and dedicated engineering teams. OSKI has also published its own work on custom fintech software development, with attention to security, financial workflows, integrations, and maintainability.
For fintech projects, the company fits situations where financial functionality is part of a larger custom system and needs to connect with cloud infrastructure, internal applications, 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 maintains an office in Tallinn and develops fintech applications for personal and corporate finance, mobile banking, financial risk analysis, investment management, and digital asset products. Its mobile development service also references GDPR and PCI DSS requirements for financial applications.
This mix makes the company worth considering where a fintech project has a strong mobile component but still requires backend services, APIs, payment integrations, and financial business logic. Its Estonia office gives buyers a local Tallinn point of presence while the company also operates 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 provides software engineering specifically for banking and financial services. Its fintech offering covers digital banking, payment systems, lending platforms, security and risk management, blockchain, AI, and data-intensive financial applications.
The company can provide complete product development or dedicated teams, making it relevant to both new fintech products and established organizations expanding engineering capacity. Published project material also shows work on investment and wealth management software, including data processing and reporting functionality.
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 centered on high-load financial systems. Its work covers trading and payment infrastructure, crypto platforms, CRM systems, internal tools, and surrounding web applications. Security practices include least-privilege access, MFA, logged access, backups, disaster recovery testing, and security review within the development process.
The company is particularly relevant for fintech businesses where system reliability and architectural decisions have a direct impact on transaction processing or operational continuity. Its delivery model supports dedicated teams as well as fixed project engagements.
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 concentrates specifically on technology for banks, credit unions, lenders, payment providers, fintech companies, insurers, and other financial businesses. Its platform covers areas such as customer records, payments, accounting, reporting, messaging, and deal management.
Beyond its own digital core, the company offers strategy, UX, service design, custom software engineering, testing, MVP development, and full product delivery. That combination can be attractive to companies that need both established financial modules and custom engineering rather than building every element of a financial platform from zero.
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 operates an Estonian entity in Tallinn and brings long-running banking and fintech development experience to projects. Its financial software work covers banks, fintech startups, investment organizations, and other financial institutions, with capabilities spanning custom platform development and modernization.
Its engineering stack includes Java, Python, C#, Kotlin, and JavaScript, giving it flexibility when extending existing banking environments or developing new applications around established financial infrastructure. Speednet is particularly relevant when a project requires software engineers who already understand banking workflows rather than a general-purpose development team learning the domain during delivery.
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 develops fintech software with a particularly technical focus on dependable financial infrastructure, data processing, payments, fraud detection, and distributed systems. Its technology stack includes Haskell, Rust, Python, Elixir, TypeScript, Nix, and other languages often associated with technically demanding backend systems.
This makes Serokell a more specialized choice than a conventional mobile or web agency. It can be relevant where correctness, data processing, distributed architecture, or unusual technical requirements carry significant weight in the product.
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 combines a Tallinn office with a product and services model built specifically for fintech businesses. Its offering includes digital core banking software, fintech licensing support, BaaS connectivity, payment infrastructure, integrations, and additional development around its banking platform.
Unlike a general custom software studio, Advapay is most relevant when the project revolves around launching or extending an electronic money, payment, neobanking, or other regulated financial product. Its core banking platform can be provided under different deployment and licensing arrangements, including options involving source code and additional 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.