A bank can own a portal with a hundred features that a customer logs into once a quarter, and still make their transfers in a different provider’s app. The problem is rarely a missing feature; it is almost always whether customers actually use what is there. For a Head of Digital, that means the success of an online banking portal is not measured by the list of shipped modules, but by how much customers handle online without calling or walking into a branch.
In our experience, what decides success is unglamorous: speed, predictability, security without friction, and a clean connection to the bank’s systems. We have built platforms like this for years. For a leading bank with a strong presence across the CEE region we co-built a digital platform for corporate clients, meeting very demanding expectations around specific programming languages and technologies.
What does a bank customer expect online today?
Your customer no longer compares your portal with a competitor’s portal. They compare it with every other app they use daily, and they expect the same fluency. Login should be instant, the balance visible at once, and the most common action reachable in two or three steps.
Corporate banking adds a different weight to each action. A retail customer checks a balance; a corporate customer authorises a multi-level transfer for a large sum, manages team permissions, and pulls data into their own systems. A single portal has to serve both worlds without dumbing down the corporate side or overwhelming the retail one. That tension between simplicity and depth is the heart of designing online banking.
What really decides whether an online banking portal gets used?
Whether a customer comes back usually turns on three things that never show up in a feature matrix:
- UX matched to the task - frequent actions on top, rare ones tucked away, zero wasted clicks on the critical path,
- performance and predictability - the portal responds just as fast at the 9 a.m. peak as it does overnight, with no freezing during authorisation,
- accessibility and WCAG - the portal works for people using screen readers and keyboard navigation, which in banking is also a compliance requirement,
- trust - the customer can see that their money and data are safe, and that security does not get in the way at every login.
Only the sum of these turns “I have an account at this bank” into “I handle everything in this portal”.
How do you design the portal architecture and backend?
An online banking portal is several layers that must work together: the frontend the customer sees, the business-logic layer, the integrations with the bank’s core, and the security layer that ties it all together. We design them so that one can evolve without rewriting the rest.
The backend of such a platform has to be resilient and auditable, not just fast. Every financial operation needs a trail, data consistency, and clear error handling, because a bank has no room for a “transfer that maybe went through”. So we lean on a modular or microservice architecture where it is justified, with clean separation of responsibilities and well-documented APIs. That foundation lets you add channels and features over years, rather than building everything at once for launch day.
How do you handle security and compliance in online banking?
In a bank, security is not an extra feature; it is the condition for the portal to exist at all. We design it in from the start rather than bolting it on at the end:
- strong authentication and authorisation (MFA, SCA) wired in to protect rather than frustrate,
- data encryption in transit and at rest, plus secure secrets management,
- full auditability of operations and access, ready for the regulator,
- compliance with sector regulation (PSD2, GDPR, supervisory guidelines, and more) built into the processes, not into after-the-fact documentation.
For a private banking institution, since 2017 we have developed its security systems and client-facing digital platforms, so we know this layer most often decides whether a project can even get off the ground.
How do you integrate the portal with the bank’s systems?
A portal is rarely built on a blank slate. It usually has to talk to the core system, transaction banking, card systems, the data warehouse, and a dozen services that have accumulated over decades. Integration, not the interface itself, is often the hardest part of the project.
We approach it from contracts and data: we pin down exactly what the portal reads and writes, through which APIs, and with what consistency guarantees. Where source systems are old or closed, we build a mediation layer that insulates the portal from their limitations. That way a modern frontend is not held hostage by the pace of change in the bank’s core, and both can evolve at their own rhythm.
How do you ensure performance and scale under bank-wide traffic?
Online banking has peaks: payday, month-end, the trading session. The platform has to hold its response times even when half the customers log in at once. We look after this on several levels:
- horizontal scaling of critical services (containerisation, orchestration) so peak traffic does not take the whole thing down,
- query and data-layer optimisation, because that is usually where the bottlenecks form,
- caching and asynchronicity where the customer does not need every step in real time,
- monitoring and observability with real alerts you see before a customer calls.
The goal is not a record in a load test, but a portal that is just as fast on the worst day of the month as on the quietest one.
Which skills do we provide for a banking project?
We shape the team around the specific platform and its stack, not around a ready-made template. On bank projects we most often staff:
- architects and backend developers building the platform core and its APIs,
- frontend developers owning the portal and its UX,
- security engineers guarding authentication, encryption and compliance,
- DevOps and QA specialists responsible for stable releases and quality.
In banking it also matters that we match people to the required technologies, even unusual ones - as in the corporate project, where very specific programming languages were key.
How do we do it at RITS?
We do it as a nearshore partner from Poland, with real, long-standing experience in the banking sector:
- for a leading corporate, investment and retail bank with a strong CEE position we co-built a digital platform for corporate clients, meeting very demanding expectations around specific programming languages,
- for a leading private banking and asset management institution we have, since 2017, developed internal systems, security systems and client-facing digital platforms, engaging close to 90 specialists,
- we join frontend, backend, security and integrations into one maintainable whole,
- we verify skills before the start and shape the team around a given bank’s technologies and requirements.
Most often we deliver this as custom software built by our team and, where a bank needs to top up specific skills fast, as team augmentation or a dedicated team.
Where do you start with an online banking portal?
Start from the single most common customer task - a transfer, an authorisation, a data lookup - and count how many steps separate the customer from getting it done today. That exercise reveals where you are losing real usage faster than another list of features to add. From it follow the portal’s scope, the demands on the backend and integrations, and the roles you need on the team. We covered the differences between engagement models in our article on IT engagement models.
Designing or developing a portal and online banking? Let’s talk - we’ll match a team and an architecture to your bank and your customers.