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Selected engagements

Work shaped by real operational constraints.

  1. 01

    Banking & Fintech

    Source-code audit and white-box testing for a digital wallet platform

    Context

    A digital wallet platform needed an outside engineering read on its own codebase before continuing to build on it — the kind of review a team cannot easily run on its own work.

    Challenge

    Years of feature growth on a live financial platform had left code paths that no one on the client side could confidently say were still correct, secure or necessary.

    Contribution

    We ran a structured source-code audit and white-box testing pass across the platform's active development, reviewing implementation against both internal standards and general secure-coding practice, and reported findings the client's own team could act on directly.

    JavaSpringHibernate

    Assurance

    Findings were mapped against secure-coding and code-quality requirements rather than checked off against a certification — Warmbytes does not hold or claim PCI DSS, ISO 27001 or any other certification on the client's behalf.

    Outcome

    The client's engineering team gained a concrete, prioritized list of code-level risks and a clearer picture of which parts of the system were safe to keep extending.

  2. 02

    Data-Intensive Enterprises

    Data warehouse and reporting platform for a financial institution

    Context

    A financial institution's operational data was spread across systems that could each answer questions about themselves but not about the business as a whole.

    Challenge

    There was no single, reliable place to consolidate transactional and operational data for reporting, and no real-time visibility into how the underlying systems were performing.

    Contribution

    We built an end-to-end data warehouse and reporting pipeline using Apache NiFi for ingestion and Apache Superset for reporting, and separately stood up an ELK-based observability stack so operational health could be monitored as it happened. We also delivered an internal ticketing system to route issues surfaced by that monitoring.

    Apache NiFiApache SupersetElasticsearchLogstashKibana

    Assurance

    Data pipelines were built with access boundaries appropriate to financial data; no certification is claimed for the resulting platform.

    Outcome

    The institution gained a consolidated reporting layer built from previously scattered sources, and an observability stack that made system health visible instead of inferred after the fact.

  3. 03

    Banking & Fintech

    International branchless-banking platform build

    Context

    A branchless-banking operator outside Pakistan needed a microbank platform built from the ground up — core backend, back-office tooling, and customer- and agent-facing mobile apps.

    Challenge

    The platform had to handle real financial transactions correctly and securely from day one, including compliant message handling for interbank and card-network transactions, without an existing system to fall back on.

    Contribution

    We built the backend on Java, Spring and Hibernate, delivered a JSP-based back-office portal for internal operations, native iOS and Android apps for customers and agents, and implemented the ISO 8583 protocol for secure financial transaction messaging.

    JavaSpringHibernateJSPiOSAndroidISO 8583

    Assurance

    Transaction messaging was implemented against the ISO 8583 specification; this is a protocol-conformance statement, not a claim of any regulatory or security certification.

    Outcome

    The operator launched with a working microbank platform spanning backend, back office and mobile — a foundation it could continue to build features on rather than a one-off delivery.

  4. 04

    Payments & Commerce

    Merchant QR payment-facilitator infrastructure

    Context

    A financial institution needed to offer merchants QR-based payment collection built on its country's national instant-payment rail, rather than a proprietary scheme merchants would need to be onboarded to separately.

    Challenge

    Merchants needed a way to generate and accept both static and dynamic QR codes for payment collection, with an integration path simple enough for third parties to build against, plus a portal their own staff and the institution's admins could operate.

    Contribution

    We built a QR payment system integrated with the country's national instant-payment rail, exposing RESTful APIs — built on Java and Spring Boot — for merchant integration, alongside a merchant and admin portal built in Angular for day-to-day operation.

    JavaSpring BootAngularREST APIsInstant payments

    Assurance

    API access and merchant onboarding were scoped with payment-facilitator security practice in mind; no certification is claimed for the deployed system.

    Outcome

    The institution gained a QR payment collection system merchants could integrate against directly, with an admin portal giving its own team operational control instead of dependency on Warmbytes for day-to-day changes.

  5. 05

    Banking & Fintech

    Specialist engineering teams for a branchless-banking platform

    Context

    A branchless-banking platform already in production needed engineering capacity that could sit inside its own delivery process on an ongoing basis, rather than a separate vendor team working at arm's length.

    Challenge

    The platform had to keep resolving live issues and adding features while staying aligned with the regulatory obligations of a licensed financial platform, and needed engineers experienced enough to be trusted with both.

    Contribution

    We embedded a mixed-seniority Java engineering team directly into the client's existing delivery process — resolving production issues, building new features, and maintaining adherence to the platform's regulatory obligations as an ongoing responsibility rather than a fixed-scope project.

    JavaSpringHibernate

    Assurance

    Regulatory-adherence work was carried out to the client's own compliance requirements; Warmbytes does not hold or claim any banking or security certification of its own.

    Outcome

    The platform kept shipping fixes and features on a live financial system without the disruption of onboarding a new team for each piece of work, and retained continuity of engineers who understood the system's history.

  6. 06

    Enterprise Operations

    ERP, digital archive and workflow automation

    Context

    Two enterprise clients were running document-heavy operations largely on manual, paper-based processes, with no consistent way to search past records or route internal requests.

    Challenge

    Document handling and inter-departmental requests depended on manual tracking, which made process delays and lost documents hard to catch until they had already caused a problem.

    Contribution

    We deployed tailored ERP solutions and digital archive systems to bring document management under one platform, and separately configured a chatbot to automate routine customer and internal communication for another enterprise client.

    ERPDigital archivingWorkflow automationChatbot configuration

    Assurance

    Access to archived and automated records was scoped to each organization's existing internal controls; no certification is claimed for the deployed systems.

    Outcome

    Both organizations moved document handling and routine communication off manual, ad hoc processes and onto systems that kept a consistent, searchable record.

  7. 07

    Banking & Fintech

    Enterprise service bus configuration audit for a commercial bank

    Context

    A commercial bank's enterprise service bus — the integration layer connecting its core systems — had been configured and extended over time by different teams, with no recent independent check on whether the production setup still matched intended standards.

    Challenge

    The bank needed to know whether its production ESB configuration actually matched documented standards, without disrupting a live integration layer that other systems depended on.

    Contribution

    We audited and evaluated the bank's production ESB implementation against its intended configuration standard, identifying where the deployed setup had drifted from what was documented.

    Enterprise Service BusConfiguration audit

    Assurance

    The audit assessed configuration against the bank's own standards and general integration-security practice; it is a configuration-conformance review, not a certification of the bus or the bank's infrastructure.

    Outcome

    The bank received a clear picture of where its live ESB configuration diverged from standard, giving its own infrastructure team a concrete basis for remediation.