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Software engineering consultancy

WSS IT designs, builds and modernizes systems for companies that need senior engineering, backed by real-world experience in financial services, banking and U.S. mortgage technology.

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13+ years of engineering on projects for

  • HSBC
  • Caixa Econômica Federal
  • Banco Votorantim
  • RCI Banque (Renault)
  • Philips
  • Lorenzetti
  • RE/MAX
  • Finaxis

Projects delivered throughout the founder’s career through technology and consulting firms.

Warning signs

The costs you’ve learned to live with.

If any of this sounds familiar, there’s a system asking for real engineering, and the cost of waiting only grows.

  • Your systems don’t talk to each other, so someone copies data from one screen to another every day.

  • An integration fails silently, and you only find out when a customer complains.

  • Nobody wants to touch the legacy system, because the people who understood it have left.

  • The same bugs keep coming back to production, and the root cause is still unknown.

  • You hired a vendor, but no one on your side can assess what was delivered.

About WSS IT

We’re engineering partners, not just vendors.

We understand the problem before writing code, we say so plainly when something doesn’t make sense, and we only move forward together when the outcome is worth it for your business.

  1. Senior engineering, no middlemen

    You talk directly to the people who design and write the code, in English or Portuguese.

  2. Experience with critical systems

    13+ years in banking, financial services and U.S. mortgage technology, where data and integrations can’t fail silently.

  3. Technical candor

    If the simplest solution works, we recommend the simplest one. If the project doesn’t make sense, we tell you before we start.

Services

Engineering for the problems that actually matter.

Every engagement starts with the business problem. Technology comes second, and has to pay for itself.

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01

Custom software

Platforms, portals, dashboards and internal systems designed around how your operation actually works.

  • Dashboards
  • Admin systems
  • SaaS
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02

System & API integration

Connecting internal systems, third-party APIs, financial platforms and legacy software, traceable and without data loss.

  • REST APIs
  • Webhooks
  • XML
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03

Backend & architecture

APIs, async processing, queues and jobs designed for reliability, observability and long-term evolution.

  • Node.js
  • TypeScript
  • Java
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04

Modernization & support

Diagnosing production bugs, performance issues and broken integrations, and modernizing legacy systems step by step.

  • Troubleshooting
  • Production bugs
  • Performance
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05

AI & Automation

AI applied to concrete processes: documents, email, classification, data extraction and reporting.

  • AI automation
  • LLM integration
  • AI agents
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06

Technical consulting

Architecture and code reviews, technical planning and a second opinion before major decisions.

  • Architecture review
  • Code review
  • Technical planning
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Case studies

Hard problems, solved in production.

Engineering challenges from real-world systems, from financial platforms to vehicle tracking.

Vehicle tracking · Sascar

TacWeb: stabilizing a vehicle tracking platform

Outcome

Platform’s most important customer retained

See challenge and solution

Challenge

TacWeb, Sascar’s vehicle tracking and monitoring system, was weighed down by several legacy systems, a massive database that frequently locked up and inconsistent data, putting the platform’s most important customer, Besalco, at risk.

Solution

Technical leadership of the project: diagnosing and fixing the database lockups, the legacy system issues and the data inconsistencies, working directly with Besalco’s team in Spanish.

Outcome

Platform stabilized and its most important customer retained.

  • Technical leadership
  • Legacy systems
  • Databases
  • Data consistency
  • Spanish

Wemlo · Mortgage tech (U.S.)

Bidirectional MISMO conversion layer

Outcome

MISMO import and export in both directions

See challenge and solution

Challenge

A mortgage loan origination platform needed to import and export loan data in the industry-standard MISMO XML format while preserving its internal model.

Solution

A bidirectional interoperability layer with mapping, validation and version compatibility, enabling consistent import and export.

  • Node.js
  • TypeScript
  • XML
  • MISMO

Wemlo · Mortgage tech (U.S.)

Defensive lender synchronization

Outcome

User-entered data preserved

See challenge and solution

Challenge

Lender integrations could return partial XML. Applying the payload as-is would wipe out fields users had already filled in.

Solution

A defensive sync strategy that preserves existing data whenever the external payload carries no new value.

  • Node.js
  • TypeScript
  • XML
  • MISMO
  • APIs

Financial services

Resilient third-party integrations

Outcome

Dependable processing despite external failures

See challenge and solution

Challenge

Integrations with external systems suffered from intermittent failures, timeouts and inconsistent responses.

Solution

Retries with exponential backoff, circuit breakers, background jobs, structured logging and monitoring for dependable processing.

  • Node.js
  • TypeScript
  • Agenda Jobs
  • Datadog

Banking · Brazil

Fixed-income securities registration

Outcome

CIP/C3 data exchange integrated with internal systems

See challenge and solution

Challenge

A financial institution needed to exchange fixed-income securities data with Brazil’s CIP/C3 registration platform.

Solution

An integration with an XML conversion layer between the registration platform and internal banking systems, using asynchronous messaging.

  • Java
  • Angular
  • XML
  • RabbitMQ

How we work

How WSS IT works.

Four steps, small and frequent deliveries, and direct access to the people writing the code.

  1. Discovery

    We talk to the people who live the problem and map the current process, constraints, risks and expected outcome.

  2. Planning

    We define architecture, scope and priorities, and present a clear delivery plan before any development starts.

  3. Development

    Incremental implementation with code review, automated tests and validation with your team before each release.

  4. Delivery & evolution

    Deployment, documentation and monitoring. Then we keep evolving the system with you, or prepare your team to take over.

Industries

Industries where we’ve already delivered.

Experience built on real projects throughout the founder’s career. Select an industry to see what was done.

Banking

Systems and integrations for HSBC, Caixa Econômica Federal, Banco Votorantim and RCI Banque (Renault Financial Services), including an investment simulator for HSBC Private Banking clients.

  • Java
  • Spring
  • Angular
  • Camunda BPMN

Technologies we use in production

  • TypeScript
  • Node.js
  • Vue.js
  • Nuxt
  • Angular
  • Java
  • Spring
  • MongoDB
  • PostgreSQL
  • Redis
  • RabbitMQ
  • Docker
  • Kubernetes
  • Datadog
  • Prometheus
  • SonarQube
  • Camunda BPMN

Wagner Santos Silva

Founder · Senior Full Stack Software Engineer

View LinkedIn profile

Who’s behind it

Senior engineering, no middlemen.

13+ years building enterprise software for banks, financial services and mortgage technology. Since 2021, Master Software Engineer on a mortgage Loan Origination System (LOS) for the U.S. market.

  • At Wemlo, a U.S. mortgage LOS platform: MISMO XML interoperability layer and Fannie Mae, Freddie Mac and UWM integrations
  • Systems for HSBC, Caixa, Banco Votorantim, RCI Banque and Finaxis
  • Technical leadership of teams and projects at technology consultancies
  • Legacy modernization, such as migrating Philips’ Tasy system to the web
See full career history

FAQ

Frequently asked questions

Didn’t find what you were looking for? Write to [email protected].

Does WSS IT build systems from scratch?

Yes. We build custom systems from a real business need or process, going through discovery, planning, incremental development and delivery.

Can you integrate systems we already use?

Yes. Integration is one of our core specialties: internal systems, third-party APIs, financial platforms and legacy software, using REST, XML, webhooks and messaging.

Do you take over existing or legacy systems?

Yes. We diagnose production bugs, analyze performance, fix broken integrations and modernize step by step, without rewriting everything at once.

Can we hire just a technical assessment?

Yes. Architecture reviews, code reviews and technical planning are available as standalone engagements, with no full project required.

Do you work with companies outside Brazil?

Yes. We have ongoing experience with the U.S. market and work remotely in English and Portuguese.

How does the quote process work?

You describe the problem, idea or opportunity. We review the context, talk through open questions and come back with a technical and commercial proposal.

Next step

The next step is a conversation.

Describe the problem, idea or opportunity. We’ll reply with clear next steps, no strings attached.

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