Senior Frontend Engineers
Fast, accessible interfaces for complex products: payment consoles, ordering flows, dashboards, design systems and forms that handle messy real-world data.
- React
- Next.js
- TypeScript
- Astro
- Tailwind CSS
- Salesforce LWC
About Soulf
From idea to production. One engineering partner.
Soulf supports the complete software development lifecycle. One team takes your product from the first interface sketch through backend infrastructure, testing and production delivery, with senior engineers accountable at every step.
Web and mobile apps
Interfaces, mobile apps and design systems
Backend infrastructure
APIs, services, data and integrations
Testing and QA
Automated suites and hands-on validation
Production delivery
Reviewed, released and ready to scale
Built with the stacks your teams already run
- React
- Next.js
- React Native
- Swift
- Kotlin
- Node.js
- Java
- PHP
- .NET
Team
A senior crew, not a bench of juniors
Every engagement is staffed by people who have shipped production software for years.
Senior Mobile Engineers
Native and cross-platform iOS and Android apps, shipped end to end through App Store and Google Play review and release.
- React Native
- Swift
- Kotlin
- Flutter
Senior Backend Engineers
APIs, integrations and data pipelines that hold up under regulated, high-volume workloads such as bank file processing and payments.
- Node.js
- Bun
- Java
- .NET
- PHP
- PostgreSQL
- AWS
UI/UX Design Directors
Research, user flows and Figma design systems with specs precise enough that engineers can build them without guesswork.
- Product discovery
- Figma
- Prototyping
- Design systems
QA Engineers
Test strategy, automated end-to-end suites and hands-on exploratory testing. Nothing reaches your users without passing a release gate.
- Playwright
- Cypress
- API contract tests
- Regression suites
How we use AI
Humans steer. Agents execute.
AI takes the repetitive, parallelisable work. People own the problem, the design, the plan and the final call.
Built into the workflow
AI is not an occasional shortcut. Specialized agents are part of how every feature is planned, built, tested and documented.
Orchestrated by engineers
Senior engineers define the approach, split the work and direct agents running in parallel across the codebase.
Humans own quality
Nothing reaches production without senior engineering review. Agents add capacity; accountability stays with people.
Our house rules for AI
- An agent never merges its own code.
- Your code, data and credentials stay inside the boundaries your security team sets.
- We tell you where AI was used and how it was reviewed.
- We measure speed in shipped outcomes, not lines of code.
Technologies
A modern, proven technology ecosystem
We work across the stacks serious products run on, and pick the right tool for your architecture rather than forcing ours.
Frontend
- React
- Next.js
- Astro
- JavaScript
- TypeScript
- Tailwind CSS
Mobile
- React Native
- Swift
- Kotlin
- Flutter
- App Store and Google Play releases
Backend
- Node.js
- Bun
- Java
- PHP
- .NET
- PostgreSQL
AI
- Claude Code
- Codex
- Model Context Protocol
- Multi-agent workflows
Quality Assurance
- Playwright
- Cypress
- API contract tests
- Regression suites
Infrastructure / Delivery
- AWS
- GitHub Actions
- CI/CD pipelines
- Feature-flag releases
What does an engagement with Soulf look like?
Most clients work with a dedicated squad: a design director, two to four senior engineers and a QA engineer. We can also join your existing team to add capacity, or take a fixed-scope project from discovery to launch.
Are our code and data safe when you use AI tools?
Yes. We only use enterprise-grade AI tools configured so your code is not used to train models, every change is reviewed by a senior engineer, and we follow whatever boundaries your security team sets, including keeping specific repositories or data off-limits to AI.
Will you work inside our tools and rituals?
Yes. We join your Slack, standups, planning and demos, and work in your GitHub, Jira or Linear. We keep substantial overlap with US business hours so decisions never wait a day.
Which industries do you have experience in?
Our deepest experience is in fintech and payments and in life sciences, where accuracy and compliance matter as much as speed. The same way of working applies to any product with real users and real stakes.
How quickly can a team start?
Usually within a couple of weeks. We start with a short discovery phase to understand your product and codebase, so the first sprint delivers working software rather than setup.
Let's build something extraordinary.
Whether you need a full product team or additional engineering firepower for your next sprint, Soulf can help you move from idea to production faster.
Or email us directly at marcelo.mendes@soulfcompany.com