Independent software studio
Focused tools. One problem at a time.
Acorn Juice Solutions is a studio founded by two partners with extensive experience in software development and infrastructure implementation, based in Navarra, Spain. We build scalable, well-crafted software — from utilities and widgets to mobile apps, websites, APIs, pipelines and cloud infrastructure — that solves real problems for real people and teams.
What we make
A mix of commercial products and free utilities. Carefully maintained and monitored.
What else we do
Beyond our own products, we also work with teams as an extension of theirs. A short, honest list of what we can take on:
- Cloud migrations and modernisation
- From on-prem or legacy environments to well-architected cloud platforms on Microsoft Azure, Amazon AWS or Google Cloud. Migration planning, cost modelling, and hands-on execution.
- CI/CD pipelines
- Analysis and definition of build, test and release pipelines applying modern best practices — reproducible builds, gated releases, secret hygiene and rollout safety by default.
- Full-stack software delivery
- Java, .NET, Python, Node.js, Angular. Backend services, APIs, front-ends and the database work that ties them together. Comfortable across stacks and legacy code.
- Infrastructure and networking
- DevOps automation, environment provisioning, monitoring and networking — including Mikrotik router configuration for on-prem or hybrid setups.
- Training and digital skills
- Technical training for developer teams (best practices, security, CI/CD, cloud) and digital-competencies sessions for non-technical staff. Sessions in Spanish or English, remote or on-site, tailored to the team's starting level.
How we work
Every product and every engagement — commercial or not — follows the same five principles.
- Best practices, by default
- Code review, tests (unit, integration and E2E), documented conventions and CI that fails loud. Nothing ships that we would not be comfortable handing off to a senior partner.
- Proven patterns over shortcuts
- Design patterns and architectural choices with a track record. We reach for the well-understood solution first, and only consider the clever one when it truly fits.
- Security is not an afterthought
- Input validation at trust boundaries, secrets kept out of the repo, principle of least privilege, auditable dependencies. Built in from the first commit, not bolted on before release.
- Iterative, reviewed delivery
- We work in short cycles: sprint planning, incremental delivery and client review every iteration. Adjusting early is cheaper than fixing later.
- Time well spent
- We take time seriously: short, agenda-driven meetings, automation for anything that repeats, and focus on the work that adds value. Less noise, more outcome.
Experience
Over 25 years delivering custom software for clients in demanding sectors: international banking, public sector, industry, construction and more. We work fluently in English and have collaborated with international teams across Europe — engagements can run in English or Spanish. Domains we've worked in:
- Retail banking
- Corporate banking
- Fintech & payments
- Savings banks
- Public safety
- Justice
- Insurance
- Construction
- Industry
- Engineering
- Occupational health & safety
- Transport
- Innovation projects
The team. Complementary skills.
Every product gets personal attention and reflects the work of the team behind it.
What clients say
A small selection of feedback from teams we have worked with since 2019.
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Working with Iosune and Javier has been an excellent experience. They stand out for their outstanding level of professionalism and their ability to grasp project requirements right from the start. On top of that, they deeply value both their time and their clients’, keeping meetings to the strict minimum without losing an ounce of clarity or alignment. A highly efficient team, and one I would recommend for any software development work.
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They scoped the project to what we actually needed, without oversizing the infrastructure. Some rescoping at the start, but flawless from there.
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They were not the cheapest option we quoted, but they were the most cost-effective in the long run. The dashboard they built is still running two years later, without a single corrective intervention.
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They turned a complex compliance requirement into a simple, maintainable module, tailored exactly to what the regulation required. No over-engineering, no cutting corners.
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Very strong engineers, especially on architecture. Not the cheapest option out there — you see it on the invoice — but you also see it in the quality of what they deliver.
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Professional delivery overall. Communication in the early phase could have been sharper; once we aligned on scope, everything went smoothly.
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Technical rigor and honest about trade-offs. They never sold us a brilliant architecture when the boring one was the right call. Highly recommended.
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Genuinely strong engineers. They took a tangled legacy codebase and delivered something simple where it needed to be and robust where it had to be. Simple solutions to complex problems, exactly.
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Technically excellent. They refactored a critical legacy service without breaking anything, with test coverage that still gives us confidence months later.
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They delivered exactly what we needed, not a line more. No over-engineering, no features nobody would use. The experience shows.
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Professional, straightforward, no fluff. They find simple solutions to complex problems and deliver when they say they will. I would hire them again tomorrow.
Get in touch
Have a question, an idea, or a project you want us to look at? Drop us a line.