ESEN
// custom software

Software tailored to your business, without limits.

We design and build custom software, SaaS platforms and automations that solve real problems. From idea to production, built to support our clients as they grow.

Tell us about your project →Book a 30-minute call (opens in a new tab)
STACK:NestJSTypeScriptPostgreSQLNext.jsPythonDockerAWSGCPJWTOAuthStripeRedisBullMQSupabaseWhatsApp APIMercadoPago
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Projects

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Satisfied clients

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Years of experience

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In production

// services

Backend, SaaS platforms and automation, end to end

Six ways to work together, from a one-off audit to building and running your platform in production.

01

Assessment and audit

A technical review of your architecture and code: we identify gaps in documentation, security and configuration, and deliver a modernization plan with clear priorities, including refactoring of legacy code (PHP, for example).

02

Production-ready backend and APIs

Versioned REST APIs documented with Swagger, built on hexagonal architecture and Domain-Driven Design. We define the API contract before development and back it with automated tests.

03

SaaS platforms

Multi-tenant, multi-location foundations with granular roles and permissions, plans and subscriptions with automatic billing, and audit logging.

04

Automation

Background processing with queues and scheduled jobs, WhatsApp bots, automated reminders and Python data pipelines that give your team time back.

05

Support and evolution

Ongoing support to maintain, improve and grow your software over time.

06

Applied AI

We integrate language models, cloud-hosted or local, for assistants, summaries, classification and automated content validation, with rule-based fallbacks when the model is unavailable.

Not sure where to start?

Tell us about your challenge and we'll propose the shortest path.

Let's talk →
// process

How we work

A clear process from start to finish, so you always know where your project stands and what you get at each stage.

  1. Discovery

    We get to know your business and goals, and define together what to build.

    You get

    Kickoff meeting and defined goals.

  2. Proposal and scope

    Clear scope, timeline and investment, with no surprises or fine print.

    You get

    A document with scope, timeline and a fixed-price investment.

  3. Development

    We build with solid engineering practices and share progress continuously.

    You get

    Short sprints with regular demos and repository access.

  4. Delivery and evolution

    We launch, support you and keep improving your software.

    You get

    Production release and post-launch support.

An MVP is usually ready in 4 to 8 weeks.

// why us

A small team, directly dedicated to every project

Fixed pricing, direct communication and a stack built to last: that's how we build software ready to grow with your business.

∞

Outcome-focused

We charge for the value we deliver, with fixed pricing by scope, not by the hour.

∞

Modern technology

A current, proven stack built to scale and built to last.

∞

Clear communication

We speak your language, not tech jargon. You'll always know what's going on.

∞

From LatAm to the world

Remote work with clients inside and outside the region, with the same quality.

// technical capabilities

What our team masters, from architecture to deployment

Knowledge applied to every project: the practices, tools and integrations we use to build production-ready software.

Architecture and quality

Code designed to grow and change without breaking.

DDDHexagonal architectureModular monolithAutomated tests (Jest, pytest)Code reviewPull requests with approval

Security

Authentication, permissions and traceability by design.

JWT with refresh tokensOAuth2Auth0One-time passcode (OTP) accessRBACWebhook verification (HMAC)Legally binding digital signatures

Integrations

We connect your platform with the services you already use.

WhatsApp Cloud APIMercadoPagoStripeGoogle CalendarVideo calls (Daily.co)Transactional email (Resend)Cloud storage

AI and automation

Processes that run on their own, with language models where they add value.

PythonLanguage models (Groq, Ollama)Queues with BullMQRedis

Cloud and deployment

Infrastructure matched to each product's stage and budget.

AWS (Lambda, S3)Google Cloud StorageDockerRailwayRenderVercelNetlify

How we work

Order and visibility at every stage of the project.

Upfront technical analysisAPI contractPrioritized backlogShort sprintsAI-assisted development
// confidentiality

How we protect your information

Concrete practices to protect your code, your data and your project.

Your code is yours

We work in private repositories, give you access from day one and apply least-privilege permissions for the team.

Test data

During development we use mock data, never your customers' real data.

Confidentiality agreement

We sign an NDA if your project requires one.

Nothing is published without your permission

We don't show information about your project without your authorization.

// clients

What our clients say

Real results from projects delivered to production.

They understood what we needed from day one. The result exceeded our expectations, and the process was transparent from start to finish. I recommend them without hesitation.

JF

Dr. José L. Ferrer

Aesthetic physician · Centro Estético Dr. José Ferrer

We automated processes that used to take up hours every week. The ROI was clear within the first month. Serious work, focused on the business, not just the code.

IM

Ignacio Martínez

Partner · Canarias Equipamientos

// projects

Platforms in production, used by real clients

SaaS platforms, management systems and custom dashboards that clinics, retailers and sales teams rely on every day.

1 / 12

In-house productPractices, smart scheduling and full control of your medical center

ZarMedi — Clinic management SaaS platform

A SaaS platform built and operated by InfinitySoftware for clinics and medical practices: appointment scheduling, medical records, inventory, billing, telehealth and role-based permissions, all in a real-time dashboard designed to cut day-to-day administrative work.

View case: problem, solution and outcome
Problem
Appointments, medical records and patient communication spread across separate, manual tools.
Solution
Scheduling, medical records, telehealth, prescriptions with QR verification, digitally signed consent forms and a 24/7 WhatsApp bot in a single platform.
Outcome
Less administrative work, automated reminders, appointments booked outside business hours, and centralized, secure information.
NestJSNext.jsTypeScriptPostgreSQLRedisBullMQ
Discover ZarMedi →Visit site →

1 / 5

Credit sales, field collections and cash control

Canarias Equipamientos — Credit sales management

An end-to-end management platform for companies that sell equipment on credit: it digitizes the full cycle, from field sales and customer validation to delivery, installment collection on daily routes and cash closing, with role-based dashboards and multi-company operation.

View case: problem, solution and outcome
Problem
Tracking credit sales, deliveries and door-to-door collections relied on manual, scattered processes.
Solution
A platform that brings together sales, customer validation, delivery, installment collection on daily routes and cash closing, with role-based dashboards and multi-company operation.
Outcome
Full control over the lifecycle of every sale, organized collections and up-to-date reports for management.
NestJSNext.jsTypeScriptPostgreSQLTypeORMDocker
Visit site →

1 / 2

Online booking, patient history and treatment follow-up

Centro Estético Dr. José Ferrer — Scheduling and medical records

A web platform that digitizes the center's schedule: online appointment booking, a management dashboard for the team and centralized medical follow-up records, accessible from any device.

View case: problem, solution and outcome
Problem
Appointment scheduling and each patient's follow-up were handled separately and by hand, which made it hard to coordinate the team and keep treatment history at hand.
Solution
A web platform with online booking, a management dashboard for the team and a centralized record of each patient's medical follow-up, accessible from any device.
Outcome
Bookings available around the clock, the team's schedule in one place and treatment history always available.
ReactExpressTypeScriptPostgreSQLTypeORMAWS SES
Visit site →
// team

The people behind it

A small, senior team: you talk directly to the people building your software.

Photo of Orlando Zarraga

Orlando Zarraga

Backend & Architecture

Designs the foundations of every platform so they support real growth, not just the first demo. Experienced in hexagonal architecture and DDD, AI, WhatsApp and payment integrations, and deployments on AWS and GCP.

NestJSTypeScriptPostgreSQLRedisPythonAWS
Photo of Carolina Ariza

Carolina Ariza

Frontend & Product

Turns business goals into simple interfaces that users understand without a manual. Takes care of every detail between the design and the code that ships to production.

Next.jsReactUXTypeScript

Mateo Suárez

Full Stack

Connects backend and frontend in a single flow, with no lost handoffs or pieces that don't fit. Builds each feature end to end: from the database to the screen the client uses.

Next.jsNestJSPostgreSQLTypeScriptDocker
// faq

What you need to know before getting started

Clear answers about pricing, timelines and how we work, before a project begins.

We work with early-stage startups, SMBs going through digital transformation and companies that need to automate or scale their operations. There's no minimum company size, but there is a minimum of clarity about the problem to solve.

It depends on the scope. A working MVP can be ready in 4–8 weeks. A more complex platform can take 3 to 6 months. In our first conversation we'll give you an honest, no-commitment estimate.

Great, that's one of the most common scenarios. We start with a technical assessment to understand where things stand and propose an evolution plan that doesn't break what already works.

We have experience with Next.js, NestJS, Python, PostgreSQL, AWS and more. But we choose the technology based on the problem, not the other way around. If you already use a stack, we adapt to it.

Yes. We integrate language models to automate tasks such as summaries, classification, content validation or assistants, and we choose between cloud and local models based on the privacy and cost you need.

Yes. We work with the official WhatsApp Business API, MercadoPago, Stripe and Google Calendar, among other integrations.

We work in short sprints with frequent deliveries. You'll have repository access, regular demos and direct communication with the team, with no middlemen or generic reports.

We work with fixed pricing by scope, not by the hour. Once we understand your project, we send a detailed proposal with a fixed cost. That way there are no surprises for either side.

// let's talk

Tell us what you want to build

Fill out the form and we'll get back to you within 24 hours, no strings attached.

Prefer to talk it through?

Book a 30-minute call (opens in a new tab)
contacto@infinitysoftware.dev