Hello, I'm
Mariano Gendra
Business first, code second: map the process, define what's worth building, and ship it. One senior developer, AI-assisted.
Custom software for small teams that have outgrown spreadsheets and email.
Turn the spreadsheets your team depends on into a secure web app with logins, validation and reports.
One place to manage orders, clients, inventory or whatever your business runs on.
Let your clients check orders, documents and status on their own, without emailing you.
Already have an old .NET system? Start with a fixed-price 1-week Audit.
How the process works today, who uses it and what it costs.
The smallest version that solves the problem, with clear scope and price.
Small deliveries you can see and test every week, with updates in plain language — no jargon, no surprises.
AI speeds up the work; every decision and every line that ships is reviewed by a senior developer.
I’ve always been driven by curiosity about technology. From exploring every computer I could get my hands on, to studying Computer Engineering — that curiosity became a career.
After several years working in-house at companies, I realized my true calling was working independently: analyzing problems, proposing solutions, and building software that genuinely helps businesses succeed.
I work with startups and small businesses to turn spreadsheet and paper processes into custom software: web apps, admin panels and customer portals. I also modernize legacy .NET systems. I’m certified by AWS as both a Cloud Practitioner and AI Practitioner, and I use AI-assisted development to deliver faster and with fewer defects.
A selection of websites, backends, and products built for clients across industries.
Custom backend platform for one of Argentina’s most prestigious contemporary art galleries. Artwork inventory management, digital catalog creation, sales processing, and artist administration — built for a gallery with international reach.
Hotel website with custom CMS integration. Full design, front-end development, and content management system build.
Card reconciliation platform for businesses. Automates the matching and verification of credit and debit card transactions.
Business website with modern design, responsive layout, and a clean user experience built for the company’s online presence.
Hotel and restaurant directory platform. Backend system handling listings, search, filtering, and content management at scale.
Tourism wholesale platform connecting hotels and travel agencies. Complex pricing, availability, and booking backend system.
Auto parts wholesale backend system. Inventory management, order processing, pricing engine, and client portal for a B2B wholesale operation.
Custom CMS built specifically for the Latitud Hoteles group. Multi-property content management, media library, and publishing workflows.
Call management backend system. Agent assignment, call routing, real-time reporting, and performance dashboards for an internal call center operation.
1 week · fixed price. Not sure where to start with your aging .NET system? In one week I review your code and database and give you a clear plan.
Modules, dependencies, integrations and database, in one clear diagram.
Security, unsupported versions, technical debt and SQL performance, each finding with severity and evidence.
Where to go and why, without a big-bang rewrite.
What to migrate first and how, designed to minimize downtime.
Ranges by phase, with the assumptions written down.
I present the report and answer your questions.
From USD 2,000, fixed.
Under NDA, with read-only access. The report is yours to keep, with me or anyone else. If we continue together within 30 days, the audit fee is credited toward the project.
From in-house engineering to independent consulting — a career built on solving real business problems.
Freelance / Self-Employed
Deliver end-to-end software solutions for SMBs, startups, and enterprise clients across multiple industries. Engagements range from greenfield web applications and REST API development to database architecture and IT consulting. Built and launched 4 proprietary SaaS products. Served 40+ clients, delivered 100+ projects.
Ballast Lane
Senior full-stack developer in an 8-developer Agile team building enterprise web applications on C# and .NET. Designed RESTful APIs and backend services following clean architecture and SOLID principles, delivered full-stack features with a .NET backend and a modern JavaScript frontend, led code reviews and contributed to engineering standards. Worked with stakeholders to turn business requirements into scalable technical solutions.
Siblings Software
Joined as a back-end engineer in a staff augmentation model, embedded within client teams to deliver high-quality software solutions. Built and maintained systems using .NET Core, C#, and SQL Server across multiple client projects simultaneously.
Hoteldo.com
Joined as Web Developer and Webmaster, later expanded into SEO consulting, and ultimately led the company’s systems development team. Grew from building and managing the web presence to architecting the backend platform that powers the tourism wholesale operation.
Practical thoughts on building software, working with clients, and staying ahead in tech.
A clinic's stock has dates, lots and sometimes temperature limits. What a good stock process records, how FEFO picking works, and why recalls are a search, not a scramble.
When stock lives in more than one place, a transfer is not an instant move. It leaves one location, spends time on the road, and arrives somewhere else. Your system has to model all three.
When the system only stores today's quantity, nobody can explain why it is wrong. A movement ledger records every change, so discrepancies become something you can investigate.
I’m based in Buenos Aires (UTC-3), which overlaps with US business hours, and I work async-friendly, so time zones are rarely a problem.
Short engagements like the Audit are fixed price, paid 50% upfront and 50% on delivery. Larger projects are agreed in a simple contract with clear milestones.
You do. All work and deliverables belong to the client.
I sign an NDA first, work with read-only access, and don’t keep a copy when the Audit ends.
Almost never. Most legacy systems can be modernized in phases while they keep running.
Have a project in mind or an aging system to assess? Send me a message and I’ll get back to you within 24 hours, or book a free 30-min call.
Location
Buenos Aires, Argentina (Remote Worldwide)
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