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sreynosolabs

Sebastián Reynoso · Software engineer

I build the software your business runs on.

With AI, in days, not months.

From connecting airlines to the website that sells your trucks.

Fast and well built: automated tests and deployments with rollback.

Let's talk about your projectSee projects

01 · Enterprise scale

7+ years building production software

Insurance, banking and travel systems in production: .NET, APIs, distributed systems, Azure and React, from design to production support.

Feb 2026 – present · ConnectNinjas

AI Integration Engineer

At ConnectNinjas, travel companies hire us to connect their platforms with the providers they need. I design and build those connectors: to OUIGO, to Nezasa, or to Lleego, an aggregator that opens access to 30+ airlines, booking systems and providers such as Amadeus, Iberia, Air Europa, Lufthansa and Emirates. Their APIs are huge and different from each other: I translate them into a single model, with security and end-to-end testing.

Integrated providers

  • Lleego
  • OUIGO
  • Nezasa

Through Lleego: Amadeus · Sabre · Travelport · Iberia · Air Europa · British Airways · Lufthansa · Emirates · Qatar Airways · LATAM · KLM · Air France · Turkish Airlines · Vueling and others (30+ in total).

  • C#/.NET connectors that translate each provider's transportation APIs into the platform's canonical model.
  • Strategies for complex constraints: multi-request aggregation, pricing reconciliation and resilient handling of inconsistent API contracts.
  • Transaction-auditing tooling with credential masking, plus automated certification flows.
  • AI-assisted work inside a workflow with planning, human review and real test output at every phase.

  1. Feb 2024 – present

    WTW · Software Engineer

    • .NET and React features for complex insurance systems, from implementation to production validation.
    • Azure B2C registration improvements that raised data consistency across connected systems by 35%.
    • React refactoring and coding standards that cut new-developer onboarding time by 60%.
    • AI-assisted development workflows with review before implementation, cutting feature delivery time by about 50%.

  2. Nov 2024 – Apr 2026

    Scale AI · Software Engineer for AI Training Data

    • Evaluated and improved AI-generated code in Python, C# and JavaScript for correctness, efficiency and maintainability.
    • Critical review of generated solutions, with clear technical feedback instead of treating them as production-ready.

  3. Jun 2022 – Feb 2024

    Globant · .NET Developer Semi Senior

    • .NET microservices, REST APIs and integrations for banking, financial and enterprise clients such as Supervielle Bank, Primax and California Coast Credit Union.
    • Asynchronous, event-driven workflows with RabbitMQ, Azure Service Bus and Azure Redis Cache.
    • Production troubleshooting with Kibana and Azure API Management policies.

  4. Sep 2021 – Jun 2022

    Scharff · Software Engineer

    • Led new projects, proposed the architecture and built the company's new web application from scratch in Vue.
    • CI/CD with GitLab and engineering standards: semantic commits, Git Flow and Git hooks.

  5. Jun 2021 – Sep 2021

    Inetum · DevOps Engineer

    • Monitoring with New Relic and PagerDuty, and Docker-based deployments for .NET applications.

  6. Feb 2020 – Apr 2021

    Bit Perfect Solutions · Software Engineer

    • Full-stack solutions with .NET, Vue.js and SQL, Visanet and Culqi payment integrations, and e-commerce.

02 · End-to-end products

Projects

Businesses that run today on software I built from idea to production.

01 · FAW and Sinotruk HOWO truck dealership

Taleon Motors

A website with catalog, quotes and its own admin panel, to sell trucks without depending on anyone.

View case study
⚠ Not securedealership-example.com

Catalog unavailable

This site may harm your computer

dealership-example.com

Before
taleonmotors.com homepage on desktopAfter
Before:
A template site, hacked, with the catalog down.
After:
Its own catalog, fast on mobile, with direct quotes.

02 · Invoicing, collections and KPIs for two companies

Proveedores y Soluciones Industriales

A desktop app that replaced a spreadsheet of thousands of rows and brought the numbers up to date.

View case study
fx =SUM(D2:D3650)
InvoiceCustomerDueStatus
2E001-0412—#REF!paid?
3E001-0413
4E001-0414—#VALUE!#N/A
5paid?
6E001-0416—#DIV/0!
7E001-0417#REF!
8—
invoices_receivable_FINAL_v3.xlsx
Before
Invoice list in the desktop app, with large text, filters at the top and a color label for each status: Not invoiced (gray), Pending (yellow), Paid (green), Overdue (red) and Voided (struck through). Fictional data.After
Before:
A huge spreadsheet with empty cells and broken KPIs.
After:
Invoices, collections and KPIs up to date, straight from the PDF.

03 · Tires, lubricants, batteries and service for fleets and government

Grupo IAP

A landing page with a 3D tire that shows everything the company does and turns visits into quotes.

View case study
company-example.com

503

Error 503

Service unavailable

Before
grupoiap.com.pe homepage on desktopAfter
Before:
A site that was down, template-like and invisible on Google.
After:
A 3D hero that shows the business and leads to a quote.

04 · In-house product · training app

Training Companion

A training app that works without signal and keeps your history ready for an AI to tune your routine.

View case study

Workout · Monday

  • Squat 3×8, 60 or 65?
  • Bench press, same as last time?
  • Shoulder pain (write it down)

60 × 8 · 60 × 8 · 55 × ?

??

Before
Today's session in Training Companion, dark theme, sample account: the Incline DB Press exercise with its target (3 × 8–12, RIR 1–2), the "Last time" box with the previous session's sets (26 × 11, 26 × 10 and 26 × 9) and its recent best set, today's set 1 already logged (26 kg × 12, RIR 1) and the set 2 editor with weight, reps and RIR.After
Before:
Scattered notes, with no progress or history.
After:
Every set logged and progress calculated automatically.

05 · In-house product · personal finance

FinanzasApp

Multi-currency personal finance, with installment debts and budgets that warn you before you overspend.

View case study

Where did the money go?

Installment 3 of 12?

45.90

Groceries

?

Payment in another currency

120.00

Monthly budget?

—

Before
FinanzasApp dashboard in dark theme with sample data: savings goal progress, two installment debts with progress bars, and three charts: spending by category (pie), income vs. expenses over the last six months (bars) and monthly trend for the year (area).After
Before:
Money going out unrecorded, in several currencies.
After:
Every expense, installment and budget in one place.

06 · Holistic therapies and Access Consciousness

Shelah Torreblanca

A website of her own that brings all her services together and turns every visit into a WhatsApp booking.

View case study

@holistic.therapy

Book via direct message

No website of its own

Before
shelahtorreblanca.com homepage on desktopAfter
Before:
Just a social media profile, with no website of her own.
After:
All her services in one place, with direct booking.

03 · Services

What I can build for you

System and API integrations

I connect your software with providers, platforms and AI assistants so data flows on its own, securely and without manual copying.

Backed by

AI automation

AI built in where it truly saves time: product sheets completed by pasting an assistant's answer, AI-generated routines you can import, and data ready for an assistant to query.

Backed by

Not on the list? If it's software, I build it.

04 · How I work

From the first conversation to working software

  1. 01

    Understand the business

    Before writing code, I learn how you work, what slows you down and what the software has to solve.

  2. 02

    Design

    I define the solution, the screens and the architecture, and we validate them together before building.

  3. 03

    Build

    I build with AI as a tool: I own the architecture, the security and the quality.

  4. 04

    Test

    Automated tests on what matters, so what works today keeps working tomorrow.

  5. 05

    Ship

    Deployments with rollback: if something fails, it goes back to the previous version.

  6. 06

    Train

    I show you how to use and manage it, so you don't depend on anyone for day-to-day changes.

  7. 07

    Support

    Post-launch support, to adjust whatever real use brings up.

Fixed price per project, never by the hour.

With all the material in hand, I deliver in days.

Fast and well built: automated tests, deployments with rollback and high Lighthouse scores.

7+

years of production software

  • — Insurance, banking and travel
  • — Spanish and English
  • — From idea to production

Sebastián Reynoso

I'm Sebastián Reynoso, a software engineer based in Peru. For 7+ years I've built production systems for insurance, banking and travel companies, and today I design the connectors that link a travel platform with airlines, rail operators and travel providers. Alongside that, I build custom software for businesses (websites, admin panels, internal apps and AI integrations) from idea to production. I like to understand how your business works before writing a single line of code, and I ship fast without cutting corners.

Let's talk about your project

Tell me what your business needs. I'll answer personally and we'll define the scope together.

Message me on WhatsApp

or write to hola@sreynosolabs.com