Kayak Consulting LLC

Senior backend for product teams

[ C2C / B2B ]

You bring a problem. I look at it, lay out the alternatives, and build the one you pick. Main stack: Java and AWS. You contract Kayak Consulting LLC — the code belongs to your company. Not W-2, no visa sponsorship.

Federico Autalan

20+

years in production

10+

years with US / EU teams

C2C/B2B

via US LLC, not W-2

EST · CST · PST · EU

Overlap in your hours.

Experience with teams at

MercadoLibre
Rent The Runway
Siemens
Volkswagen
Telecom
Elementum
Coforge

NDA

Signed when you need it

Your code

The code is yours

Encrypted

Laptops, from day one

Direct

You talk to me

What I bring

Senior backend work across industries where concurrency, integrations, and reliability matter. Not a named client list.

The work

Java version upgrades and dependency conflict resolution. Move a running system forward — the JDK, Spring, and the libraries — without a long freeze.
Finding and fixing bottlenecks in hot paths — concurrency, data access, async pipelines, and load that shows up only in production.
Payment platforms and other external systems. Their APIs, webhooks, and failure modes stay at the edge — the core keeps one contract. Ship-monitoring hardware, plus warehouse scales and dimensioners. Device readings land in an API the rest of the platform can use. ERP/SAP bridges and legacy modernization without freezing the business.
Kafka and Kinesis when the work cannot be a request and a response. Streams, retries, and consumers that keep moving when something downstream is down.
Event-driven incident and notification platforms on AWS (SQS, SNS, SES, Lambda) for US / California product teams.
Portfolio demos — not client production systems. Agents, RAG, and classification with human-in-the-loop and rules outside the model. See live demos.
Comfortable under unclear requirements — narrow the question, ship a thin testable slice, then harden.
Research options, run spikes, and recommend what to adopt — then build whatever you decide. Trade-offs against your constraints, often with staff engineers and tech leads.

Industries

High-concurrency payment backends, multi-country rules, and zero-downtime release patterns on systems that run around the clock.
Product and catalog platforms — APIs as source of truth, inventory-aware flows, ML-assisted attributes to cut manual cataloging time.
Maintained the live system and added features across shipping orders, receiving orders, billing, warehouse, inventory, replenishment, and transportation, including integrations with the vendors those operations use.
Billing and BSS cores under peak cycles, large subscriber bases, and data pipelines that have to stay up. Also a system that detects faults in the network.

Core stack

Java Kotlin Spring Boot AWS Kafka Kinesis PostgreSQL MongoDB Python TypeScript / Angular Docker CI/CD

Portfolio

Selected Work & Live Demos

Hands-on examples of how I design backend systems, cloud architectures, and AI-assisted business workflows for enterprise teams. Short walkthroughs also live on Kayak Consulting LLC on LinkedIn.

Marketplace & eCommerce Scale

High-traffic Java services for global marketplaces: catalog, checkout flows, and inventory orchestration with strict latency and reliability targets.

Java Spring Boot Distributed Systems

AWS Event-Driven Platforms

Event-driven pipelines on Kinesis, SQS, and Lambda: decoupled services, retries, and tracing for production workloads.

AWS Kinesis SQS

Enterprise Integration

Backend work for automotive, telecom, and industrial clients: legacy integration, API gateways, and tuning on PostgreSQL-heavy stacks.

Kotlin PostgreSQL B2B APIs

Subscription & Fulfillment Logic

Inventory and fulfillment engines for fashion rental: availability, warehouse routing, and the SLAs customers actually see.

Inventory Workflows SLA Design

How we work

Fully remote from Buenos Aires, overlapping EST, CST, PST, and EU. Contracts and invoicing run through Kayak Consulting LLC, a US company, on C2C (via staffing) or B2B (direct). Standard engagement: W-8BEN-E, EIN, and formation docs from the LLC, plus invoicing — not a W-2 hire or visa sponsorship. Clients in California, wider US, Ireland, and Europe.

How it starts

01

Diagnose

I write down the problem, even if it is still vague.

02

Options

Paths, with tradeoffs.

03

You decide

You pick, with the tradeoffs in front of you.

04

I build it

The code stays with your company.

Engagement models

01

Monthly retainer

A set number of hours every week, part-time or full-time.

02

Hourly (T&M)

Flexible spikes, advisory, and work where scope shifts week to week.

03

Fixed milestones

Defined outcomes quoted up front. Written scope; changes go through a change order.

Security

NDA and IP. All work product (code, docs, architecture) is owned by the client through Kayak Consulting LLC, under NDA.

Data. Production access only when required, in isolated environments. Local copies on full-disk encryption / FileVault; purged when the engagement ends.

Secrets. Password manager for AWS tokens and credentials. Never stored in plain text.

Devices. I work from encrypted, up-to-date laptops.

Hours

Overlap in your hours — EST, CST, PST, and EU. Daily sync when the team wants it; same-day replies in the window we agree up front.

Ownership

I work on open problems and call out debt and risk early.

Commitment

Built for multi-month retainers. One primary engagement at a time. I confirm the start date and weekly hours before we start.

Payment

ACH / US domestic wire to Kayak Consulting LLC · Net 15. European clients pay in EUR — no international wire.

English for technical discussions and client meetings; Spanish native; Portuguese intermediate.

Demos and engineering notes: Kayak Consulting LLC on LinkedIn.

Recommendations

Former managers and teammates have left written recommendations on LinkedIn — names, roles, and context included.

Read recommendations on LinkedIn

A backend problem you have not fully defined?

US LLC · C2C / B2B · not W-2 · no visa sponsorship · monthly, hourly, or fixed.

Prefer LinkedIn? Connect with me or follow Kayak Consulting LLC.

Let's connect Federico Autalan Senior Software Engineer