AVAILABLE FOR HIGH-IMPACT WORK / 2026

Engineering for products
that matter.

I'm Sasha Ejarque, a fullstack engineer based in Argentina, with 5+ years turning ambiguous problems into products that actually ship. I care as much about clean architecture as I do about the person using what I build — that's the line I try to hold on every project.

Outside of code I train karate and grow bonsai — both taught me that precision is built one small, repeated correction at a time, not in one big leap. I bring that same patience to systems design.

LOCATIONArgentina
EXPERIENCE5+ years building software
LANGUAGESSpanish (native) · English (B1, working toward B2)
OUTSIDE OF CODEKarate · Bonsai · Music
View my work GitHub
SCROLL TO INSPECT

01 / FEATURED PROJECTS

PRODUCT SYSTEMS — 2024—26
B2B DIGITAL PRODUCT

Deep Gym.

My flagship project: a connected web and mobile experience that turns routines, members, and operations into one clear, scalable system.

View web app Google Play App Store
DEEP GYM / SYSTEM MAP LIVE
SYNC
MEMBERSROUTINESOPS
ROLEProduct architect / fullstack
CORE HIGHLIGHTSMulti-tenant · Cross-platform sync · Real-time routines
STACK
ReactReact NativeTypeScriptNext.js / Node.jsCloud DB
AWS EVENT-DRIVEN SYSTEM

Nexo.

Bank transfer system built on a real event-driven architecture on AWS — Cognito, SNS+SQS, an async Worker, and an append-only ledger in DynamoDB. The interface is simple on purpose: what matters runs underneath, with every cost decision verified before it was made.

View live demo GitHub
NEXO / SYSTEM MAP LIVE
FrontendAPI GatewayCore API · DynamoDBSNS/SQS · WorkerMock COELSALedger · PDF · S3
ROLESystem architect / fullstack
CORE HIGHLIGHTSEvent-driven architecture · Append-only ledger · Verified $0 cost
STACK
AWS LambdaDynamoDBSNS / SQSCognitoNext.js
AI RACE ENGINEER

F1 Race Engineer.

An AI-powered Formula 1 race engineer: takes real telemetry from OpenF1 and returns a validated, structured strategic analysis, not free text. Built in Python with FastAPI — with a real round of production incident diagnosis and fixes (rate limits, timeouts, token quotas) documented end to end.

View live demo GitHub
F1 ENGINEER / SYSTEM MAP LIVE
Dashboard · Next.jsf1-data-bc · OpenF1f1-ia-engineer · PydanticGroq LLM · JSON mode
ROLESystem architect / Python + AI
CORE HIGHLIGHTSPydantic-validated LLM output · Retry with backoff · Real production incidents resolved
STACK
PythonFastAPIGroqPydanticNext.js

02 / STACK & CAPABILITIES

TOOLS ARE A MEANS

Frontend & Mobile

ReactNext.jsReact NativeTypeScriptTailwind CSS

Backend & Architecture

Node.jsNestJSBFF PatternMicro-frontendsREST APIs

Databases & Cloud

AWSMongoDBPostgreSQL / SQLFirebase

Security & Delivery

OAuth 2.0 / JWTDockerCI/CDApp Store & Google Play

Agentic AI & Delivery

AI workflowsHuman supervisionProduct architecturePredictable delivery

03 / SYSTEMS & ANALYSIS

STRUCTURAL BLUEPRINTS

Look beneath
the interface.

Before writing code, I seek to understand the problem. These studies show how I think about operations, constraints, and opportunities for improvement.

Academic requirements-engineering case study on YPF Agro's delivery logistics. We traced how route planning ran on WhatsApp threads and a whiteboard, with no order traceability and no way to balance workload across drivers — a real risk for a business bound to a 48-hour delivery promise during seasonal demand spikes. We specified a web and mobile platform that automates route planning while still letting the logistics manager review and override it, gives drivers real-time delivery reporting, and leaves a historical record the business can use for demand planning.

Requirements engineeringRoute optimizationDelivery tracking
View full report (PDF)

04 / THE CRAFT

HOW I WORK
A

Patience & iteration

Bonsai and Karate teach the same thing software does: precision compounds.

B

Rhythm & composition

Harmony in UI, audio timing, and fluid UX.

C

System thinking

Clean Architecture and Domain-Driven Design.

D

Real-time status

Open for high-impact software engineering roles.

AVAILABLE NOW

05 / LET'S TALK

Looking for someone
who thinks and builds?

I’m open to opportunities where I can bring product judgment, technical depth, and a clear way of working with a team.