James Quacinella

James Quacinella

Mentor
5.0
(82 reviews)
US$40.00
For every 15 mins
99
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First 15 mins free for your first session
ABOUT ME
Senior Infrastructure & Python Engineer · AI-Assisted Development
Senior Infrastructure & Python Engineer · AI-Assisted Development

Using AI coding agents without wrecking your codebase is where most people are struggling right now — that's my sharpest area. Behind it: 20+ years of production Python, Linux, and system design, two CTO roles, and a Master's in Data Analytics with a machine-learning focus. I currently build and run production infrastructure at a fintech.

I'm most useful to you on three things:

• AI-assisted development done right — getting real speed out of coding agents while keeping your codebase coherent, reviewable, and maintainable.

• Production Python & system design — architecture review, design-interview prep, "why is this slow / fragile / hard to change," and how a senior engineer actually reasons about a system.

• Linux, Docker & data infrastructure — real production ops, not toy examples. Debugging, deployment, storage, scaling.

I teach with a bias toward the durable stuff: model your data and your domain well, and most of the hard problems get easier. It's also why I keep a standing interest in semantic web standards — RDF, JSON-LD, SHACL, knowledge graphs — and why I'll push you to get the model right before you write the code. Patient, clear, and I'll make sure you actually understand the why, not just the fix.

A good first session — Agent-Readiness Architecture Review (60 min): bring a real repository and we'll find the architectural assumptions that exist only as tribal knowledge, the invariants worth making executable, and where agent-driven change is most likely to cause drift.

Eastern Time (US & Canada) (-04:00)
Joined March 2016
EXPERTISE
12 years experience | 32 endorsements
Primary language across my career, from data-science stacks to production services and automation. I help with everything from "make this...
Primary language across my career, from data-science stacks to production services and automation. I help with everything from "make this work" to "make this maintainable" - architecture, performance, testing, and reasoning about design tradeoffs like a senior engineer would.
20 years experience
Two CTO roles and 20+ years designing systems that have to stay up and stay changeable. Great for design-interview prep, architecture rev...
Two CTO roles and 20+ years designing systems that have to stay up and stay changeable. Great for design-interview prep, architecture reviews, and untangling systems that have become hard to work with.
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Ai agent
2 years experience
How to use coding agents and LLM tooling to actually go faster without drowning in unreviewable code. Spec-driven and model-first workflo...
How to use coding agents and LLM tooling to actually go faster without drowning in unreviewable code. Spec-driven and model-first workflows, and how to keep a codebase coherent, reviewable and maintainable as agents touch it.
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5 years experience | 1 endorsement
Master's in Data Analytics with a machine-learning focus, plus production ML across my career - including building credit risk models in ...
Master's in Data Analytics with a machine-learning focus, plus production ML across my career - including building credit risk models in fintech. Comfortable from the fundamentals - what a model is actually doing and why - through getting one deployed and keeping it useful. Good for coursework, career transitions, and sanity-checking an approach before you commit to it.
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20 years experience | 1 endorsement
My sole operating system since I was a teenager - 20 years - with most of that spent running production systems (Ubuntu, CentOS, RHEL, Fr...
My sole operating system since I was a teenager - 20 years - with most of that spent running production systems (Ubuntu, CentOS, RHEL, FreeBSD). Debugging, networking, services, storage and deployment - the works.
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6 years experience | 4 endorsements
Production Docker and Docker Compose for real services and deployments - multi-service stacks, networking, auth, TLS and registries. I ha...
Production Docker and Docker Compose for real services and deployments - multi-service stacks, networking, auth, TLS and registries. I have also used Docker in CI pipelines for automated testing and build workflows.
3 years experience
Running and scaling real Elasticsearch clusters in production - storage, indexing, performance tuning and cluster ops. Migrations and cap...
Running and scaling real Elasticsearch clusters in production - storage, indexing, performance tuning and cluster ops. Migrations and capacity work included, plus the wider ELK stack for logging and monitoring.
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REVIEWS FROM CLIENTS

5.0
(82 reviews)
Zachary Morin
Zachary Morin
August 2023
James was a tremendous help and extremely knowledgeable! He was patient with me and made sure I understood everything we did together. I would highly recommend James to anyone looking for some extra help.
Joe Foley
Joe Foley
March 2023
Truly truly super. Get James if you can
s c
s c
December 2016
Super helpful.
Amanda
Amanda
November 2016
I am so thankful for finding James . He helped me better understand my project and I now have a better understanding of python in general. James presented me with guidance and suggestions that opened my mind up to the possibilities for project and introduced me to new methods and code. Highly recommended, very clear and well spoken and easy to follow.
Chase Johnson
Chase Johnson
November 2016
Great mentor
Chase Johnson
Chase Johnson
October 2016
Great mentor.
Del Ventruella
Del Ventruella
October 2016
A great guy!
Del Ventruella
Del Ventruella
October 2016
A good guy.
Sam R.
Sam R.
October 2016
Great mentor, very helpful and patient and explains things well.
Miro
Miro
October 2016
Professional, efficient and highly communicative.
EMPLOYMENTS
Infrastructure Engineer
GLMX
2025-03-01-Present
Build and operate production infrastructure for a financial technology platform.
Build and operate production infrastructure for a financial technology platform.
Python
MySQL
Linux
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Python
MySQL
Linux
Ubuntu
Elasticsearch
Ansible
OWASP
Graylog
KVM Virtualization
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Founder & Principal Consultant
MetaCoding Solutions LLC
2022-11-01-2025-02-01
Founded and ran an independent consultancy building data-centric backend systems for clients. Work spanned semantic web technologies (RDF...
Founded and ran an independent consultancy building data-centric backend systems for clients. Work spanned semantic web technologies (RDF, knowledge graphs), graph databases, modern backend architecture, and automation / RPA - with a bias toward open-source and low-code tooling, and toward modelling the data and the domain properly before writing application code.
Linux
Neo4j
RDF
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Linux
Neo4j
RDF
Graph Database
Data modeling
RDF Linked Data
HTMX
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CTO
Aliya Financial Technologies
2017-02-01-2022-10-01
Migrated Aliya's older Data Science platform to a newer, scalable open-source platform, resulting in ~ 70% reduction of AWS costs for DS,...
Migrated Aliya's older Data Science platform to a newer, scalable open-source platform, resulting in ~ 70% reduction of AWS costs for DS, while improving cloud utilization and throughput of the DS team. Provided support to our CISO to maintain Aliya's security controls and pass our SOC-2 and 3rd-party security audits. Designed and deployed infrastructure to deploy, backup, and scale a secure production API wrapping our custom credit risk machine learning models to the cloud, with a 99.999% up-time SLA. Designed and implemented Aliya's Payroll Integration (aVerify) product from conception to productionization. Implemented various techniques, from Lambda functions to spot instances, to reduce Aliya's overall cloud footprint. Reduced our monthly spend across all accounts by ~50%.
Python
Machine Learning
Docker
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Python
Machine Learning
Docker
Kubernetes
AWS
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