Matthias Isler - Fractional CTO (Principal Engineer / Technical Architect)

Q: Where is Matthias based?

Matthias is based in Zürich, Switzerland and can operate in on-site , hybrid , and remote work models.

Q: What languages does Matthias speak?

Matthias speaks the following languages: German (Native), English (Advanced), Spanish (Elementary), French (Elementary), Serbian (Elementary) .

Q: How many years of experience does Matthias have?

Matthias has at least 21 years of experience. During this time, Matthias has worked in at least 6 different roles and for 4 different companies . The average length of individual experience is 4 years and 6 months . Note that Matthias may not have shared all experience and actually has more experience.

Q: What is Matthias's latest experience?

Matthias's most recent position is Fractional CTO (Principal Engineer / Technical Architect) .

Q: What companies has Matthias worked for in recent years?

In recent years, Matthias has worked for AureaTauri and GetYourLawyer .

Q: Which industries is Matthias most experienced in?

Matthias is most experienced in industries like Information Technology , Advertising , and Professional Services . Matthias also has some experience in Banking and Finance .

Q: Which business areas is Matthias most experienced in?

Matthias is most experienced in business areas like Information Technology , Product Development , and Quality Assurance .

Q: Which industries has Matthias worked in recently?

Matthias has recently worked in industries like Information Technology , Professional Services , and Banking and Finance .

Q: Which business areas has Matthias worked in recently?

Matthias has recently worked in business areas like Information Technology , Product Development , and Quality Assurance .

Recommended expert

Zürich, Switzerland

Experience

Jun 2022 - Present

3 years 10 months

Fractional CTO (Principal Engineer / Technical Architect)

Designed large-scale systems and APIs serving thousands of concurrent users.
Refactored a 650k-LOC monolith and led full AWS migration for stable performance.
Introduced SLO-based observability, improving reliability and recovery flow.
Optimised cloud and databases, achieving significant cost and latency reduction.
Delivered LLM, RAG, and document-automation pipelines adopted in production.

Apr 2021 - May 2024

3 years 2 months

Founder & CTO (AI/ML Engineer / Lead Engineer)

AureaTauri

Implemented XGBoost and ensemble models with faster, more accurate inference.
Built real-time trading pipelines with automated feature engineering.
Created full ML stack with warehouse, experiments, and CI/CD automation.
Scaled distributed GPU training 10× faster across AWS and GCP.
Ensured stable live operations with >50M real-market trading turnover.

Mar 2017 - Dec 2024

7 years 10 months

Co-Founder & CTO (Principal Engineer / Lead Architect)

GetYourLawyer

Designed a secure multi-tenant architecture with strong isolation and failover.
Developed matching and workflow engines for high-volume legal case routing.
Built AI agents, reducing paralegal workload by 80–90% and speeding turnaround.
Established CI/CD, testing, and observability enabling >99.9% uptime.
Mentored engineers, shaped coding standards, and led technical audits.

Feb 2014 - Nov 2018

4 years 10 months

CTO (Lead Engineer / System Architect)

Staffcloud

Directed full rewrite to modular multi-tenant SaaS with predictable latency.
Delivered enterprise APIs and integrations for large-scale deployments.
Introduced CI/CD and testing automation, cutting releases from weeks to hours.
Set up and managed a nearshoring engineering hub in Romania.
Mentored engineers and raised engineering standards company-wide.

Mar 2012 - Feb 2014

2 years

Lead Developer

Rad-Termin.ch

Designed scalable backend and modular frontend for multi-country networks.
Built a PHP framework (Zend-inspired) standardising the product suite.
Optimised DB and caching layers for faster API and page response times.
Established coding standards and release processes adopted firm-wide.

Jan 2005 - Dec 2012

8 years

Software Engineer - Various

Created a custom CMS framework that accelerated agency delivery.
Delivered production systems using PHP, JavaScript, and SQL.
Sold first commercial app implementation in high school; start of professional career.

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Professional Services, Advertising, and Banking and Finance.

Information Technology

Professional Services

Advertising

Banking and Finance

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, and Quality Assurance.

Information Technology

Product Development

Quality Assurance

Summary

Senior engineer and architect with two decades of experience designing and scaling distributed systems, SaaS platforms, and AI/ML-driven architectures. Brings strong system design leadership and hands-on depth across Python/PHP/JS ecosystems, cloud infrastructure, and data-intensive workloads. Known for driving architectural clarity and raising engineering standards across teams.

Refactored a 650k-LOC monolith and led full cloud migration to a stable, scalable architecture.
Designed multi-tenant, high-throughput systems serving thousands of concurrent users.
Built LLM/RAG and automation pipelines adopted in production across several products.
Created ML trading infrastructure powering >50M live-market turnover.
Scaled distributed GPU training systems, achieving 10× faster experimentation cycles.
Delivered APIs, data models, and platform architecture used across multiple teams.
Led large-scale rewrites to modern microservice and event-driven architectures.
Raised engineering standards through design reviews, mentoring, and architectural guidance.

Skills

Architecture & Design

System Design
Software Architecture
Data Modelling
Distributed Systems
Microservices
Event-driven Architecture
Domain-driven Design (Ddd)
Multi-tenant Saas
Serverless
Cloud Architecture
High-availability
Api Design (Rest, Grpc, Graphql)
Scalability & Performance Engineering
Technical Debt Management
Large-scale Refactoring
Automation
Rfcs/adrs
Design Reviews
Code Reviews
Requirements Engineering

Technology Leadership & Collaboration

Technology Strategy
Architecture Governance
Okrs & Kpis
Project Management
Cost Optimization
Agile / Lean (Scrum, Kanban)
Interviewing & Hiring
Mentorship & Coaching
Cross-functional Collaboration
Async Communication

Ai & Machine Learning

Ai Integration
Applied Ml
Large Language Models (Llm)
Generative Ai
Retrieval-augmented Generation (Rag)
Multi-agent Systems
Llm Agents
Prompt Engineering
Langchain
Langgraph
Fine-tuning
Feature Engineering
Deep Learning (Pytorch, Tensorflow)
Xgboost
Scikit-learn
Mlops
Model Development, Evaluation & Monitoring

Cloud, Devops & Reliability

Cloud Transformation
Aws
Google Cloud Platform (Gcp)
Orchestration (K8s)
Containerisation
Infrastructure-as-code (Iac)
Serverless (Lambda, Cloud Functions)
Ci/cd
Vercel
Supabase
Nginx
N8n
Monitoring & Alerting
Observability
Apm
Opentelemetry
Site Reliability Engineering (Sre)
Performance Profiling

Data & Infrastructure

Relational Databases (Postgresql, Mysql)
Document Databases (Mongodb, Couchdb)
Key-value Stores (Redis, Dynamodb)
Graph Databases (Neo4j)
Vector Databases (Qdrant, Pinecone, Milvus)
Elasticsearch
Bigquery
Data Warehousing
Databricks
Apache Spark
Etl/elt
Airflow
Prefect
Streaming (Websockets)
Messaging & Queues (Rabbitmq, Sqs, Pub/sub)

Programming & Frameworks

Python
Php
Sql
Javascript
Typescript
Fastapi
Django
Laravel
Symfony
Node.js
Nestjs
React
Next.js
Vue.js

Security, Quality & Testing

Unit Testing
Integration Testing
E2e Testing
Test Automation
Secure Coding
Owasp
Authentication Management

Key Highlights

Managed 7-figure Budgets
Consulting, Management, And Entrepreneurial Experience
Deep Ai/ml Expertise

Languages

German

Native

English

Advanced

Spanish

Elementary

French

Elementary

Serbian

Elementary

Education

Oct 2007 - Jun 2011

SBW Neue Medien

Swiss Federal VET Diploma, Mediamatics Technician · Mediamatics Technician · Switzerland

Oct 2007 - Jun 2010

SBW

Swiss Federal Vocational Baccalaureate, Information & Communication · Information & Communication · Switzerland

University of Colorado Boulder

Master of Science, Artificial Intelligence · Artificial Intelligence · Boulder, United States

Statistics

Experience

Total positions 6

Experience in Information Technology 14 y

Avg length 4 y 10 m

Longest experience 7 y 11 m

Expertise

Recent roles Fractional CTO (Principal Engineer / Technical Architect), Founder & CTO (AI/ML Engineer / Lead Engineer), Co-Founder & CTO (Principal Engineer / Lead Architect)

Main industries Information Technology, Professional Services, Advertising

Main business areas Information Technology, Product Development, Quality Assurance

Qualifications

Highest degree Master

Profile

Created

November 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Matthias based?

Matthias is based in Zürich, Switzerland and can operate in on-site, hybrid, and remote work models.

What languages does Matthias speak?

Matthias speaks the following languages: German (Native), English (Advanced), Spanish (Elementary), French (Elementary), Serbian (Elementary).

How many years of experience does Matthias have?

Matthias has at least 21 years of experience. During this time, Matthias has worked in at least 6 different roles and for 4 different companies. The average length of individual experience is 4 years and 6 months. Note that Matthias may not have shared all experience and actually has more experience.

What roles would Matthias be best suited for?

Based on recent experience, Matthias would be well-suited for roles such as: Fractional CTO (Principal Engineer / Technical Architect), Founder & CTO (AI/ML Engineer / Lead Engineer), Co-Founder & CTO (Principal Engineer / Lead Architect).

What is Matthias's latest experience?

Matthias's most recent position is Fractional CTO (Principal Engineer / Technical Architect).

What companies has Matthias worked for in recent years?

In recent years, Matthias has worked for AureaTauri and GetYourLawyer.

Which industries is Matthias most experienced in?

Matthias is most experienced in industries like Information Technology, Advertising, and Professional Services. Matthias also has some experience in Banking and Finance.

Which business areas is Matthias most experienced in?

Matthias is most experienced in business areas like Information Technology, Product Development, and Quality Assurance.

Which industries has Matthias worked in recently?

Matthias has recently worked in industries like Information Technology, Professional Services, and Banking and Finance.

Which business areas has Matthias worked in recently?

Matthias has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.

What is Matthias's education?

Matthias holds a Master in Artificial Intelligence from University of Colorado Boulder.

What is the availability of Matthias?

Matthias is immediately available full-time for suitable projects.

What is the rate of Matthias?

Matthias's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.