Matthias Isler

Fractional CTO (Principal Engineer / Technical Architect)

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Zürich, Switzerland

Experience

Jun 2022 - Present
3 years 8 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.

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

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