
Francisco Durán
@franciscodurn
Machine Learning Engineer at SLNG who built a production speech-to-text API processing 249 hours of audio per day.
What I'm looking for
At SLNG, I designed, built, and owned a production batch speech-to-text API, processing 1,043 jobs and 249 hours of audio per day. I tuned GPU inference for Speechmatics workers and built language-aware routing with back-pressure and event-driven callbacks.
I contributed to a real-time STT/TTS gateway in Rust and built slng-bench to compare speech providers on accuracy and latency. My work also included a serverless results service and multi-region benchmark runs.
At M47 Labs, I analyzed and optimized AI pipeline performance for Apple’s personal voice assistant, Siri, and automated MLOps workflows. My research at Polytechnic University of Catalonia focused on green AI, ML serving architectures, and profiling language-model resource use; I’ve published work in the field.
Experience
Work history, roles, and key accomplishments
Founding ML Engineer
SLNG
Dec 2025 - Oct 2026 (10 months)
Designed, built, and owned a production batch speech-to-text API on AWS with GPU workers, processing over 1,000 jobs and 249 hours of audio daily. Tuned GPU inference and contributed to a real-time STT/TTS gateway in Rust.
Analyzed and optimized AI pipeline performance for Apple's personal voice assistant, automating MLOps workflows and developing integration tests. Designed evaluation pipelines using LLMs and AI agents.
Research Engineer
Polytechnic University of Catalonia (UPC)
Mar 2023 - Dec 2024 (1 year 9 months)
Conducted research on green AI-based software systems, focusing on ML serving architectures and resource utilization profiling. Identified architectural design decisions and deployed ML models in cloud and local environments.
Collaborated on code development and QA for Oracle's In-memory TimesTen Database, creating tests and debugging in Perl and Python. Supervised code branches and migrated scripts to Oracle Cloud Infrastructure.
Research Intern
Polytechnic University of Catalonia (UPC)
Jul 2021 - Nov 2021 (4 months)
Conducted research on testing methods for deep learning models in computer vision with a focus on green AI. Gathered information and developed empirical methods for the research project.
Software Engineering Intern
Omnitracs (Solera)
Jul 2020 - Jun 2021 (11 months)
Implemented data analysis and ML to streamline QA processes using Python, Excel, and Splunk. Created Tableau dashboards and automated internal processes through scripting.
IT Intern
National Autonomous University of Mexico (UNAM)
Jul 2019 - Jan 2021 (1 year 6 months)
Provided lectures on Linux, Python, ML, and MATLAB to PROTECO members and university students, each course lasting two weeks.
Education
Degrees, certifications, and relevant coursework
Polytechnic University of Catalonia (UPC)
Master's degree, Informatics Engineering
2023 - 2025
Activities and societies: Member of Software and Service Engineering Group (GESSI research group)
Master's degree in Informatics Engineering. Member of the Software and Service Engineering Group (GESSI research group).
National Autonomous University of Mexico (UNAM)
Bachelor's degree, Mechatronics Engineering
2016 - 2021
Activities and societies: Member of Technology and Computing Program (PROTECO)
Bachelor's degree in Mechatronics Engineering. Member of the Technology and Computing Program (PROTECO).
Tech stack
Software and tools used professionally
Splunk
Tableau
Google Cloud Platform
GitHub
Bitbucket
Kubernetes
Jenkins
NumPy
Pandas
PostgreSQL
Redis
Terraform
Jira
JavaScript
Python
Java
C#
Perl
C++
C
Rust
MATLAB
TensorFlow
PyTorch
scikit-learn
Amazon SQS
FastAPI
Transformers
Linux
macOS
Windows
Datadog
AWS Lambda
TypeScript
pytest
Git
Docker
SQL
Hugging Face
vLLM
Bash
Matplotlib
Power BI
AWS
Microsoft Office
Availability
Location
Authorized to work in
Salary expectations
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