Josue K.-Software And Product Engineer
Check rate
Experience
Fractional CTO
UtuHealth
- Serve as hands-on fractional CTO, driving technical strategy and personally building on Kleia, UtuHealth's agentic orchestration platform that automates call handling, appointment booking, reminders, and follow-ups to reduce administrative burden on medical office assistants and providers.
- Built Taji, a Quality Improvement (QI) Copilot on Kleia, using a RAG pipeline over read-only OSCAR EMR data to ground condition registry logic in retrievable evidence, producing monthly QI charts with source-cited provenance for every flagged case.
- Lowered infrastructure costs by 60% by right-sizing capacity with autoscaling and shifting background workloads to spot instances.
Technologies: Go, Kleia platform, OSCAR EMR integration
Founder & Engineer
TrialAbuse
- Built a real-time fraud detection SaaS platform for free trial and bonus abuse, combining a 150+ signal detection engine (device fingerprinting, network intelligence, behavioral analysis, cross-operator consortium data) to deliver a single fraud verdict in 67ms median with 94% accuracy.
- Shipped self-serve pricing tiers with Stripe billing on GCP/Kubernetes, driving $8:1 ROI and ~$100K/month in recovered fraud losses for customers.
Technologies: Go, GCP, Kubernetes, Docker, Redis, PostgreSQL, Stripe, Device Fingerprinting, Behavioral Analytics
Golang AI Specialist & Competitive Problem Architect
Mercor
- Evaluated high-complexity Go code generated by LLMs, with focus on concurrency patterns, memory efficiency, and production-grade reliability under load.
- Designed and validated AI agent workflows for multi-step web browsing tasks, improving robustness and accuracy in real-world, high-variability scenarios.
- Engineered a feedback loop system that improved AI code generation reliability, reducing error rates in automated developer tooling.
- Authored algorithmic challenges (LeetCode/Codeforces-style) with comprehensive test suites and optimal reference solutions to stress-test AI code quality.
Founder
PropCopyAI
- Built a cloud-native Micro-SaaS on GCP/Kubernetes in Go + HTMX, integrating a multimodal LLM (Gemini) for real-time image-to-text property analysis, with S3-backed image storage and Stripe subscription billing.
Technologies: Go, HTMX, Gemini (Multimodal LLM), AWS S3, Docker, Kubernetes, Stripe, GCP
Senior Software Engineer
Rogers Sports & Media
- Designed and delivered a high-availability user data microservice in Go backed by Cassandra and Redis, improving data consistency and system uptime for millions of users.
- Built scalable sports data aggregation microservices using Go, Kafka, and PostgreSQL, capable of ingesting and processing real-time event streams at high throughput.
- Architected distributed microservices with redundancy and failover patterns, measurably increasing system uptime and performance under peak load.
- Led cross-functional collaborations translating business requirements into technical specifications; mentored junior engineers on distributed systems best practices.
Technologies: Go, Cassandra, Redis, Kafka, PostgreSQL, Docker, Kubernetes, Azure, AWS, REST & GraphQL APIs
Software Engineer
Sia Partners
- Built a robust REST API for an HR mentoring platform, improving mentor-mentee matching at scale.
- Implemented Redis caching to reduce database load and optimize search response times.
- Designed ETL pipelines for seamless, reliable data integration across systems.
- Engineered secure file storage for CVs and profile pictures using Google Cloud Storage.
Technologies: Python, FastAPI, Redis, Google Cloud Storage, Pandas, PostgreSQL
Software Engineer
Scaleway
- Scaled device polling infrastructure to handle 30,000+ devices using Celery and Redis, reducing error rates to under 1% — a critical reliability milestone for data center operations.
- Streamlined billing processes using distributed event-driven architecture, cutting processing time from 3 days to 1 day — a 66% reduction.
- Developed a Modbus RTU to TCP converter and a PUE calculator API in Go, improving data center energy efficiency monitoring.
Technologies: Python, Go, Django (DRF), Celery, Redis, RabbitMQ, Pandas, PostgreSQL
Software Engineer
Entr’ouvert
- Developed a reverse proxy authentication solution using Nginx for Single Sign-On (SSO) via SAML, handling authentication at scale across multiple services.
- Built a REST key-value storage microservice with ACL support and Role-Based Access Control (RBAC), improving data security and multi-tenant isolation.
- Integrated OIDC/OAuth2 for modern, standards-based authentication flows.
Technologies: Python, Django, Nginx, SAML, OIDC/OAuth2, RabbitMQ, Microservices
Software Engineer / DevOps Engineer
LOGAXONE (Euronext / Paris Mutuel Urbain)
- Built a Ruby tool for AIX partition management, reducing partition creation time by over an hour.
- Developed Puppet modules to standardize and accelerate testing and development environment configuration.
- Established CI/CD pipelines with GitLab, Jenkins, and Nexus, improving deployment reliability and automation.
- Designed a testing solution for trading platforms, including the Order Message Executor.
Technologies: Ruby, Puppet, GitLab, Jenkins, Nexus, AIX, CI/CD, Bash/Shell
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Media and Entertainment, Real Estate, and Banking and Finance.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Operations, Finance, Quality Assurance, and Research and Development.
Summary
Software and Product Engineer with a decade of experience building distributed systems and shipping products end-to-end, from architecture to customers. Deep technical expertise in Go, Kubernetes, and cloud-native infrastructure (GCP, AWS, Azure), paired with product ownership across fractional CTO and founder roles: setting technical strategy, scoping roadmaps, and working directly with customers to turn business problems into shipped software.
Skills
Distributed Systems & High Availability: Microservices Architecture, Kafka Event Streaming, Redis Caching, Cassandra, Multi-Region Cloud Deployments
Ai & Automation: Llm Integration, Agentic Workflows, Rag Pipelines
Product & Leadership: Technical Strategy, Roadmap Ownership, Customer-Facing Delivery, Cross-Functional Collaboration
Languages: Go, Python, Javascript, Ruby, Solidity
Databases: Postgresql, Cassandra, Redis
Ai/Ml: Langchain-Go, Gemini, Gemma3, Ollama, N8n, Llm Integration
Infrastructure: Kubernetes, Docker, Gcp, Aws, Azure, Ansible, Ci/Cd
Messaging: Kafka, Rabbitmq, Pub/Sub, Libp2p
Apis & Protocols: Rest, Graphql, Grpc, Saml, Oidc/Oauth2, Htmx
Languages
Education
SUPINFO
Bachelor's Degree in Information Technology · Information Technology · Paris, France
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Josue is based in Paris, France.
Josue speaks the following languages: French (Native), English (Advanced).
Josue has at least 10 years of experience. During this time, Josue has worked in at least 7 different roles and for 9 different companies. The average length of individual experience is 1 year and 2 months. Note that Josue may not have shared all experience and actually has more experience.
Based on recent experience, Josue would be well-suited for roles such as: Fractional CTO, Founder & Engineer, Golang AI Specialist & Competitive Problem Architect.
Josue's most recent position is Fractional CTO at UtuHealth.
In recent years, Josue has worked for UtuHealth, TrialAbuse, Mercor, PropCopyAI, and Rogers Sports & Media.
Josue is most experienced in industries like Information Technology, Media and Entertainment, and Banking and Finance. Josue also has some experience in Real Estate and Healthcare.
Josue is most experienced in business areas like Information Technology, Product Development, and Operations. Josue also has some experience in Finance, Quality Assurance, and Research and Development.
Josue has recently worked in industries like Information Technology, Media and Entertainment, and Real Estate.
Josue has recently worked in business areas like Information Technology, Operations, and Finance.
Josue holds a Bachelor in Information Technology from SUPINFO.
Josue is immediately available full-time for suitable projects.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 10 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
Similar freelancers
Discover other experts with similar qualifications and experience
Laurin H.
Antoine L.
Ornel Franck W.
Pierre B.
Frédéric K.
Serge K.
Sarah L.
Zakaria A.
Anton K.
Thomas H.
Experts recently working on similar projects
Freelancers with hands-on experience in comparable project as a Fractional CTO
Kéba F.
Fouad O.
Simona T.
Marc R.
Claire D.
Gabriel B.
Patrick R.
Tomas S.
Olivier D.
Mathieu D.
Nearby freelancers
Professionals working in or nearby Paris, France
Adel G.
Andon M.
François G.
Cenk A.
Manuel P.
Hansgerd M.
Karine A.
Sachie T.
Badr-Eddine E.
Rim Z.
