Mircea M.
Senior Software Engineer (Rails/React)
Experience
Nov 2024 - May 2025
7 monthsPoland
Senior Software Engineer (Rails/React)
Transcenda
- Built and optimized Rails 7 microservices and React features for patient management to support a platform with >10M study participants.
- Delivered compliant services on Docker and AWS ECS to speed deployments in a regulated environment.
- Implemented Unleash feature flags, Sumo Logic observability, and Canva design tokens to speed safe releases and keep the UI consistent.
- Developed a mobile-optimized UI with Web Components, Shadow DOM, and container queries to improve responsiveness across devices.
- Stack: Ruby on Rails 7, React, TypeScript, Docker, AWS ECS, Unleash, Sumo Logic, Artifactory.
Dec 2023 - Sep 2024
10 monthsHong Kong
Senior Software Engineer (Rails/React)
OnTheGoSystems
- Parallelized asynchronous jobs to cut translation processing time from tens of minutes to under 1 minute.
- Built and maintained product features in Rails, React, and Redux to expand the core platform.
- Hardened APIs with security best practices to reduce exposure to common vulnerabilities.
- Integrated OpenAI for rewrites and DeepL for machine translation to improve quality and reduce manual edits.
- Evaluated a fine-tuned RoBERTa NER model to validate entity extraction quality; ran parser conformance suites and shipped a glossary workflow.
- Stack: Ruby on Rails, React, Redux, Docker, AWS ECS, OpenAI API, DeepL.
Dec 2019 - Dec 2020
1 year 1 monthRomania
Full-Stack Software Engineer
CameraGuide
- Built and operated a recommendation engine end-to-end on AWS; added Amazon API import, ratings, and a selection wizard to improve catalog coverage and UX.
- Stack: Ruby on Rails, jQuery, Bootstrap, AWS.
Nov 2019 - Present
6 years 1 monthUnited States
Application Security Engineer & Pentester
Cobalt Inc
- Performed pentests and secure code reviews across Rails, Node.js, Python, and React and delivered remediation aligned with OWASP ASVS.
- Test authentication, access control, rate limiting, input validation, session management and data security using ZAP, Burp Suite, and Postman.
- Delivered security assessments and reports across authentication and SSO, access control and IDOR; data exposure and error handling; HTTP security headers and TLS; dependency risks; file and path handling and injection/unsafe reflection.
May 2013 - Sep 2018
5 years 5 monthsRomania
Full-Stack Software Engineer
Aissac SRL
- Built an accounts receivable automation platform (Rails and JavaScript) to deliver invoice insights for SMEs.
- Developed an ETL pipeline from historical invoicing data to generate reports used for lead generation, producing hundreds of prospects.
- Audited and fixed billing defects across invoicing applications and an online course platform (10k-50k users), strengthened tests, and upgraded stacks (Ruby 1.8 to 2.*, Rails 3.2 to 5) while adding OAuth 2.0, impersonation, and API access control.
- Stack: Ruby on Rails, Ember, Backbone, React, Stripe, OAuth 2.0.
Feb 2012 - May 2013
1 year 4 monthsRomania
C/C++ Software Engineer (CAD/FEA)
Fortech SRL
- Implemented features for complex CAD geometries and large finite element models to meet client requirements.
- Migrated Fortran components to C++ (STL, Qt, Boost) to modernize the graphics engine and enable plugin integration.
- Stack: C/C++, STL, Qt, Boost, CAD/FEA.
Summary
Hands-on problem solving and calm execution to your team from day one.
With over 10 years’ experience I have defined, shipped, tested and operated Web and Data products end to end.
I focus on APIs with clear ownership and SLOs, fast incident recovery and observability that makes issues obvious.
I partner with product, support and vendors to untangle cross-service problems, then turn incidents into better tests, alerts and docs.
Security stays simple and visible: gradual rollouts so teams move fast without surprises.
I scale architecture with sensible patterns such as modular monoliths and domain-driven design.
Languages
Romanian
NativeEnglish
AdvancedGerman
IntermediateHungarian
ElementaryEducation
Oct 2010 - Jun 2011
Vrije Universiteit
MSc · Computer Science · Amsterdam, Netherlands
Oct 2006 - Jun 2011
Petru Maior University
Engineer · Process Automation & Applied Computer Science · Târgu Mureș, Romania
Certifications & licenses
HIPAA Compliance Module
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