Cathal Killeen

Senior Software Engineer @ Healthplus.ai, Amsterdam Jul 2026 – present

<1 s median responseSOUP gaps 39 → 1261 requirements triaged

• Own the backend of a clinical decision-support medical device (FastAPI, PostgreSQL, Azure), from design to regulated release under IEC 62304 (Medical device software – Software life cycle processes).
• Brought every results endpoint under a 1 s median response time by adding database indexes and caching JWT signing keys and Azure credentials.
• Put the regulatory requirements set under version control as code (Doorstop), triaged 261 requirements that had no traceability links, and built the validation reports and review tooling.
• Redesigned the release and verification and validation (V&V) process with the quality lead around docs-as-code and requirements-as-code, improving engineering workflow while keeping regulatory compliance and internal documentation standards intact.
• Led release documentation for a regulated release (release notes, V&V plan, label verification) and cut accepted SOUP (Software of Unknown Provenance) gaps from 39 to 1.
• Authored the next major version's 61-item data interface specification, containerised model deployment design and architecture evaluation criteria.
• Raised engineering standards: wrote a FastAPI style guide, added OpenTelemetry logging and tracing, simplified role-based access control and drafted a secrets-management plan.

Senior Software Engineer @ Agriplace (now Simvia), Amsterdam Jun 2024 – Jun 2026

CI 20 → 5 minfirst data lakehouseautomated DORA reports

• Set up the data engineering foundation on my own: the first data lakehouse on AWS, and a BI tool (Metabase) for internal insights.
• Led the architecture of a compliance and audit platform, designing for form versioning, semantic data structure and long-term analytics to head off scalability risks.
• Drove technical strategy by pushing back on excessive customisation, keeping the platform focused on scalability, speed and standardisation.
• Made the architectural calls when integrating two platforms: a single source of truth for key datasets, and ORM/DB relationships to prevent sync issues.
• Built a system that tracks deployments across all projects and repositories, producing automated DORA dashboards and monthly reports.
• Automated releases with a pipeline that aggregates GitHub, Jira, CircleCI and Sentry and uses generative AI to post concise release notes in Slack.
• Added Justfiles with common commands to every repository, as living documentation of engineering workflows and a faster onboarding.
• Built a content syncing pipeline with stable identifiers for master data, simplifying new staging environments and formalising the staging, QA and content release process.
• Cut the CI pipeline from 20 minutes to 5 through test suite optimisations, among other DevOps improvements across the team.

Software Engineer @ bloomon, Amsterdam Apr 2023 – May 2024

B Corp 2023event-sourced stock

• Owned technical solutions and system design across critical warehouse domains: supply chain logistics, production flow and real-time stock management.
• Built and deployed an end-to-end quality control system for fulfilment that inspects faults early, reducing late-stage errors and improving customer experience.
• Led data work for company governance, extending internal tooling and metadata stores to manage supplier certification data and historical reports, contributing to the B Corp certification in 2023.
• Designed and contributed to a high-availability, event-sourced stock monitoring system for perishable inventory, using Google Cloud Pub/Sub for real-time integration across teams.

Software Engineer @ Meta (Facebook), London Mar 2021 – Mar 2023

99.99% uptime76M+ hitstop CSAT 2022

• Defined and built a prioritisation framework that evaluated over 205 Meta developer products, so support functions could focus on the clients and products generating the most revenue.
• Led the migration of the search backend for bug search on developers.facebook.com, at 99.99% uptime and over 76 million hits to date.
• Domain expert for triaging complex support cases across key Meta APIs and SDKs, specialising in the Messaging APIs (Messenger, Instagram, WhatsApp).
• Scored the highest CSAT across the entire global support team in 2022.

Software Engineer @ Coalface Capital, Dublin May 2018 – Feb 2021

−50% cloud computefeed onboarding: days → minutes

• Led a cost-saving migration of the enterprise database from MS SQL Server to PostgreSQL, cutting monthly cloud compute bills by 50% by eliminating licence fees.
• Designed a scalable, event-based data architecture on Kafka that removed database query load and cut onboarding of new high-volume market data feeds from days to minutes.
• Automated the MLOps pipeline with periodic retraining and recalibration of models, enabling rapid deployment of new algo-trading strategies and backtesting on new instruments.
• Built a centralised monitoring, alerting and reporting system as a single source of truth for business processes and cloud infrastructure, reducing troubleshooting downtime for traders.

Software Engineer Intern @ Modular Automation, Shannon Summer 2017

adopted immediately

• Built a real-time data visualisation system on top of on-site SQL databases, giving engineers live metrics (temperature, speed) from manufacturing machinery for fault diagnosis.
• The dashboard was adopted immediately and sped up testing of new apparatus for contact lens curing (Johnson & Johnson Vision Care) and microchip manufacturing (Analog Devices).

BSc Computer Science @ University College Dublin 2014 – 2018

• Courses: Distributed Systems, Operating Systems, Performance Testing, Databases, Web Design, Software Engineering Projects I–III.
• Activities: hackathons and entrepreneurship events.
• Study abroad at the University of Colorado, Boulder: HackCU hackathon organiser, Boulder Freeride ski club.
• Final year project: a web directory of university elective modules, with universal search (information retrieval) and a collective-intelligence recommender.