Software Engineer & Technical Lead
Backend / Full stack / Automation
I build software, connect systems and take complex projects through to production. Hands-on, for more than ten years.
B2B via Kalo Software GmbH
Explore my workSelected work
Client projects and work from my time in product teams.
Client engagement · Kalo Software GmbH
Commissioned pilot to classify, extract and verify funding documents. AI-assisted processing combined with deterministic checks and visible source evidence for expert review.
Outcome: traceable verification results and manual handling of uncertain cases.
Employment · 2024–2026
Built a Python/FastAPI compute service in a Trusted Execution Environment, secure data workflows and SDKs, CLI tools and integrations for external developers.
Responsibility: backend engineering and Developer Experience Lead.
Employment · 2020–2022
Principal engineering responsibility for a Go-based operations platform spanning CRM, omnichannel communications and financial processes. Turned manual work into structured software.
Outcome: eliminated over 80% of recurring data redundancy in the import process.
Employment · 2024
Engineering within an ERP company’s growth team. Owned the web stack and cross-functional integrations, including an end-to-end customer referral system.
Delivery across frontend, backend and business-system boundaries.
Open source & independent tools
Open source · MIT
A local-first CLI that keeps the context of AI-assisted development in the repository: goals, decisions, verification evidence and what to do next. No cloud sync or LLM calls.
Free resource
Templates, examples and a generator for Architecture Decision Records. Capture technical decisions as Markdown, compare formats and keep the result alongside the code.
Working together
I help where technical depth and independent delivery need to come together.
Applications, APIs and integrations that work together. From data models and business logic to interfaces people can use.
Go · Python · TypeScript · ReactTurn documents and manual work into traceable processes. Combine AI, clear rules and human review where it matters.
Documents · Integrations · AutomationClarify architecture, modernize existing systems and take responsibility for delivery. Hands-on, alongside your team, through production.
Architecture · Modernization · DeliveryAbout me
I’m Brennan, a software engineer and founder of Kalo Software GmbH. I have spent over ten years building software in product organizations and demanding client environments.
My strength is connecting requirements to delivery: understanding the need, finding an appropriate technical solution and taking responsibility for the result. I work in English and German, remotely and internationally.
Career
English & German · fluent
Senior Software Engineer · Technical Consultant · Managing Director
B2B software engineering and document automation. Technical ownership from requirements and architecture through implementation and quality assurance.
Senior Software Engineer · Developer Experience Lead
Python/FastAPI compute within a Trusted Execution Environment, sensitive-document applications, SDKs and CLI tools.
Senior Software Engineer
Web and growth engineering, product initiatives and integrations spanning website, CRM and billing.
Co-founder · CTO · Software Engineer
Customer platforms, white-label integrations and bidirectional synchronization of external systems.
Principal Software Engineer
Technical responsibility for CRM, communications, KYC and financial workflows using Go/Gin, SQL Server and Vue.js.
Solution Engineer · Scrum Master · Team Lead
Enterprise document processing for insurers and reinsurers: extraction, validation rules, process integration, consulting and team coordination.
Research Assistant · Part-time
Distributed manufacturing demonstrators, interoperable message formats and web-based hardware control.
Education & research
Intelligent systems, software engineering and distributed / networked systems.
Publication
A Tesseract-based OCR framework for historical documents lacking ground-truth text2016 IEEE International Conference on Image Processing (ICIP)
Let’s talk
A new product, a difficult integration, or a process that takes too much manual work? Tell me a little about it.
A few sentences are enough to start. Please do not send confidential documents.
Contracting and invoicing via Kalo Software GmbH, Germany.