- You develop and extend Logos, our platform for complex legal and regulatory processes that has been running in production for over 20 years – in Common Lisp (SBCL), with a REPL-centric workflow and modern tooling (ASDF, SLIME/SLY)
- You own core logic, HTTP endpoints, and services, ensuring the platform remains maintainable, extensible, and future-proof
- You work with PostgreSQL on schema evolution, migrations, and query optimisation – using hu.dwim.perec and custom SQL tooling
- You maintain and evolve XML/XSLT pipelines (cxml, plexippus-xpath, libxslt) as well as document generation (cl-pdf, OOXML)
- You contribute to HTTP/web components (Hunchentoot), Auth/SSO, and mail integration
- You drive the platform's SaaS readiness: reproducible builds, containerised configuration, and observability (logging, metrics, tracing)
- You leverage AI-assisted development tools to safely analyse and evolve large Lisp codebases
- You actively contribute to engineering excellence: tests, CI, code reviews, and documented architectural decisions
Senior Lisp Developer (m/w/d)
Berlin, Remote - Deutschland
Full-time
Permanent employee
Your mission
Your profile
- Several years of hands-on experience with Common Lisp in production – you are confident with CLOS, macros, conditions/restarts, and a REPL-first workflow
- Solid PostgreSQL skills: schema design, indexing, tuning, and migrations are part of your day-to-day work
- Experience with XML/XSLT and common Lisp libraries (including alexandria, bordeaux-threads, cl-ppcre, drakma, cffi)
- You can modernise legacy systems incrementally without destroying proven, valuable foundations
- Nice to have: experience with hu.dwim.perec, Postmodern, or cl-dbi
- Nice to have: Python skills for integration with our Rulemapping Automation and AI service landscape
- Nice to have: Linux server operations, container workflows, Nix/NixOS
- You communicate clearly and concisely in English; German is a plus
Why us?
- You work on a technically demanding, production Lisp codebase with a real societal mission – not a greenfield toy project, but over 20 years of meaningful, accumulated substance
- You actively shape how an established platform becomes fit for the next decade
- Flexible working model: full-time with the option to work predominantly remotely – with a modern office in Berlin-Mitte for the days when being in the room matters
- A small, technically strong team with short decision-making cycles
- Innovative projects at the intersection of Legal Tech, AI, and regulatory automation
About us
Rulemapping Group GmbH, headquartered in Berlin, stands for innovation at the intersection of law and technology. Our mission is to simplify, accelerate, and make complex bureaucratic processes transparent and understandable for everyone. With our unique Rulemapping methodology and Rule AI, we develop solutions that relieve companies of bureaucratic burden, improve access to justice for individuals, and enable a rethinking of public administration. Supported by the Federal Agency for Disruptive Innovation (SPRIND), we are shaping the standard for the digitalization and automation of rule-based decision-making processes.
Rulemapping Solutions GmbH is the operational subsidiary of Rulemapping Group GmbH.
Together with you, we want to further advance this vision and revolutionize the world of rules and laws.