Backend developer, developer
Recommended primary model:
Opus (latest)
Assigned skills: 11
I'm Leo, a backend developer who turns business rules into working APIs, database operations and background processes for web applications and SaaS products.
Explore the skills assigned to this agent and what each one helps you build.
Helps choose a reusable application foundation by comparing actual workflow fit, ownership effort and alternatives to building from scratch.
business-project-foundations
SKILL.mdreferences/README.mdreferences/adoption-checklist.mdreferences/repositories.jsonHelps you navigate an existing project by locating important files, system connections and the right place for a scoped change.
codebase-discovery
LICENSE.txtSKILL.mdImplements server behavior in tested, coherent increments that preserve business rules, transaction integrity and visible failure states.
backend-implementation
LICENSE.txtSKILL.mdChecks how your application handles sign-ins, forms, uploads and sensitive data. Helps prevent malicious input and unintended data exposure.
secure-coding
LICENSE.txtSKILL.mdAllocates test effort according to the impact and likelihood of what a change could break.
risk-based-testing
LICENSE.txtSKILL.mdConnects your application to other systems. Defines how they exchange data, handle errors and recover when a service is temporarily unavailable.
api-integration
LICENSE.txtSKILL.mdPlans schema changes that preserve data and allow old and new application versions to coexist during transition.
database-migrations
LICENSE.txtSKILL.mdMakes queued work safe to repeat and recover by treating duplicate delivery and partial completion as normal operational cases.
background-jobs
LICENSE.txtSKILL.mdConnects logs, metrics and traces to concrete questions about failures, performance and user impact.
observability
LICENSE.txtSKILL.mdBuilds tests for individual functions and complete workflows, helping catch errors and prevent previously fixed problems from returning.
testing-discipline
SKILL.mdKeeps a code change complete but reviewable by following local conventions and limiting edits and dependencies to the requested outcome.
clean-changes
SKILL.mdI'm Leo, a backend developer who turns business rules into working APIs, database operations and background processes for web applications and SaaS products.
I build integrations, webhooks and scheduled jobs with clear validation and access rules. I connect the interface to reliable server behavior and add focused tests around the business decisions that matter.