Jonas Kello
Consultant Owner at Kello Consulting AB
Jönköping, Jönköping County, Sweden
Summary
🤩
Rockstar🎓
Top SchoolJonas Kello is a seasoned system architect, developer and entrepreneurial consultant with over 25 years in the IT industry and a dozen years of focused professional experience running his own firm in Jönköping. He co-founded and served as CTO of Divid AB, leading technical strategy, product development and business growth while shifting the company toward HVAC selection tools. Jonas excels at designing and implementing web-based full-stack systems, devops and team leadership, and he often pairs hands-on coding with high-level architecture and project delivery. His open-source contributions include tangible improvements to tools like tsconfig-paths and the widely used GraphQL Code Generator CLI, showing an attention to developer tooling, testing and release automation. Known for pragmatic problem solving and a comfort moving between code, infrastructure and client-facing roles, he brings entrepreneurial grit and long-term technical stewardship to complex projects.
12 years of coding experience
26 years of employment as a software developer
Jönköping UniversityTechnology, Technology at Erik Dahlbergsgymnasiet
Swedish, English
Stackoverflow
1,328reputation
240kreached
13answers
17questions
Github Skills (33)
javascript10
testing10
command-line-interface10
typescript10
wpgraphql10
code-generation10
wordpress-graphql10
typescript-types10
command-line10
graphql10
nodejs10
typescripts10
cli10
react9
prettify8
Programming languages (24)
Github contributions (5)
jonaskello/tsconfig-paths
Dec 2016 - Jan 2023
Load node modules according to tsconfig paths, in run-time or via API.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:2 reviews, 233 commits, 78 PRs in 6 years 1 month
Contributions summary:Jonas implemented core functionality related to resolving paths in a TypeScript project, including loading configurations and installing custom module load functions. They added an example, refactored existing code, and added comprehensive testing. They also created a publish script for version management and deployment, indicating a focus on build and release processes.
node-moduletsconfig-pathstypescripttsconfig
dotansimha/graphql-code-generator
Dec 2017 - Apr 2019
A tool for generating code based on a GraphQL schema and GraphQL operations (query/mutation/subscription), with flexible support for custom plugins.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:24 commits, 8 PRs, 66 comments in 1 year 3 months
Contributions summary:Jonas primarily contributed to the GraphQL Code Generator project by implementing and testing new features for the CLI tool. Their work included adding options like `--require` and the `export` functionality, which enables the use of different schema formats and preloading modules. They also addressed linting errors and formatted the project with Prettier. Furthermore, the user addressed a bug related to unknown fragments, improving the tool's usability and robustness.
graphqlgraphql-schematypescriptcode-generatorcodegen
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