[LANTR] Scalus: Multiplatform Tx Builder – same code for front&backend

[GENERAL] Name and surname of main applicant

Alexander Nemish

[GENERAL] Are you delivering this project as an individual or as an entity (whether formally incorporated or not)

Entity (Incorporated)

[GENERAL] Please specify how many months you expect your project to last (from 2-12 months)

3

[GENERAL] Please indicate if your proposal has been auto-translated into English from another language

No

[GENERAL] Summarize your solution to the problem (200-character limit including spaces)

Scalus Multiplatform Tx Builder API will allow to construct transactions on both JVM and JavaScript platforms. Thus freeing developers from implementing the same logic twice.

[GENERAL] Does your project have any dependencies on other organizations, technical or otherwise?

No

[GENERAL] If YES, please describe what the dependency is and why you believe it is essential for your project’s delivery. If NO, please write “No dependencies.”

No dependencies.

[GENERAL] Will your project’s output/s be fully open source?

Yes

[GENERAL] Please provide here more information on the open source status of your project outputs

The project is fully open sourced under Apache 2 License

[METADATA] Horizons

Developer Tools

[SOLUTION] Please describe your proposed solution

Add to Scalus a Tx Builder API following best and familiar transaction building practices in MeshJS, Lucid and Cardano Client Lib.

Use MeshJs and Cardano Client Lib as the implementations for JavaScript and JVM platforms respectively.

This API will allow to reuse transaction building logic on both JVM and JavaScript platforms. Thus freeing developers from implementing the same logic twice.

[IMPACT] Please define the positive impact your project will have on the wider Cardano community

This Scalus Tx Builder API will save time and money by freeing developers from implementing the same transaction building logic twice.

[CAPABILITY & FEASIBILITY] What is your capability to deliver your project with high levels of trust and accountability? How do you intend to validate if your approach is feasible?

The main proposer, Alexander Nemish will be actively working on the proposal along with Ruslan Shevchenko rssh – another prominent Scala and blockchain engineer/architect.

I won several grants in Fund 11 for Scalus and we're making progress and deliver results.

[PROJECT MILESTONES] What are the key milestones you need to achieve in order to complete your project successfully?

Design and implement Scalua Tx Builder API

Implement JVM backend bindings to Cardano Client Lib.

Test the integration.

Implement JavaScript API bindings to MeshJS or Lucid Evolution

Test the integration.

Add documentation and examples.

Use the Tx Builder API in Scalus Starter project.

Produce final report.

[RESOURCES] Who is in the project team and what are their roles?

The main proposer, Alexander Nemish will be actively working on the proposal along with Ruslan Shevchenko rssh – another prominent Scala and blockchain engineer/architect.

I’m a former compiler engineer at IOG, I worked on Marlowe DSL (https://marlowe.iohk.io).

I'm the author of Scalus - DApps Development Platform for Cardano.

I won several grants in Fund 11.

I’m a senior Scala engineer with more than 10 years of Scala development experience with companies like UBS and Deutsche Bank.

[BUDGET & COSTS] Please provide a cost breakdown of the proposed work and resources

We estimated 2.5 months of development.

2.5*160h* 75/0.3=100,000 ADA.

[VALUE FOR MONEY] How does the cost of the project represent value for money for the Cardano ecosystem?

Scalus Tx Builder API will save many hours of reimplementing the same transaction building logic on backend and frontend for those who use JVM for backend, the most used platform for backend on the planet.