DIEGO JULIΓO
SHOWCASING WORLD-CLASS SOFTWARE ENGINEERING
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HArd Skills
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Python
NestJS
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Amazon Web Services
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Typescript
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Javascript
Nodejs
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ReactJS
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Angular
Full TIme Software Engineer
Part-TIme THRILL SEEKER
Underwater Hockey π
Underwater Rugby π
Underwater Contact Team Sports
Certified scuba and freediverΒ
-
Ownership
-
Transparency
-
Excellence
My Core Values
Market Enabler
AG FINANCE
World-Class Projects
Contract Generator for a Marketplace
CMA
Framework migration
VALID8 MIGRATION
Ag Finance
Market Enabler
- π§π· Operates in Brazil
- π€ Allow Farmers to access money
- πΎ Acts as gateway to sell company's biological products
Ag Finance
Loans and everything to support them
- Background checks
- Gathering documents
- Validating the grower's financial situation
- Contract generation
- Assing funds
Ag Finance
Who is involved?
- Credit AnalystsΒ (internal & 3rd party)
- Collateral Analysts
- Field Referencing Analysts (3rd party)
- Sales Representatives
- Grower/Borrower
- Grower/Borrower Spouse
- Guarantor
- etc...
Ag Finance
𧩠Extensive workflow π
Ag Finance
Why world-class?
- π€ Top revenue project
- π‘οΈ Highly stable
- β‘ High efficient team
- π¬ Customer-centric focus
- π Growth x 8
What would I change?
- Leans more towards composition instead of inheratance
Ag Finance
Indigo's Architecture
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AgFinance Architecture
Ag Finance
1. Initial Improvements
πΌ
We received a small project
π π
Two weeks adaptation period
Ag Finance
1. Initial Improvements
- Migrate Squalize to TypeORM
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Improve Dx
- Dependency Injection (DI)
- βDecorators
Ag Finance
1. Initial Improvements
Migrate Squalize to TypeORM
- TypeScript Support
- Decorator-based Configuration
- Migration Generation
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@Entity('AgFinancingMatricula')
export class AgFinancingMatriculaModel extends BaseEntity {
@PrimaryGeneratedColumn('uuid')
id: string;
@ManyToOne((type) => Phase2Model, (phase2) => phase2.matriculas, { nullable: true })
phase2?: AgFinancingMatriculaModel;
@OneToOne((type) => AgFinancingFileModel, (file) => file.id, { nullable: true })
@JoinColumn()
matricula?: AgFinancingFileModel;
@OneToOne((type) => AgFinancingFileModel, (file) => file.id, { nullable: true })
@JoinColumn()
kml?: AgFinancingFileModel;
@OneToMany((type) => AgFinancingMatriculaDetailModel, (detail) => detail.parent)
@JoinColumn()
details: AgFinancingMatriculaDetailModel[];
@OneToMany((type) => AgFinancingFileModel, (file) => file.matricula)
@JoinColumn()
fieldMonitoringFiles: AgFinancingFileModel[];
@Column({ default: false })
includedInAnalysis: boolean;
@Column({ default: false })
includedInFormalization: boolean;
}
Ag Finance
1. Initial Improvements
Improve Dx
Dependency Injection (DI)
- Decoupling of Components
- Promote SOLID Principles
- Support for Advanced Scenarios
- Improve Code Quality
- Flexibility and Reusability
@Injectable()
export default class AgFinancingMatriculaService {
@Inject()
private readonly agFinancingMatriculaDal: AgFinancingMatriculaDal;
@Inject()
private readonly agFinancingDal: AgFinancingDal;
@Inject()
private readonly phase2Dal: Phase2Dal;
@Inject()
private readonly matriculaDetailDal: AgFinancingMatriculaDetailDal;
@Inject()
private readonly agStateService: AgStateService;
@Inject()
private readonly creditApprovalService: CreditApprovalService;
}
Ag Finance
1. Initial Improvements
Improve Dx
GraphQL Decorators
- Separation of Concerns
- Declarative Syntax
- Reusability
- Enhanced Modularity
@Resolver()
export default class GrowerLeadResolver {
@Inject()
private readonly growerService: GrowerService;
@Query()
@Auth({ scope: Scope.BR, permissions: [PermissionNames.FA_INTERNAL, PermissionNames.FA_EXTERNAL] })
async financingBrazilGrowerLead(parent: object, args: { leadId: string }, context: Context) {
return this.growerService.findById(+args.leadId);
}
@ResolveField({ typeName: 'FinancingBrazilGrowerLead', fieldName: 'additionalInfo' })
async lead(grower: GrowerLeadDTO, args: object, context: Context) {
return this.growerService.getAdditionalInfo(grower, !!grower.salesforceId);
}
@ResolveField({ typeName: 'FinancingBrazilGrowerLead', fieldName: 'agFinancingProcesses' })
async agFinancingProcesses(grower: GrowerLeadDTO, args: object, context: Context) {
return this.growerService.getAgFinancingProcessesByGrower(+grower.id);
}
@Mutation()
@Auth({ scope: Scope.BR, permissions: [PermissionNames.FA_ADMIN] })
async createFinancingBrazilGrowerLead(
parent: object,
args: { data: FinancingBrazilGrowerLeadCreateInput },
context: Context
) {
return this.growerService.createLead(args.data);
}
}
Ag Finance
2. Complex DB migrations
βοΈ ποΈ Β π§ π§
Due to the project's high complexity, often, we required complex DB migrations
Ag Finance
2. Complex DB migrations
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Planning, being thoughtful
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Development
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Staging Environment Testing
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Execution
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Monitoring and Verification
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Cleanup and Optimization
Ag Finance
2. Complex DB migrations
export default const mainScript: fnToExecuteType = async (dm: typeof DIManager, dbConnection: Connection): Promise<void> => {
log.info('------- START -------');
const currentStateDal = dm.get(AgCurrentStateDal);
const agEventDal = dm.get(AgFinancingEventDal);
const agStateDal = dm.get(AgStateDal);
const agStateService = dm.get(AgStateService);
const stateList = await currentStateDal.find({
relations: ['agFinancing', 'agState'],
where: {
agState: { stateId: In([AgStateName.P3_PHYSICAL_DOCS_RECEIVED, AgStateName.P3_AWAITING_PHYSICAL_DOCS]) },
},
});
for (const state of stateList) {
await agStateService.insertAndClearStateChange(state.agFinancing.id, AgStateName.AWAITING_CONTRACT_VALIDATION);
}
const events = await agEventDal.find({
agState: {
stateId: In([
AgStateName.P3_COMPLETE,
AgStateName.P3_PHYSICAL_DOCS_RECEIVED,
AgStateName.P3_AWAITING_PHYSICAL_DOCS,
]),
},
});
for (const event of events) {
await agEventDal.save(agEventDal.create({ id: event.id, agState: null }));
}
await agStateDal.delete({
stateId: In([
AgStateName.P3_COMPLETE,
AgStateName.P3_PHYSICAL_DOCS_RECEIVED,
AgStateName.P3_AWAITING_PHYSICAL_DOCS,
]),
});
log.info('------- DONE --------');
};
Ag Finance
2. Complex DB migrations
π π π
We run over 20 complex migrations successfully
Ag Finance
3. Scheduler
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We required to have updates from Salesforce
- Limited resources
- Bad timing on implementation
- Deadlines
Webhook is the best option, but:
Ag Finance
3. Scheduler
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Implemented solution:
Scheduler or Cron Jobs β°π
with DB lock
- Simplicity
- Independence
- Development speed to meet tight deadlines
Why?
Ag Finance
3. Scheduler
- Use Leader Election instead of DB lock
- Using an External Scheduling Service
- Optimize Salesforce queries
- Consider OOO hours
- Monitor API requests (Limits, Peaks, Warnings)
Today, What would I change?
Ag Finance
4. DevOps Leader
Go to person to perform DevOps task π¨βπ»β
- CI pipelines
- Linux servers
- Bash scripts
- Docker
- Networking
Ag Finance
4. DevOps Leader
Migration from dedicated RDS to OneDB
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Ag Finance
4. DevOps Leader
Terraform
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data "aws_caller_identity" "current" {}
locals {
name = "financing-api"
env = var.environment
description = "Infrastructure for financing-api"
bucket_name = "indigo-financing-api-${local.env}-us-east-1"
db_role = "financing_api"
tags = {
project = "financing-api"
team = "gefion"
environment = local.env
product = "AgFinancing"
repo-name = local.name
slack = "squad-gefion"
alerts = "@alerts-financing"
tier = "infra"
}
}
resource "aws_s3_bucket" "financing_api_bucket" {
bucket = local.bucket_name
acl = "private"
tags = merge(local.tags, {
"Name" = "Financing API Documents",
}
)
versioning {
enabled = true
}
cors_rule {
allowed_headers = ["*"]
allowed_methods = ["GET", "PUT"]
allowed_origins = var.main_bucket_allowed_domains
expose_headers = ["ETag"]
max_age_seconds = 3000
}
}
resource "aws_s3_bucket" "financing_api_bucket_brazil" {
bucket = "${local.bucket_name}-brazil-orders"
acl = "private"
tags = merge(local.tags, {
"Name" = "Financing API Documents for Brazil Orders",
}
)
versioning {
enabled = true
}
cors_rule {
allowed_headers = ["*"]
allowed_methods = ["GET", "PUT"]
allowed_origins = var.main_bucket_allowed_domains
expose_headers = ["ETag"]
max_age_seconds = 3000
}
}
module "yggdrasil_remote_state" {
source = "app.terraform.io/indigoag/lookup_indigo_terraform_remote_state/aws"
version = "1.0.0"
environment = local.env
state_name = "yggdrasil"
}
data "aws_iam_policy_document" "assume_role" {
statement {
actions = ["sts:AssumeRole"]
effect = "Allow"
principals {
type = "Service"
identifiers = ["ecs-tasks.amazonaws.com"]
}
}
}
data "aws_iam_policy_document" "rds_yggdrasil_iam_auth" {
statement {
sid = "rdsYggdrasilIamAuth"
effect = "Allow"
resources = [
"arn:aws:rds-db:us-east-1:${data.aws_caller_identity.current.account_id}:dbuser:${module.yggdrasil_remote_state.outputs.rds_cluster_resource_identifier}/${local.db_role}"
]
actions = ["rds-db:connect"]
}
statement {
sid = "rdsYggdrasilDescribeDBClusterEndpoints"
effect = "Allow"
resources = ["*"]
actions = ["rds:DescribeDBClusterEndpoints"]
}
}
module "service_scoped_secrets" {
source = "app.terraform.io/indigoag/service_scoped_secrets_app_policy/aws"
version = "1.0.0"
environment = var.environment
service_name = local.name
}
data "aws_cloudformation_stack" "sns_main" {
# this stack still lives in the infrastrucutre repository
# https://github.com/indigo-ag/infrastructure/blob/develop/cloudformation/sns/platform-events-stack.yml
name = "sns-main"
}
resource "aws_iam_role" "ecs_task_role" {
name = "${local.db_role}_task_role"
description = "Role to be utilized by ${local.name} containers run by ECS"
assume_role_policy = data.aws_iam_policy_document.assume_role.json
tags = local.tags
managed_policy_arns = [module.service_scoped_secrets.read_only_policy_arn]
inline_policy {
name = "rds_yggdrasil_iam_auth"
policy = data.aws_iam_policy_document.rds_yggdrasil_iam_auth.json
}
inline_policy {
name = "s3_policy"
policy = jsonencode({
Version = "2012-10-17"
Statement = [
{
Sid = ""
Action = ["s3:*"]
Effect = "Allow"
Resource = ["arn:aws:s3:::indigo-financing*", "arn:aws:s3:::indigo-financing*/*"
]
},
{
Sid = "1"
Action = ["s3:GetObject", "s3:List*"]
Effect = "Allow"
Resource = ["arn:aws:s3:::ag-finance-attachments-${local.env}", "arn:aws:s3:::ag-finance-attachments-${local.env}/*"
]
}
]
})
}
inline_policy {
name = "notify_schema_change"
policy = jsonencode({
Version = "2012-10-17"
Statement = [
{
Sid = ""
Action = ["cloudformation:DescribeStacks", "elasticloadbalancing:Describe*"]
Effect = "Allow"
Resource = ["*"]
}
]
})
}
inline_policy {
name = "sns_policy"
policy = jsonencode({
Version = "2012-10-17"
Statement = [
{
Sid = "SnsAccess"
Action = ["sns:Publish"]
Effect = "Allow"
Resource = [data.aws_cloudformation_stack.sns_main.outputs["SNSTopicARN"]]
}
]
})
}
}
# Load Balancer and associated resources for the api container
module "indigo_api" {
source = "app.terraform.io/indigoag/indigo_api/aws"
version = "1.0.0"
name = local.name
container_name = "api"
environment = local.env
product = local.tags.product
project = local.tags.project
repo_name = local.tags["repo-name"]
team = local.tags.team
health_check_interval = 16
health_check_timeout = 15
deregistration_delay = 60
publicly_accessible = var.publicly_accessible
}
COntract Management API
Contract Generator for a Marketplace
- π Generates contracts dynamically
- β Handles processing and reviewing
- ποΈ Supports both physical and digital signatures
Process Automation using BPMN
(Business Process Model and Notation)
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CMA
CMA
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CMA
Why world-class?
- πΒ New Stack, still performing as seniors
- π Impact, reduce manual effort, scale operations
- π―Β Leading Features
- πΒ Code Quality and Best Practices
What would I change?
More time for POC or Camunda expert
- Reduce the opportunity costΒ
- Documentation difficult to process
Be clear with the intention of camunda
CMA
Template Engine
Requirement
Use the web app to allow the manager to create the contract template
CMA
Template Engine
Challenges
- No clear scope
- Possible minimalistic programming language
- It required considerable training on the user side
- Not meeting the deadline
Use the web app to allow the manager to create the contract template
CMA
Template Engine
My solution walkthroughΒ
Use the web app to allow the manager to create the contract template
- Meet with the product manager to discuss the feature's context and North Star.
- Architect a solution to meet both deadlines and core demands.
- Discuss the technical approach with the engineering director.
1
Define contract type
- common template
- variables
2
Build template
- manual process
- set tags/placeholdersΒ
3
Develop Tag Resolvers
- Business rules
4
Create repository
- Match tag with resolver
My solution walkthroughΒ
CMA
Template Engine
My solution walkthroughΒ
Use the web app to allow the manager to create the contract template
print("Code time π»")
Benefits
-
Easy to reuse, functional
- Easy to: understand, implement, maintain, debug, and scale
-
Doesn't require any training
- Meeting the deadline
Downsides
- Managers are not fully independent
- Requires engineer team for new implementations
CMA
Template Engine
Use the web app to allow the manager to create the contract template
Improvements
- Manage versions of contracts for audit purposes
- Support rich text on tag resolvers
Valid8 Migration @ HeroDevs
AngularJS to Angular migration
- π Migration service
- π Large Financing web app
- π₯ Lead Engineer in a team of 4
V8 Migration
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Step-by-step migration
- User experience continuity
- Feature prioritization
- Continuous Delivery
- Time-to-market reduced
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Hybrid appβ
MORE THAN A SIMPLE RE-WRITE
V8 Migration
Legend:
Legacy
New
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HYBRID APP?
V8 MIGRATION
Why world-class?
- π Migration with Zero Downtime
- π§ Β High technical complexity
- π Seasonal Deadlines met
- π‘ Architectural Solutions
- π₯ Effective Team Leadership
What would I change?
- Create company standards
V8 Migration
Challange: Communicate both frameworks
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Let's imagine the following scenario
INNOVATIVE ARCHITECTURAL SOLUTIONS
V8 Migration
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INNOVATIVE ARCHITECTURAL SOLUTIONS
- Redux Pattern
- Single source of truth
- Standardize state management
V8 Migration
Facade Pattern
// Traditional Ngrx
this.store.dispatch(AccountsActions.deleteProjectAccount({ accountId }));
// Facade
projectFacade.deleteAccount(accountId);
INNOVATIVE ARCHITECTURAL SOLUTIONS
V8 Migration
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Bridge
INNOVATIVE ARCHITECTURAL SOLUTIONS
V8 Migration
Another Problem π«
Change Detection on both frameworks
INNOVATIVE ARCHITECTURAL SOLUTIONS
Solution
Create a wrapper to execute the required steps to comply with the change detection
V8 Migration
INNOVATIVE ARCHITECTURAL SOLUTIONS
Simply frameworks comunication
@decorators
V8 Migration
INNOVATIVE ARCHITECTURAL SOLUTIONS
var checksFacade =
bridge.store.getFacade('checks');
LEGACY
Get Facade
@FacadeLegacySupport({
registrationKey: 'checks'
})
@Injectable()
export class ChecksFacade {
}
New
Register Facade
Facade
V8 Migration
INNOVATIVE ARCHITECTURAL SOLUTIONS
@actionLegacySupport()
load() {
this.store.dispatch(ChecksActions.load());
}
New
Add Legacy Support
Action
LEGACY
Trigger Action
var checksFacade = bridge.store.getFacade('checks');
entitiesFacade.load_legacySupport();
V8 Migration
INNOVATIVE ARCHITECTURAL SOLUTIONS
@selectorLegacySupport()
checkList$ = this.store.pipe(
select(ChecksSelectors.getAllChecks)
);
New
Add Legacy Support
Selectors
LEGACY
Use Selector
var checksFacade = bridge.store.getFacade('checks');
checksFacade.checkList$_legacySupport
.subscribe(console.log)
@selectorLegacySupport({promisfy: true})
checkList$ = this.store.pipe(
select(ChecksSelectors.getAllChecks)
);
var checksFacade = bridge.store.getFacade('checks');
checksFacade.checkList$_legacySupport_promise
.then(console.log)
V8 Migration
- Streamline communication between frameworks
- Reduce complexity
- Enhanced productivity
- Minimizing migration and onboarding time
Benefits
INNOVATIVE ARCHITECTURAL SOLUTIONS
V8 Migration
MANAGER OF ONE
- Facilitated discussions on business needs
- Transform requirements into tasks
-
Regular meetings to manage scope, prioritization, and project status
-
Agile Methodology
-
Mentorship
-
π Top Performer Project
-
High Client Satisfaction
-
High efficient team
-
Driving substantial operational improvements
-
World-Class Projects
Market Enabler
AG FINANCE
Contract Generator for a Marketplace
CMA
Framework migration
VALID8 MIGRATION
Thank you
dianjuar@gmail.com
linkedin.com/in/dianjuar
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Minimal
By Diego Juliao
Minimal
- 31