Desarrollador backend Python y Django, freelance, en Barcelona. Primero código que aguanta, después agentes IA. FastAPI, Flask y Go, y luego Pydantic AI y servidores MCP.

class ContactRequestSerializer(serializers.Serializer):
    email = serializers.EmailField()
    mission = serializers.ChoiceField(choices=Mission.choices)
    message = serializers.CharField(min_length=10)


def test_rejects_a_short_message(api_client):
    response = api_client.post("/api/contact/", {"message": "too short"})
    assert response.status_code == 400

class ContactRequest(BaseModel):
    email: EmailStr
    mission: Mission
    message: str = Field(min_length=10)


@app.post("/api/contact", status_code=202)
async def contact(request: ContactRequest, mailer: Mailer = Depends(get_mailer)):
    await mailer.send(request)
    return {"sent": True}

func (r ContactRequest) Validate() error {
	if _, err := mail.ParseAddress(r.Email); err != nil {
		return fmt.Errorf("email: %w", err)
	}
	if utf8.RuneCountInString(r.Message) < 10 {
		return errors.New("message: too short")
	}
	return nil
}