from dataclasses import dataclass
from datetime import date

@dataclass(frozen=True, slots=True)
class SoftwareEngineer:
  name: str = "Kirill Fedorov"
  role: str = "Software Engineer"
  since: int = 2020

  backend: tuple[str, ...] = ("Python", "FastAPI", "Flask", "Django", "PostgreSQL")
  frontend: tuple[str, ...] = ("JavaScript", "React", "Vue", "TypeScript")
  speaks: tuple[str, ...] = ("ru_RU", "en_US")

  @property
  def experience(self) -> int:
      return date.today().year - self.since

  def say_hi(self) -> str:
      return (
          f"Hi, I'm {self.name} — {self.experience} years of building backends. "
          "I also occasionally pretend to understand CSS."
      )

me = SoftwareEngineer()
print(me.say_hi())