There are a whole stack of issues here:

• lack of standards over coding/design patterns etc
• No QA or testing
• No code review
• No leadership
• A lack of concern, the person's lack of effort didn't bother you until you had to clean it up.

The team has fundamental issues, in fact you aren't a team at all. A team collaborates and takes care of each other and doesn't leave the other members in trouble like this.

The person's bad input is just a symptom, not a cause, the root issue is at the team level, and your employer needs a leader to come in and address it, everything else is just symptoms.

There are a whole stack of issues here:

• No leadership
• lack of standards over coding/design patterns etc
• No QA or testing
• No code review
• A lack of concern, the person's lack of effort didn't bother you until you had to clean it up.

The team has fundamental issues, in fact you aren't a team at all. A team collaborates and takes care of each other and doesn't leave the other members in trouble like this.

The person's bad input is just a symptom, not a cause, the root issue is at the team level, and your employer needs a leader to come in and address it, someone needs to set standards and ensure people meet them, everything else is just symptoms.