If you don't know who they are (and you should), they are the creators of flOw, Flower, and Journey.
I just read on thatgamecompany's Facebook that they're looking for a Systems Engineer, although there are more openings on the site, such as Art Engineer and Server Engineer:thatgamecompany Job Openings
From "Systems Engineer"
We are a small studio dedicated to crafting unique and high quality interactive experiences, and we are looking for someone to join our team to work with us on our custom engine and other lower-level systems. The goal in this role is to build a stable foundation that is highly-tuned for the level of stunning visuals and technical achievements that helped define our last game, Journey.
The new challenge with our next venture is for us to branch out and develop for multiple platforms after having created three games exclusively for a single platform. Ideally, we’re looking for talent that appreciates tackling the juicy low level problems inherent in developing a game with demanding technical performance requirements across multiple platforms.
This role requires a candidate who:
Is fluent in C++
Has a strong track record of programming, either on your own or as part of a small team
Has a keen and demonstrable interest in low-level programming and game engine optimization
Has a desire to contribute to the growth and maturation of the medium of video games
You will be more likely to enjoy this job if you:
Prefer the dynamics of a small studio environment
Have a mindset for prioritizing your own tasks based on the needs of the game
Have a desire to tackle complex challenges and come up with unconventional solutions
Aren’t secretly trying to be a game designer or gameplay engineer