Guru as Jiva Karaka & Shani as Karma Karaka
जीवकारकः जीवो जीवात्मा जीवस्थानम् । कर्मकारकः शनैश्चरः सर्वकर्मप्रवर्तकः ॥ १ ॥
In Bhrigu Nandi Nadi, Jupiter (Guru) is the primary Jiva Karaka (representing the living soul/self of the native), while Saturn (Shani) is the Karma Karaka (representing all professions, actions, and destiny).