Mozaic.io is seeking a Senior SDK Developer to join their engineering team in Nashville or remotely within the US. As a key player in this fast-growing payments startup, you'll be responsible for designing and developing SDKs that enable seamless platform integration. The role combines technical expertise in multiple programming languages with SDK development, focusing on creating developer-friendly tools and maintaining robust documentation. You'll lead a small to mid-size team while working with cross-functional teams to align SDK features with product goals. The position requires strong experience in FinTech, particularly with major financial system APIs like Stripe, PayPal, Tipalti, or Dwolla. The company offers comprehensive benefits including fully covered health insurance, 401k matching, unlimited PTO, and professional development opportunities. This role is perfect for experienced developers passionate about creating scalable solutions in the creator economy payment space.