How Sophie Warwick turned her side hustle into a thriving full-time career

Sophie Warwick once balanced a demanding job as a structural engineer with a growing side business. Within a year, she turned that side hustle into her full-time career. Now, as co-CEO of Thoughtful Co., she helps others decide when to take the leap—or walk away.

Warwick began her consultancy while still employed in engineering. She set herself a strict deadline: if the business didn't meet her conditions within a year, she would return to her original role. To prepare, she mapped out cash flow goals, built an emergency fund, and established revenue targets for client growth.

As the side business expanded, the workload became overwhelming. She faced burnout and had to make a choice—commit fully to the consultancy or step back. Ultimately, she left engineering to focus on Thoughtful Co.

Her approach now guides others in similar positions. Warwick advises setting clear non-negotiables and visualising a balanced life before quitting a side hustle. Christen James Avery, a success coach for side hustlers, echoes this by urging people to recognise when a project has turned into an expensive hobby with no returns. James Avery also stresses the importance of giving oneself permission to walk away and acknowledging small achievements rather than fixating on setbacks.

Warwick's transition from engineer to full-time entrepreneur shows the value of planning and self-imposed deadlines. Her experience now informs her work at Thoughtful Co., where she helps clients assess whether their side businesses are sustainable. The advice from both Warwick and James Avery highlights practical steps for making such decisions—without regret.