Principal Developers at Thoughtworks can wear many hats. Depending on the client situation, you could be playing the role of a technical advisor to senior client executives, guide and direct solution architecture for large technical programs of work or drive technical implementation hand-on with our delivery teams.

Principal Developers also provide strategic and tactical leadership on accounts, establishing and maintaining trusted advisor status through high-impact client interactions. By empowering Thoughtworker engagement through cultivating high-performing teams, you will continuously deliver undeniable value to our clients, contributing to the growth and scale of our evolving business. Ultimately, the health of an account is a reflection of the capability and efficiency that you cultivate.

Job responsibilities

• You will champion and adopt best practices like writing clean and reusable code using TDD, pair programming and design patterns.
• You will exemplify Thoughtworks’ technical excellence, thought leadership and capabilities to our clients and inside Thoughtworks.
• You will act as a trusted technical advisor to your client by building key relationships and understanding the market and trends that could impact them.
• You can sense opportunities for improvement and are comfortable proposing and leading systemic change in organizations.
• You will assess client needs and develop the account strategy and proactive proposals needed to deliver value to our client.
• You can speak to the value of our delivery and how it maps to client vision, goals, and initiatives.
• You will continuously deliver undeniable value by ensuring the high performance of Thoughtworks teams on the account and proactively manage risk with the client.
• You will cultivate Thoughtworker growth and development by encouraging feedback and fostering an inclusive, supportive team culture.
• You will ensure security, privacy and legal compliance across the account.

Job qualifications

Technical Skills

• You have experience with .NET and/or Java.
• You have proficiency in other programming languages.
• You have a track record of managing the scope and shape of programs of work.
• You have experience with account management, third party contractual agreements, client management & pre-sales, client reporting and up-selling.
• You are comfortable chairing meetings, conducting reports, providing technical sales support and keeping budgets in check.
• You are comfortable helping delivery teams whenever is needed.
• You are knowledge of delivery approaches such as TDD, continuous integration, pairing and infrastructure automation.

Professional Skills

• You have a profound understanding of thecommercial airline industry.
• You have a natural ability to establish and nurture relationships with senior leaders across the organization.
• You have excellent context-switching capabilities.
• You thrive in situations where you are given little to no direction and have the ability to lead, organize and deliver commitments on time and within budget.
• You’re resilient in ambiguous situations and can adapt your role to approach challenges from multiple perspectives. You don’t shy away from risks, instead you take them on and skillfully manage them.
• You’re empathetic and use this ability to build solid working relationships and resolve issues quickly and thoughtfully.

Office Travel: Frequent on-site work is required for this position.

Other things to know

Learning & Development

There is no one-size-fits-all career path at Thoughtworks: however you want to develop your career is entirely up to you. But we also balance autonomy with the strength of our cultivation culture. This means your career is supported by interactive tools, numerous development programs and teammates who want to help you grow. We see value in helping each other be our best and that extends to empowering our employees in their career journeys.

Country: UK
City: London
Date Posted: 08-13-2025
Industry: Information Technology
Employment Type: Regular

About Thoughtworks

Thoughtworks is a dynamic and inclusive community of bright and supportive colleagues who are revolutionizing tech. As a leading technology consultancy, we’re pushing boundaries through our purposeful and impactful work. For 30+ years, we’ve delivered extraordinary impact together with our clients by helping them solve complex business problems with technology as the differentiator. Bring your brilliant expertise and commitment for continuous learning to Thoughtworks. Together, let’s be extraordinary.

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