I applied through a recruiter. The process took 2 weeks. I interviewed at Bulb in Jun 2021
Interview
1. Phone screen with a light chat about career.
2. Tech test on an online platform.
3. Interview with principal engineer
4. Staff engineers interview with a pair programming challenge.
5. CTO interview talking about technical challenge.
Interview questions [1]
Question 1
Past technical challenges and a sketch of a system design.
I applied through an employee referral. The process took 3 weeks. I interviewed at Bulb in Jan 2021
Interview
Best interview process I've experienced. Transparent process, clear expectations, and exemplary feedback cycles. Would have trusted the evaluation process regardless of final result. Time with the CTO at the final stage was a nice touch.
4 stages. Each led by real Bulb engineers, not automated systems:
1) Code challenge. Conducted using the Geektastic platform. Write code and tests relating to a Bulb energy challenge. Language and framework of your choice.
2) System Design interview. Design a system architecture for a theoretical new Bulb energy feature. No code. Technical, organisational, and business context.
3) Competency interview. How you've built and delivered products in the past. Operations and personal impact.
4) CTO interview. Opportunity for both parties to assess alignment of values and cultural principles.
Interview questions [1]
Question 1
1) Code Challenge. Understanding business needs and producing code to match. Evaluating technical competency and unit tests.
2) System Design. Requires good understanding of architectural context, functional and non-functional requirements. Considerations based on customer needs and business scope.
3) Competency interview. Questions about how we like to operate, contributions to successes, and learnings from failures. How we've applied skills and values in practical situations.
4) CTO interview. Values and how we'd fit in with the team and Bulb's wider strategy. The big questions like "Why do you want to join Bulb?"
I applied online. The process took 2 weeks. I interviewed at Bulb (London, England) in Dec 2018
Interview
Phone screening followed by an at home technical test taking around 2 hours. Followed by two onsite interviews; one technical, one less formal.
Very much team member lead, a two way conversation, meeting a variety of developers at different levels.
