Okay, let's see. I need to figure out the hourly rate for Jun Hao Glen Yeo based on his profile. Let's start by looking at his experience. He has two jobs listed. The first is as an Engineer at SUMITOMO BAKELITE CO., LTD. from November 2022 to September 2023, which is 11 months. Before that, he was an Assayer at Metalor Technologies SA from August 2020 to October 2022, which is about 2 years and 3 months. So total work experience is around 3 years and 2 months.

His education includes a Bachelor's in Chemistry from the National University of Singapore, which he finished in 2019, and he's currently pursuing a Master of Science in Applied Geosciences at the University of Pennsylvania, expected to finish in 2025. That's a bit confusing because it's 2023 now, so maybe he just started the master's program part-time or online while working? Not sure, but having an ongoing master's might add some value.

Location is Singapore, so I need to consider the average rates there. Engineers in Singapore might have different rates compared to assayers. Let me think about the roles. An Engineer in a company like Sumitomo Bakelite could be in manufacturing or chemical engineering. Assayer at Metalor might involve testing precious metals, quality control, which is a specialized role but perhaps more technical.

In Singapore, the average hourly rate for an engineer with around 3 years of experience. Let me check typical salaries. Maybe a mid-level engineer might earn around SGD 60,000 to SGD 80,000 annually. Converting that to hourly: assuming 2080 hours a year, that's about SGD 28.85 to SGD 38.46 per hour. But if he's a contract worker or freelancer, the rate would be higher to account for benefits, maybe 1.5 to 2 times the salaried rate. So maybe SGD 40 to SGD 70 per hour.

But wait, his current role as an Engineer is only 11 months, and before that, he was an Assayer. The Assayer role might be more lab-based. Maybe that's a slightly lower-paying role. So combining both roles, maybe his experience is a mix of technical lab work and engineering. So perhaps his rate is on the lower side of the engineering scale. Maybe SGD 35-45 per hour. Converting SGD to USD, since the answer needs to be in USD. Current exchange rate is about 1 SGD to 0.74 USD. So SGD 35 is about USD 25.9, SGD 45 is USD 33.3.

But also, he's pursuing a master's degree, which might increase his rate slightly. Maybe add a bit more. So perhaps USD 30-35 per hour. But considering the total experience is around 3 years, not too senior. Maybe the rate is around USD 30. However, in Singapore, engineering roles can vary. Let me think again. If a fresh grad engineer in Singapore might earn around SGD 3,500 monthly, which is about SGD 42k annually. That's SGD 20.19 per hour. With 3 years, maybe SGD 4,500 monthly, which is SGD 54k annually, about SGD 25.96 per hour. Freelance rate would be higher, maybe 1.5 times, so SGD 38.94, which is USD 28.80.

But maybe the user expects a higher rate, considering the roles. Assayer might be a niche role. Alternatively, maybe the engineer role at Sumitomo is more specialized. Alternatively, perhaps the rate should be around USD 25-35. Let's go with USD 30 as a midpoint. But I'm not entirely sure. Maybe check some sources. According to Payscale, the average hourly rate for a Chemical Engineer in Singapore is around SGD 30. That's about USD 22. But with a master's in progress, maybe a bit higher. Hmm. Alternatively, maybe the user is looking for a more US-based rate, but the location is Singapore. So take into account local rates.

Alternatively, maybe the answer should be around USD 25-35. Let's settle on USD 30 as a reasonable estimate.