# 32% of Senior Developers Say Half Their Shipped Code is AI-Generated
robot (spnet, 1) → All – 14:22:02 2025-09-08
In July 791 professional coders were surveyed by Fastly about their use of AI coding tools, reports InfoWorld. The results?
"About a third of senior developers (10+ years of experience) say over half their shipped code is AI-generated," Fastly writes, "nearly two and a half times the rate reported by junior developers (0-2 years of experience), at 13%."
"AI will bench test code and find errors much faster than a human, repairing them seamlessly. This has been the case many times," one senior developer said...
Senior developers were also more likely to say they invest time fixing AI-generated code. Just under 30% of seniors reported editing AI output enough to offset most of the time savings, compared to 17% of juniors. Even so, 59% of seniors say AI tools help them ship faster overall, compared to 49% of juniors. Just over 50% of junior developers say AI makes them moderately faster. By contrast, only 39% of more senior developers say the same.
But senior devs are more likely to report significant speed gains: 26% say AI makes them a lot faster, double the 13% of junior devs who agree. One reason for this gap may be that senior developers are simply better equipped to catch and correct AI's mistakes... Nearly 1 in 3 developers (28%) say they frequently have to fix or edit AI-generated code enough that it offsets most of the time savings. Only 14% say they rarely need to make changes. And yet, over half of developers still feel faster with AI tools like Copilot, Gemini, or Claude.
Fastly's survey isn't alone in calling AI productivity gains into question. A recent randomized controlled trial (RCT) of experienced open-source developers found something even more striking: when developers used AI tools, they took 19% longer to complete their tasks. This disconnect may come down to psychology. AI coding often feels smooth... but the early speed gains are often followed by cycles of editing, testing, and reworking that eat into any gains. This pattern is echoed both in conversations we've had with Fastly developers and in many of the comments we received in our survey...
Yet, AI still seems to improve developer job satisfaction. Nearly 80% of developers say AI tools make coding more enjoyable... Enjoyment doesn't equal efficiency, but in a profession wrestling with burnout and backlogs, that morale boost might still count for something.
Fastly quotes one developer who said their AI tool "saves time by using boilerplate code, but it also needs manual fixes for inefficiencies, which keep productivity in check."
The study also found the practice of green coding "goes up sharply with experience. Just over 56% of junior developers say they actively consider energy use in their work, while nearly 80% among mid- and senior-level engineers consider this when coding."
[ Read more of this story ]( https://developers.slashdot.org/story/25/09/07/0615217/32-of-senior-developers-say-half-their-shipped-code-is-ai-generated?utm_source=atom1.0moreanon&utm_medium=feed ) at Slashdot.
robot (spnet, 1) → All – 14:22:02 2025-09-08
In July 791 professional coders were surveyed by Fastly about their use of AI coding tools, reports InfoWorld. The results?
"About a third of senior developers (10+ years of experience) say over half their shipped code is AI-generated," Fastly writes, "nearly two and a half times the rate reported by junior developers (0-2 years of experience), at 13%."
"AI will bench test code and find errors much faster than a human, repairing them seamlessly. This has been the case many times," one senior developer said...
Senior developers were also more likely to say they invest time fixing AI-generated code. Just under 30% of seniors reported editing AI output enough to offset most of the time savings, compared to 17% of juniors. Even so, 59% of seniors say AI tools help them ship faster overall, compared to 49% of juniors. Just over 50% of junior developers say AI makes them moderately faster. By contrast, only 39% of more senior developers say the same.
But senior devs are more likely to report significant speed gains: 26% say AI makes them a lot faster, double the 13% of junior devs who agree. One reason for this gap may be that senior developers are simply better equipped to catch and correct AI's mistakes... Nearly 1 in 3 developers (28%) say they frequently have to fix or edit AI-generated code enough that it offsets most of the time savings. Only 14% say they rarely need to make changes. And yet, over half of developers still feel faster with AI tools like Copilot, Gemini, or Claude.
Fastly's survey isn't alone in calling AI productivity gains into question. A recent randomized controlled trial (RCT) of experienced open-source developers found something even more striking: when developers used AI tools, they took 19% longer to complete their tasks. This disconnect may come down to psychology. AI coding often feels smooth... but the early speed gains are often followed by cycles of editing, testing, and reworking that eat into any gains. This pattern is echoed both in conversations we've had with Fastly developers and in many of the comments we received in our survey...
Yet, AI still seems to improve developer job satisfaction. Nearly 80% of developers say AI tools make coding more enjoyable... Enjoyment doesn't equal efficiency, but in a profession wrestling with burnout and backlogs, that morale boost might still count for something.
Fastly quotes one developer who said their AI tool "saves time by using boilerplate code, but it also needs manual fixes for inefficiencies, which keep productivity in check."
The study also found the practice of green coding "goes up sharply with experience. Just over 56% of junior developers say they actively consider energy use in their work, while nearly 80% among mid- and senior-level engineers consider this when coding."
[ Read more of this story ]( https://developers.slashdot.org/story/25/09/07/0615217/32-of-senior-developers-say-half-their-shipped-code-is-ai-generated?utm_source=atom1.0moreanon&utm_medium=feed ) at Slashdot.