Principal Test Engineer Based in Stevenage Circa 64,000 Hybrid, 2 to 3 days on site You''ve spent years making sure things actually work before they''re trusted with something that matters. Now you want to lead that thinking, not just execute someone else''s test plan. This is a senior test engineering role inside a design team. You won''t be testing what someone else designed after the fact, you''ll be shaping testability into the design from the start, then owning the equipment, the coverage, and the trade-offs that follow. What you''ll actually be doing You''ll specify pass-out tests, in-service checks and BIT routines, and you''ll make sure they''re built into the product from the design stage rather than bolted on afterwards. You''ll lead a small team of test architects, act as a senior voice within the test department, and work directly with the Chief Design Engineer on the cost versus coverage decisions that shape the whole programme. Day to day, that means: Owning complex test equipment specification and delivery, end-to-end Generating and managing lower-level test requirements for design teams, including test access, BIT coverage and timing, and factory test functionality Analysing and modelling systems to determine test coverage and generate diagnostic instructions Leading a team of test architects and providing functional leadership within the wider department Working closely with design and manufacturing teams to close testability gaps before they ..... full job details .....