Senior Software Engineer - DV Cleared Location: Portsmouth, UK (3 days per week onsite) Employment Type: Permanent, Full-time Security Clearance: Active MoD DV Clearance Required Salary: £70,000 - £90,000 iO associates are seeking an experienced Senior Software Engineer to support the maintenance, enhancement, and modernisation of complex software systems within a secure environment. Requirements Active DV clearance. Strong software engineering experience in Python or C/C++ development. Strong understanding of software architecture, system integration, and modern engineering practices. Proven ability to lead technical investigations, solve complex problems, and implement sustainable solutions. Experience mentoring engineers and driving high standards of software quality. TPBN1_UKTJ