RDSO (Research Designs and Standards Organisation) is the technical arm of Indian Railways based in Lucknow. It is responsible for research and development of railway technology, setting technical standards, and testing new equipment. A Junior Engineer at RDSO is involved in applied R&D projects, testing of railway components, preparation of technical specifications, and inspection of products. It is a prestigious posting for engineering graduates interested in railway technology.

RDSO recruits Junior Engineers from multiple engineering disciplines including Civil Engineering, Mechanical Engineering, Electrical Engineering, Electronics & Communication Engineering, Computer Science, and Metallurgy. The vacancies and eligible disciplines vary with each recruitment notification. Candidates must hold a B.E./B.Tech. or equivalent degree in the relevant discipline from a recognised university or institution.

RDSO Junior Engineers are placed in 7th CPC Pay Matrix Level 6, with a basic pay of ₹35,400 per month. Including DA, HRA, and other technical allowances, the gross salary is approximately ₹45,000–₹60,000 per month. RDSO also offers Research Allowance and Technical Grade Pay in some categories. Housing, medical, and railway travel facilities are provided as part of the service benefits.

RRB JE (Junior Engineer) recruits engineers for field maintenance and operations across railway zones, while RDSO JE recruits for the R&D wing which develops technology and sets standards. RDSO postings are primarily in Lucknow at the central office and are more research-oriented. RRB JE involves field work at various stations and depots across the country. Both are at similar pay levels but offer very different work environments.

RDSO Junior Engineers are required to meet B1 medical standard, which requires distant vision of 6/9 in one eye and 6/12 in the other eye (with or without glasses). Minor colour vision deficiency may be acceptable for certain non-safety-critical posts. The standard is less stringent than A1 required for operational posts, making it accessible to candidates with moderate refractive errors.