You have completed your BE and then ME in computer Science. Most people in the IT industry are unsuccessful in getting a placement due to large number of applications and abscence of the right skill set with good quality.
1.Certification courses are helpful but at interviews weightage in give for job experience, working expereince on live projects and hands on training in good companies as apprentice.
2.Please get a good CV formatted, register in naukri.com, freshersworld.com,enggwave.com,shine.com,and linkedin if you haven't already done so.
3.Select a job that is open for freshers or even enroll as an apprentice
For instance, This is a job for Assoicate software engineer with eligibility being M.E(CS) https://www.freshersworld.com/jobs/company/huawei-technologies-368729
4.You can also select good PSUs for apprentice or intern jobs that you add value for your CV. Check jobs similar to this in Baba Atomic Research Centre for M.E (C.S) candidates.
5.you can join intern jobs that are for short durations 2-6 months, the pay would be less but it gives you a chance to work in good centers on live projects.
For instance, this (https://internshala.com/internship/detail/software-development-internship-in-chennai-at-htic-iit-madras1515125401) gives you a chance to work on in house projects related to healthcare technology/innovation.
6. you can check links like this that list intern jobs openings at IIT and major IT companies (https://internshala.com/internships/computer%20science-internship)
7. The certification courses are plenty that would be useful, you can choose any language programs, CISCO IT certifications, testing programs etc
CISCO CCNA routing and switching certification
STRUTS(framework for JAVA)
Some people opt for software testing to start with and get a certificate course in dynamic testing, regression testing, programming unit testing etc.