As you want to get the details of career and courses after B.Tech in Agricultural Engineering so here it is for you:

Higher Education Programs after B.Tech in Agricultural Engineering (India)

Master of Technology in Agricultural Engineering
Master of Technology in Agricultural Process and Food Engineering
Master of Technology in Agricultural Systems and Management
Master of Technology in Aqua Cultural Engineering
Master of Technology in Farm Machinery and Power Engineering
Master of Technology in Farm Power & Machinery
Master of Technology in Irrigation and Drainage Engineering
Master of Technology in Post Harvest Engineering and Technology
Master of Technology in Post Harvest Processing and Food Engineering
Master of Technology in Renewable Energy Engineering and Management
Master of Technology in Soil Water Conservation Engineering
Master of Science in Rural Technology
Master of Business Administration in International Agri Business

Higher Education Programs after B.Tech in Agricultural Engineering (Abroad)

Master of Engineering in Agricultural Engineering
Master of Engineering Science - Agricultural Engineering
Master of Engineering Technology - Agricultural Engineering
Master of Science in Agricultural Engineering
Master of Science in Agricultural and Biosystems Engineering
Master of Science in Master of Science in Agricultural Process Engineering by Research
Master of Science in Agricultural Waste Engineering by Research
Master of Science (M.S.) in Biosystems and Agricultural Engineering
Master of Science in Biological and Agricultural Engineering
Masters in Agricultural Production Engineering
Master of Science in Agricultural and Biological Engineering
Master of Science in Agricultural and Biological Engineering
Master of Science in Agricultural Engineering - Computational Science and Engineering
Masters of Science in Agriculture - Agricultural Engineering Technology
Master of Science in Agricultural and Bioresource Engineering - Agricultural Engineering (Farm Technology)
Master of Science in Agricultural and Bioresource Engineering - Environmental Engineering
Master of Science in Biological and Agricultural Engineering
Master of Engineering (M. Engr.) in Biological and Agricultural Engineering
Master of Science in Agricultural, Environmental and Regional Economics
Master of Science in Food, Agricultural and Biological Engineering

Career in Private sector after B.Tech in Agriculture Engineering:
Some of the private companies recruiting B.Tech in Agriculture graduate include the following.

A.G. Sunseeds Pvt. Ltd.
Advanta India Limited
Agro Biotech
Balaji Seed Pvt Ltd
Bhakti Biotech Pvt. Ltd.
Daftari Agro Private Limited
Nath Royal Ltd
Proagro Seed Company Ltd
Sunseeds India Private Limited
Indo American Hybrid Seeds (India) Pvt. Ltd
Novartis India: Seeds Division
Namdhari Seeds (Pvt) Ltd
Agro Biotech
Century Seeds Pvt. Ltd
Indo-American Hybrid Seeds (India) Pvt. Ltd

Government Career after B.Tech in Agriculture Engineering:
Some of the Government Organizations that recruit B.Tech in Agriculture Engineering graduates include the following.

Directorate of Oil Palm Research
National Dairy Development Board
Food Corporation of India
National Seeds Corporations
Indian Agricultural Research Institute
Indian Council of Agricultural Research
Cabinet Secretariat, Government of India, New Delhi
United India Insurance Company Limited
Natural Agricultural Innovative Projects
Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth