To determine your chances of securing a mixed design-development job with your portfolio, several factors should be considered:
Portfolio Content: Your portfolio should effectively showcase both your design and development skills. Highlight projects that demonstrate your aptitude in user interface and user experience design as well as your competency in front-end or back-end development work. Employers look for a well-rounded skill set in these hybrid roles.
Quality of Work: Ensure that the projects presented in your portfolio are of high quality. This includes not only the final product but also the processes you followed, such as research, ideation, prototyping, coding, and testing. Describe your role in each project clearly.
Presentation and Clarity: Your portfolio should be well-organized and easy to navigate. Use clear headings, concise descriptions, and visuals or screenshots to illustrate your work effectively. An intuitive presentation mirrors the design skills you claim to have.
Technical Skills: Be explicit about the technologies, tools, and methodologies you are proficient in. Mention any coding languages, design tools, and frameworks you excel in. Citing specific examples from your projects where you applied these skills can be compelling.
Results and Impact: If possible, include metrics or feedback on how your design and development work improved user experience, satisfaction, or business outcomes. Quantitative evidence of your impact strengthens your application.
Diverse Experience: Variety in your projects can show adaptability and a wide range of skills. Include different types of design and development work, catering to various industries or problem types.
Testimonials and Recognition: Including testimonials from clients, colleagues, or mentors, as well as any awards or recognitions, can provide third-party validation of your skills and professionalism.
Market Demand and Competition: Be aware of the demand for mixed design-development roles in your geographic location or desired industry and how crowded the field might be. This can affect your chances significantly.

By evaluating your portfolio against these points, you can gauge your readiness and make improvements where needed, thereby increasing your chances of securing the desired role. Additionally, get feedback from peers or mentors to further refine your portfolio.