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Senior engineering hiring is about more than producing code: employer guidance points to technical judgment, system-level design, ownership, delivery, leadership, and communication. That does not mean every hiring manager rejects todo apps—or that a personal project is required. A project is useful when it makes your engineering decisions and contribution clear.
What senior engineering roles ask you to demonstrate
Seniority is not a universal checklist, and requirements differ by employer and role. Amazon’s description of its SDE III role, for example, emphasizes advising on technical and business issues, leading a team, and building high-performance, stable, scalable systems. It also expects code to be secure, maintainable, scalable, and extensible. Amazon’s SDE III interview guidance adds system-wide architectural thinking and design objectives such as practicality, accuracy, efficiency, reliability, optimization, and scalability.
A specific Google Senior Software Engineer, Core posting likewise connects the role to writing and testing code, design reviews with peers and stakeholders, code review, documentation, and technical leadership. That posting lists five years of software development experience, three years testing, maintaining, or launching software products, and one year of software design and architecture experience as minimum qualifications; one year of technical leadership is preferred. These are qualifications for that posting, not a standard that defines every senior role. Google Careers’ role posting
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- Role scope: Show whether your work concerned a feature, a service, a system, or coordination across teams.
- Technical judgment: Explain how you considered correctness, maintainability, reliability, security, scalability, and tradeoffs.
- Delivery: Describe the work you designed, implemented, tested, launched, or maintained, and give substantiated outcomes where available.
- Leadership and collaboration: Be ready to discuss technical guidance, reviews, stakeholder communication, mentoring, and how you responded to feedback.
What interviews may evaluate
Interview formats vary by employer. Amazon’s SDE III preparation page names coding, system design, and Leadership Principles evaluation, and says interviewers focus on what candidates did, how they did it, and why they made decisions. Its coding guidance emphasizes syntactically correct, scalable, robust, well-tested code and checking edge cases; its behavioral guidance recommends detailed examples from previous jobs and the STAR method. The page says, “We won’t ask brain teasers.” It explains: “Instead, we’ll focus on the ‘what’ and ‘how’ of your experiences, as well as the ‘why’ of your decisions.” Those are Amazon’s stated expectations for this interview process, not a guarantee about other companies. Amazon SDE III interview preparation
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Practitioner views offer another perspective, not a statistically representative hiring rule. A February 2025 Lemon.io hiring guide quotes engineering leaders emphasizing comfort with common coding structures, curiosity about why something works or fails, listening, asking questions, and explaining reasoning aloud. Lemon.io’s software-engineer hiring guide
Should you build a todo app or another portfolio project?
The available employer materials do not establish a universal ranking of personal projects against professional experience or interview performance. They also do not show that a generic todo app is either a hiring requirement or an automatic disqualifier. A project can still help you explain engineering decisions, but its value depends on what it makes visible and how closely it lets you discuss the role’s work.
Instead of adding features merely to make a familiar app look larger, make your contribution legible. Explain the problem and constraints, what you personally built, the important decisions and alternatives, how you tested the result, how it handles failures, and what outcomes you can credibly support. Treat those points as practical ways to present evidence—not as a guaranteed portfolio rubric used by every hiring manager.
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- State the user problem and the constraints that shaped your design.
- Separate your own contribution from collaborators’ work or tools you used.
- Show a consequential technical decision, the alternative you considered, and the tradeoff.
- Describe tests, edge cases, operational concerns, and failure handling that are relevant to the project.
- Report only outcomes you can substantiate; do not imply that a repository alone proves impact.
Do not assume interviewers will clone or deeply inspect every repository. A clear explanation gives you a stronger basis for discussing the work if it comes up.
How to prepare for a specific senior role
- Read the actual job posting. Separate its stated minimum qualifications, preferred qualifications, and responsibilities. Do not treat one company’s language as a field-wide definition.
- Map your experience to its scope. Choose examples that show the relevant mix of system design, implementation, testing, delivery, maintenance, and collaboration.
- Prepare decision-focused stories. For each example, be able to explain the situation, your responsibility, the choices you made, why you made them, and what happened.
- Check the employer’s interview guidance. Prepare for the formats and evaluation areas that employer actually names rather than assuming every process uses the same exercises.
- Use projects selectively. Include a personal project when it gives you concrete, relevant decisions or outcomes to discuss; do not build one solely because you believe every senior candidate needs a todo app.
What recent interview data can—and cannot—tell you
A September 2026 arXiv preprint by Vitalii Romaniuk reports retrospective survey results from 911 software-engineering community respondents. For its 2023–2026 “Era IV,” the paper reports a mean of 5.47 hours of live interviews and 4.64 interview rounds. These are sample retrospections, not universal current interview durations or a representative census. The author says the findings do not establish causality or an archival population history. Romaniuk’s 2026 preprint
The same paper evaluates public interview-preparation prompts, but its benchmark is not tied to one company, technology stack, seniority level, or job description. It therefore cannot establish what senior hiring managers specifically require. Use employer-published role and interview materials for the target job, and treat broader interview statistics as context rather than a personal preparation formula.
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