50 Side Project Ideas for Staff / Principal Engineers in 2026
By Cristian Lascu · The Sovereign Technologist
Most staff engineers have more leverage than they realise — their skills solve problems people are actively willing to pay for. The challenge is knowing where to start. These side project ideas are ranked by difficulty and revenue potential, based on what's actually working for technical professionals building income outside employment in 2026.
Starter Side Projects for Staff Engineers
- Technical Due Diligence for VCsintermediate1–3 weeks to first engagement
Evaluate the engineering quality of companies a VC is considering investing in. Review architecture, hiring practices, technical debt, and team capability. High-value, low-time engagement.
high potential
- Architecture Consulting Retainerintermediate2–4 weeks
Offer a monthly architecture advisory retainer to 2–3 growth-stage companies. Review technical decisions, attend architecture reviews, and give written recommendations.
high potential
- Engineering Strategy Writingbeginner3–6 months to monetize
Write a paid newsletter or blog on engineering strategy — how technical leaders make high-stakes decisions, communicate to the board, and balance short-term delivery with long-term health.
high potential
- Fractional Staff Engineer for Startupsintermediate2–4 weeks
Offer your staff-level influence on a fractional basis: join 2–3 startups for 1 day/week each, attending architecture reviews and advising on technical direction.
high potential
- Book: Software Engineering at Scaleadvanced9–18 months
Write a practical book on operating at staff/principal level — beyond individual contribution to technical strategy and cross-team influence. This tier of experience is rare in published form.
high potential
- Open-Source Project with Commercial Supportadvanced6–12 months
Build an open-source tool addressing a real staff-level engineering problem. Offer paid support, priority feature requests, and enterprise licensing to generate revenue.
high potential
- Engineering Strategy Workshop for CTOsadvanced2–4 weeks
Facilitate a full-day workshop helping a CTO and their engineering leadership team define a 12-month engineering strategy — roadmap, team structure, and tech debt approach.
high potential
- Staff Engineer Career Coachingbeginner1–2 weeks
Coach senior engineers trying to get promoted to staff level. Cover the influence, visibility, and project selection strategies that make the difference at this career stage.
high potential
- Technical Podcast or Video Seriesintermediate6–12 months to significant audience
Launch a podcast or YouTube channel featuring conversations with other staff/principal engineers on technical strategy, org dynamics, and the reality of operating at this level.
medium potential
- ADR and RFC Process Designbeginner1–2 weeks
Offer consulting to companies that want to implement or improve their Architecture Decision Record and RFC process. Fewer than 10% of companies do this well.
medium potential
- Platform Engineering Leadership Consultingadvanced2–6 weeks
Help engineering leaders design and build internal developer platforms — service catalogues, self-service tooling, golden paths. Few people have both the technical and leadership depth.
high potential
- Conference Speaking on Engineering Strategybeginner3–6 months
Build a speaking portfolio on engineering strategy topics. QCon, GOTO, and LeadDev actively seek staff/principal-level speakers with real-world implementation experience.
medium potential
Scalable Staff Engineer Businesses
- Engineering Excellence Consulting Practiceadvanced3–6 months
Build a boutique practice focused on engineering excellence — code review culture, architectural governance, and technical decision frameworks. Position as the standard for what 'good' looks like.
high potential
- Staff-to-Founder Acceleratorintermediate3–6 months
Run a program helping staff engineers transition to technical founder or independent consultant roles. Their leverage is real; what they lack is a commercial framework.
high potential
- Technical Investor Angel Syndicateadvanced6–18 months
Leverage your ability to evaluate engineering quality to invest early in technical startups via an angel syndicate. Your diligence skills are your edge.
high potential
Pro tips
- →Start with something you'd build anyway for your own use. The best side projects solve a problem you personally experience — your domain knowledge reduces risk dramatically.
- →Don't wait for a perfect idea. Ship a 'good enough' version in 4 weeks and let real users tell you what to build next. Most successful side projects look nothing like the original idea.
- →Choose a distribution strategy before you write a line of code. 'If you build it they will come' is how most side projects die. Who specifically will use this, and how will they find it?
- →Price higher than feels comfortable. Staff / Principal Engineers consistently undercharge. If your first 10 customers didn't push back on price at all, you're underpriced by at least 50%.
- →Protect your energy. A side project that requires 40 hours a week is just another job. Pick something that can move meaningfully on 5–10 hours a week, at least at the start.
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