Mid-Level Full Stack Engineer Resume Example
Mid-level full stack engineers get hired when they prove end-to-end ownership measured by system performance, not by completing tasks within isolated layers of the stack.
This resume is for full stack engineers who own complex features from UI to database and mentor junior team members, but are not yet responsible for department-wide technical roadmaps.
- Ownership of full-stack features from front-end state management to database schema design
- Evidence of performance improvements, infrastructure cost savings, or user conversion gains
- Participation in technical mentorship, code reviews, or design system contributions
- Technical skills categorized by front-end, back-end, and infrastructure layers
- Experience bullets leading with technical outcomes followed by specific metrics
- Education and certifications placed at the bottom to prioritize professional impact
Daniel Vargas
Summary
Experience
- Developed a real-time portfolio tracking dashboard using React and WebSockets, reducing data latency by 32% for 500k+ active users.
- Optimized PostgreSQL query patterns for transaction history, cutting database CPU utilization by 25% during peak trading volume.
- Mentored 2 junior engineers on front-end architecture and state management patterns within the internal design system.
- Launched an automated KYC verification flow that increased user onboarding conversion from 68% to 82%.
- Built a custom analytics visualization tool using D3.js and Node.js to track build performance across 12 microservices.
- Refined the caching strategy for the build runner API, resulting in a $45K reduction in annual infrastructure costs.
- Owned the end-to-end migration of the legacy billing UI to a modern React-based component library, reducing technical debt by 15%.
Education
Skills
JavaScript · Python · SQL · Git · REST APIs · React · Node.js · PostgreSQL · Docker · AWS · Redis · GraphQL · WebSockets · D3.js · System Design
What makes this resume effective
- This resume meets the hiring bar for mid full stack engineers by demonstrating end-to-end feature ownership, measurable performance gains, and technical mentorship.
- Notice how Daniel Vargas highlights his work at Coinbase reducing data latency by 32% for 500k users, which proves he can handle production-scale performance challenges.
- See how the CircleCI experience focuses on specific business outcomes like the $45K reduction in annual infrastructure costs through caching strategy refinements.
How to write better bullet points
Reduced technical debt across the front end.
Reduced technical debt by 15% by migrating the legacy billing UI to a React-based component library.
It specifies the exact project, the technology used, and the measurable reduction in debt.
Helped onboard new developers to the team.
Mentored 2 junior engineers on front-end architecture and state management patterns within the internal design system.
It demonstrates technical leadership and specific domain expertise rather than passive participation.
Worked on database queries to make them faster.
Optimized PostgreSQL query patterns for transaction history, cutting database CPU utilization by 25% during peak volume.
It ties a concrete technical action to a specific performance gain during a high-stakes scenario.
Mid-Level Full Stack Engineer resume writing tips
- Connect database optimizations to hardware savings or user experience improvements to prove full-stack impact.
- Include metrics like latency reduction or conversion rates to show you understand the business value of your code.
- Mention informal leadership, such as mentoring juniors or owning a component library migration, to signal senior-level potential.
Common mistakes
- Focusing only on one side of the stack when the role requires cross-functional ownership.
- Listing tasks completed instead of describing the technical decisions made and their subsequent outcomes.
- Omitting the scale of the systems worked on, making it difficult for recruiters to judge production readiness.
Frequently asked questions
Is this resume right for someone with 3-5 years of experience? Yes, if you are regularly owning features from start to finish and making independent technical decisions without constant supervision.
Yes, if you are regularly owning features from start to finish and making independent technical decisions without constant supervision.
Yes, if you are regularly owning features from start to finish and making technical decisions without constant supervision. It is likely not the right fit if your experience is still limited to small bug fixes or single-layer tasks.
What if my background is in a different industry than fintech or DevOps? Yes, because full-stack ownership principles apply universally. Focus on your delivery speed and the breadth of your technical responsibilities.
Yes, because full-stack ownership principles apply universally. Focus on your delivery speed and the breadth of your technical responsibilities.
The principles of full-stack ownership remain the same across industries. Focus on the breadth of your responsibilities and the speed of your delivery, regardless of the specific domain.
What if I don't have access to specific performance metrics like latency percentages? Use proxy metrics like user volume or the reduction in manual support tickets to demonstrate the 'before and after' state of the systems you touched.
Use proxy metrics like user volume or the reduction in manual support tickets to demonstrate the 'before and after' state of the systems you touched.
You can use proxy metrics like the number of users impacted or the reduction in manual support tickets. Focus on the 'before and after' state of the systems you touched to show change.
How much should I change before applying? Keep the outcome-focused structure but swap specific technologies like Redis or GraphQL for the tools mentioned in the specific job description.
Keep the outcome-focused structure but swap specific technologies like Redis or GraphQL for the tools mentioned in the specific job description.
Keep the structure but update the technologies to match the job description. In this resume, Daniel Vargas lists Redis and GraphQL, but you should swap those for the specific tools mentioned in the posting.
What do hiring managers focus on at this level? Hiring managers look for technical autonomy and the ability to solve problems without hand-holding, evidenced by owning end-to-end migrations.
Hiring managers look for technical autonomy and the ability to solve problems without hand-holding, evidenced by owning end-to-end migrations.
Recruiters look for technical autonomy and the ability to solve problems without hand-holding. This resume signals that by showing Daniel owned the end-to-end migration of a billing UI at CircleCI.
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