Internship Report

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\fancyhead[R]{\small Summer 2025}
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{\Huge\bfseries\color{headerblue} Internship Report\par}
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{\Large Software Engineering Intern\par}
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\begin{tabularx}{0.7\textwidth}{@{}lX@{}}
\textbf{Student Name:} & Alexandra Chen \\[6pt]
\textbf{Student ID:} & 2023-CS-4821 \\[6pt]
\textbf{University:} & Stanford University \\[6pt]
\textbf{Department:} & Computer Science \\[6pt]
\textbf{Degree Program:} & B.S. Computer Science \\[6pt]
\textbf{Company:} & Meridian Technologies Inc. \\[6pt]
\textbf{Department:} & Platform Engineering \\[6pt]
\textbf{Supervisor:} & Dr.\ Marcus Webb \\[6pt]
\textbf{Duration:} & June 2, 2025 -- August 22, 2025 \\[6pt]
\textbf{Report Date:} & September 5, 2025 \\
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{\large Department of Computer Science\\Stanford University\par}
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\section{Executive Summary}

This report documents my twelve-week internship at Meridian Technologies Inc., where I served as a Software Engineering Intern on the Platform Engineering team. During this period, I contributed to the development of an internal microservices monitoring dashboard, implemented automated anomaly detection for service health metrics, and participated in the migration of legacy REST endpoints to a GraphQL API layer. The experience provided substantial exposure to production-scale distributed systems and agile development workflows.

\section{Company Overview}

\subsection{About Meridian Technologies}

Meridian Technologies Inc.\ is a mid-size enterprise software company headquartered in San Jose, California, with approximately 2,400 employees across offices in Austin, Seattle, and Dublin. Founded in 2011, the company specializes in cloud infrastructure management and developer tooling for enterprise clients.

\subsection{Products and Services}

The company's flagship product, \textbf{MeridianOps}, is a unified platform for infrastructure orchestration, monitoring, and incident response. Key product lines include:

\begin{itemize}[leftmargin=*]
    \item \textbf{MeridianOps Core} -- Infrastructure provisioning and configuration management
    \item \textbf{MeridianOps Monitor} -- Real-time observability and alerting
    \item \textbf{MeridianOps Flow} -- CI/CD pipeline management
    \item \textbf{MeridianOps Secure} -- Compliance and security posture management
\end{itemize}

\subsection{Organizational Structure}

The Platform Engineering team sits within the broader Engineering division and is responsible for internal developer tooling, shared service libraries, and cross-cutting infrastructure concerns. The team consists of 14 engineers, 2 engineering managers, and 1 principal architect.

\section{Role Description}

\subsection{Position and Responsibilities}

As a Software Engineering Intern, my primary responsibilities included:

\begin{enumerate}[leftmargin=*]
    \item Designing and implementing front-end components for the internal service health dashboard using React and TypeScript
    \item Building backend API endpoints in Go to aggregate metrics from Prometheus and custom telemetry sources
    \item Developing an anomaly detection module using statistical process control methods
    \item Writing integration tests and contributing to the team's testing framework
    \item Participating in code reviews, sprint planning, and architecture design sessions
\end{enumerate}

\subsection{Tools and Technologies}

\begin{tabularx}{\textwidth}{@{}lX@{}}
\toprule
\textbf{Category} & \textbf{Technologies} \\
\midrule
Languages & Go, TypeScript, Python, SQL \\
Frontend & React, Next.js, Tailwind CSS, D3.js \\
Backend & Go (Chi router), gRPC, GraphQL \\
Databases & PostgreSQL, Redis, ClickHouse \\
Infrastructure & Kubernetes, Docker, Terraform \\
Monitoring & Prometheus, Grafana, OpenTelemetry \\
CI/CD & GitHub Actions, ArgoCD \\
Collaboration & Jira, Confluence, Slack, Figma \\
\bottomrule
\end{tabularx}

\section{Weekly Activity Log}

\subsection{Weeks 1--2: Onboarding and Environment Setup}

The first two weeks focused on orientation, environment configuration, and initial codebase familiarization.

\begin{itemize}[leftmargin=*]
    \item Completed company onboarding including security training and compliance modules
    \item Set up local development environment with Docker Compose for 12 microservices
    \item Read through architecture decision records (ADRs) and service dependency documentation
    \item Paired with senior engineer Priya Nair to understand the monitoring stack
    \item Completed starter task: fixed a pagination bug in the service catalog UI
\end{itemize}

\subsection{Weeks 3--4: Dashboard Foundation}

\begin{itemize}[leftmargin=*]
    \item Designed wireframes for the service health dashboard in Figma
    \item Implemented the dashboard layout with responsive grid components
    \item Built reusable chart components using D3.js for time-series visualization
    \item Created Go API handlers for fetching aggregated service metrics
    \item Wrote unit tests achieving 87\% code coverage for new components
\end{itemize}

\subsection{Weeks 5--6: Metrics Integration}

\begin{itemize}[leftmargin=*]
    \item Integrated Prometheus query API for real-time metric retrieval
    \item Implemented server-sent events (SSE) for live dashboard updates
    \item Added filtering and grouping capabilities (by team, service tier, region)
    \item Resolved performance bottleneck in metric aggregation reducing P99 latency from 2.3s to 340ms
    \item Presented mid-internship progress demo to the engineering organization
\end{itemize}

\subsection{Weeks 7--8: Anomaly Detection}

\begin{itemize}[leftmargin=*]
    \item Researched statistical methods for time-series anomaly detection
    \item Implemented CUSUM and EWMA algorithms for detecting metric deviations
    \item Built a configurable alerting pipeline with severity classification
    \item Integrated anomaly markers into the dashboard timeline visualization
    \item Wrote a design document proposing ML-based detection as a future enhancement
\end{itemize}

\subsection{Weeks 9--10: GraphQL Migration}

\begin{itemize}[leftmargin=*]
    \item Contributed to the team's REST-to-GraphQL migration initiative
    \item Implemented GraphQL resolvers for the service catalog and metrics domains
    \item Created a data loader pattern to solve the N+1 query problem
    \item Updated frontend components to use GraphQL queries with Apollo Client
    \item Reduced average API response payload size by 62\% through selective field queries
\end{itemize}

\subsection{Weeks 11--12: Polish and Handoff}

\begin{itemize}[leftmargin=*]
    \item Conducted usability testing with 8 engineers and incorporated feedback
    \item Added accessibility features (ARIA labels, keyboard navigation, color-blind safe palettes)
    \item Wrote comprehensive documentation in Confluence (setup guide, API reference, runbook)
    \item Created a handoff document with recommended follow-up tasks
    \item Delivered final presentation to the VP of Engineering and team leads
\end{itemize}

\section{Skills Developed}

\subsection{Technical Skills}

\begin{description}[leftmargin=*,font=\bfseries]
    \item[Distributed Systems] Gained practical understanding of service mesh architectures, eventual consistency, and observability patterns in production environments.
    \item[Go Programming] Advanced from beginner to intermediate proficiency in Go, including concurrency patterns (goroutines, channels) and idiomatic error handling.
    \item[Data Visualization] Developed expertise in D3.js for interactive, performant visualizations of high-cardinality time-series data.
    \item[GraphQL] Learned schema design principles, resolver implementation, and query optimization techniques.
\end{description}

\subsection{Professional Skills}

\begin{description}[leftmargin=*,font=\bfseries]
    \item[Agile Methodology] Participated in two-week sprint cycles including planning, daily standups, retrospectives, and backlog grooming.
    \item[Technical Communication] Wrote design documents, presented to cross-functional audiences, and practiced giving and receiving code review feedback.
    \item[Project Estimation] Learned to break down ambiguous problems into estimable tasks and communicate realistic timelines.
\end{description}

\section{Reflections}

\subsection{Key Takeaways}

This internship reinforced the significant gap between academic projects and production software engineering. Several lessons stand out:

\begin{enumerate}[leftmargin=*]
    \item \textbf{Operational concerns matter as much as features.} Logging, monitoring, graceful degradation, and deployment strategies consumed roughly 40\% of development effort---aspects rarely emphasized in coursework.

    \item \textbf{Code is read far more than it is written.} The team's emphasis on clear naming, comprehensive documentation, and small, reviewable pull requests dramatically improved collaboration velocity.

    \item \textbf{Trade-offs are everywhere.} Every design decision involved balancing consistency vs.\ availability, development speed vs.\ technical debt, and simplicity vs.\ flexibility.
\end{enumerate}

\subsection{Challenges Faced}

The most significant challenge was the metric aggregation performance issue encountered in Week 6. The initial implementation naively queried each service's metrics sequentially, resulting in unacceptable latency. Solving this required understanding Go's concurrency model and redesigning the data pipeline to use fan-out/fan-in patterns with bounded parallelism.

\subsection{Areas for Further Development}

\begin{itemize}[leftmargin=*]
    \item Deeper understanding of database internals and query optimization
    \item Kubernetes operator development and custom resource definitions
    \item Machine learning techniques for time-series forecasting
\end{itemize}

\section{Supervisor Evaluation}

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\textbf{Evaluation Criteria} & \textbf{Rating (1--5)} \\
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Technical competence & \rule{2cm}{0.4pt} \\[8pt]
Quality of work & \rule{2cm}{0.4pt} \\[8pt]
Initiative and self-direction & \rule{2cm}{0.4pt} \\[8pt]
Communication skills & \rule{2cm}{0.4pt} \\[8pt]
Teamwork and collaboration & \rule{2cm}{0.4pt} \\[8pt]
Adherence to deadlines & \rule{2cm}{0.4pt} \\[8pt]
Problem-solving ability & \rule{2cm}{0.4pt} \\[8pt]
Overall performance & \rule{2cm}{0.4pt} \\
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\noindent\textbf{Supervisor Comments:}

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\noindent
\begin{tabularx}{\textwidth}{@{}XX@{}}
\rule{6cm}{0.4pt} & \rule{6cm}{0.4pt} \\
Dr.\ Marcus Webb & Date \\
Supervisor, Platform Engineering & \\[2cm]
\rule{6cm}{0.4pt} & \rule{6cm}{0.4pt} \\
Alexandra Chen & Date \\
Intern & \\
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