Resume

IdentityData & AI Engineer

Darrell Athaya Refaldi

Data & AI Engineer · Jakarta

darrell.athayaa@gmail.comGitHub ↗LinkedIn ↗

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Work experience

May 2026 – Jun 2026

Surabaya, Indonesia

Contract

System Development & Operations Assistant Lecturer · Information Systems Department, ITS

Teaching cloud and DevOps practice, 62 students

  • Taught cloud and DevOps workflows to 62 students, taking them from a local environment through deployments on Google Cloud Platform and Microsoft Azure.
  • Wrote the Microsoft Azure DevOps module documentation, which the course adopted as its standing reference.
  • Ran 105 progress-assistance sessions over 4 weeks debugging student cloud environments and deployments, then assessed 26 groups in the final evaluation.
DockerCI/CDGoogle Cloud PlatformMicrosoft Azure
DevOpsTeaching

Aug 2025 – Dec 2025

Jakarta, Indonesia

Internship

Information Technology Department Intern · PT Telekomunikasi Indonesia

Rebuilding a failing nightly pipeline, and an LLM cost study beside it

  • Took over an overnight Pentaho ELT job that failed intermittently and without warning, weighed the replacement options, and rebuilt it on Dagster and Airbyte.
  • Moved roughly 10,000 transaction records a day through a Dagster sensor that checks the source cheaply and starts an Airbyte sync only when new rows exist, so the expensive step runs on demand rather than on a fixed schedule.
  • Wrote every run to a log table with its outcome and metadata, so a night with no new data and a night where the sync broke stopped looking identical from the outside.
  • Stood the platform up on an isolated VM and documented the handover, so the internal team could run it without depending on one person.
  • Built the same Indonesian place-name normalizer four ways against an 80,534-entry reference register and compared them on tokens, cost, runtime and traceability before recommending one for production.
PythonSQLDagsterAirbyteDatabricks
Data EngineeringAI Engineering

Jan 2025 – Feb 2025

Jakarta, Indonesia

Internship

IT Infrastructure & Operations Division Intern · PT Bank Rakyat Indonesia

Infrastructure-as-code inside a bank's operations division

  • Automated web application deployment across 2 Red Hat Enterprise Linux virtual machines with Ansible over SSH, replacing a manual sequence run by hand on each box.
  • Wrote and maintained the Ansible playbooks as the definition of those servers, so a configuration could be rebuilt from its source rather than reconstructed from memory.
AnsibleRed Hat Enterprise LinuxSSHPython
DevOps
Leadership experience

Mar 2025 – Mar 2026

Surabaya, Indonesia

Contract

Expert Staff, Social Development Department · Information Systems Student Association (HMSI), ITS

Programme design and delegation

  • Rebuilt two annual work programmes and delegated their execution to 4 staff, supervising on a fixed check-in cycle rather than running them myself.
  • Themed the community-service programme around batik preservation and brought in international students, taking registration to 227% of target.
  • Designed a "searching for fish in a pile of trash" activity to make mangrove-area pollution legible to participants; registration beat target by 30%.
  • Named Best Staff of the Social Development Department for the 2025-2026 period.
LeadershipProgramme design

May 2024 – Oct 2024

Surabaya, Indonesia

Contract

Expert Staff, External Relations · RISE! 2024, Information Systems Expo ITS

Partnerships and outreach

  • Led a 6-person team taking promotion off campus, drawing 430 participants from more than 10 universities, up 76% year on year.
  • Pitched over 70 companies at board level and closed 2 strategic partners, PT Indonesia Asahan Aluminium (Inalum) and PT InfinitiGroup.
LeadershipPartnerships

Apr 2024 – Jul 2024

Surabaya, Indonesia

Contract

Mentor Staff · GERIGI ITS 2024, university orientation

Mentoring and assessment

  • Mentored a unit of 18 new students through orientation, out of a 6,485-student intake.
  • Delivered and assessed 8 modules covering the academic environment, campus norms, social media ethics, environmental awareness, collaboration, and the university's 4 development areas.
MentoringTeaching

Apr 2023 – Dec 2023

Surabaya, Indonesia

Contract

Staff, External Relations · RISE! 2023, Information Systems Expo ITS

Partnerships and competition governance

  • Approached 25 partner candidates directly and secured PT Petrokimia Gresik as a strategic partner.
  • Wrote the competition's technical guidelines, terms of reference and MoU binding every mentor, partner and participant, so the event ran without a dispute over terms.
  • Acted as sole liaison officer for semifinal judges, mentors and participants for the length of the competition.
PartnershipsGovernance
Competitions
  • CompetitorLIGA PKM 2025 2025
  • CompetitorFINDIT! 2025 User Experience Competition 2025
  • CompetitorISE! 2023 Data Science & Analytics 2023
Education
  • Bachelor of Information Systems · Institut Teknologi Sepuluh Nopember

    Aug 2022 – Aug 2026 · GPA 3.41/4.00 · Machine Learning Technology, Data Intensive Systems, Knowledge Graph, Data Lakehouse, Database Administration

Certifications
  • Agentic AI & RAG ↗

    IBM Skills Network · 2026

  • Introduction to SAP S/4HANA with GBI 4.2

    SAP University Alliances · 2024

Publications
  • Analisis Korelasi Pearson Faktor Pengaruh Generative AI terhadap Kemampuan Berpikir Kritis Mahasiswa ITS Surabaya

    Pearson Correlation Analysis of Generative AI Factors on Critical Thinking among ITS Students

    Jurnal Sistem Informasi dan Aplikasi · Vol. 2, No. 2, pp. 9-19 · 2024

  • Implementasi Prinsip Agile pada Pembuatan Aplikasi GreenTech

    Applying Agile Principles in GreenTech Application Development

    LANCAH: Jurnal Inovasi Dan Tren · Vol. 2, No. 2, pp. 663-680 · 2024

Intellectual property
  • Implementasi Program “FESTIPASS” Sebagai Sistem Digital Terintegrasi Untuk Penjualan dan Pembelian Tiket Konser

    FESTIPASS, an integrated digital system for concert ticket sales and purchasing

    Copyright · EC002025090557 · Directorate General of Intellectual Property (DJKI), Indonesia · 2025

Selected projects
  • Semantic Name Normalizer: Matching Cascade 2025-09 · Internship project, PT Telkom Indonesia · 3 of 4, recommended for production

    The version recommended for production: three cheap matching stages run first and the AI model only sees what none of them could resolve, cutting token use to a sixth of the naive approach while letting every result be traced back to the stage that produced it.

    PythonDatabricks & Hive MetastoreHugging Face
  • Transaction Data Ingestion Pipeline 2025-09 · Internship project, PT Telkom Indonesia

    The nightly pipeline I rebuilt at Telkom: it moves roughly 10,000 transaction records a day, asks the source a cheap question before starting an expensive sync, and records what happened on every run, including the runs where the answer was nothing.

    PythonDagsterAirbytePostgreSQL
  • Online Retail ELT Pipeline 2026-08 · Personal project, extends a data engineering internship

    A self-contained pipeline that pulls over a million rows of raw retail sales into a database, cleans it, and reshapes it into a small set of well-organized tables a business analyst can query directly in plain SQL, with 174 data-quality tests gating every build.

    PythonDagsterdbtPostgreSQLDocker
  • Smart Gate, Two-Factor Vehicle Access Control 2026 · Undergraduate thesis

    A campus-gate system that checks a motorcycle at exit against whoever actually rode it in, reading the plate and recognizing the rider's face, so a borrowed or stolen bike is refused the moment a different person tries to ride it out.

    PythonYOLOv8ArcFaceOCR ensemble
  • Manufacturing Defect Investigation Agent 2026-06 · Academic project

    Most factory inspection stops at a reject signal, which stops the bad part but not the next hundred. This treats the defect as the start of an investigation: an AI agent pulls the part's production history, compares it to past cases, and writes a root-cause report the way a quality engineer would.

    PythonNeo4j GDSMCPOllama
  • Education Dropout & Budget Insights Dashboard 2024-12 · Academic project

    A dashboard built around a decision rather than a dataset: it joins school-dropout counts, regional budget allocations and university admission records, so a policymaker can see which study programmes to prioritise and whether a district's budget matches its dropout problem.

    Power BIPentaho Data IntegrationSQL
Skills
Languages
PythonSQLTypeScriptCypherDart
Data & pipelines
DagsterdbtAirbyteDatabricksPentahoPostgreSQLNeo4jPower BI
AI & ML
PyTorchscikit-learnHugging FaceMLflowYOLOv8OpenCVFAISSMCP
Cloud & DevOps
DockerGitHub ActionsGoogle CloudMicrosoft AzureAnsibleLinuxGit