ABAP Nusantara
Mu'tashim Billah

Mu'tashim Billah

SAP Technical Consultant

Available for freelance SAP ABAP work

Hire me for SAP Technical Development.

I'm an SAP Technical Consultant with 4+ years of hands-on S/4HANA development across MM, SD, FI and CO — WRICEF, RAP, CDS, OData, Fiori and SAP CPI integrations. Available directly for freelance work: no agency, no account manager, just me.

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[ Why work with me ]

Direct, transparent, no overhead

You talk to me, not an account manager

No sales layer, no project manager relaying messages — every message and every line of code goes through me directly.

4+ years on enterprise S/4HANA projects

WRICEF, RAP and CPI work delivered for large Indonesian enterprises in retail and automotive — running in production, not just tutorials.

Quality built in, from a QA background

Years of leading QA and UAT for web apps, APIs and S/4HANA mean I test my own work thoroughly and know what a clean go-live needs.

Project-based, no long-term contract

Engage for a single fix, a feature, or an ongoing arrangement — whichever fits, with no retainer required.

[ Expertise ]

What I can help with

ABAP & WRICEF

Reports, interfaces, conversions, enhancements (BAdI, user exits), Smartforms and ABAP OO across MM, SD, FI and CO.

RAP, CDS & OData

CDS views and RAP business objects, exposed as OData services for Fiori apps and reporting.

SAP CPI integration

Inbound and outbound iFlows between SAP and external systems such as Google Pub/Sub, plus RFC, IDoc and BAPI interfaces.

Fiori / UI5

Freestyle Fiori/UI5 applications and the backend services behind them, built to improve real business workflows.

[ Experience ]

Where I've worked

  1. SAP S/4HANA ABAP Developer (RMM, SD & FICO) · Lion Super Indo

    Apr 2025 – Present

    • Delivered WRICEF developments across MM, SD, and FICO modules, including custom reports, interfaces, and OData services supporting operational and financial processes.
    • Implemented and enhanced Fiori applications and backend services to improve business workflow efficiency.
    • Developed and supported SAP CPI integrations to ensure seamless system communication.
    • Contributed to performance optimization and issue resolution in production environments.
    ABAPWRICEFODataFioriSAP CPI

  2. SAP S/4HANA ABAP Developer (Freelance) · Astra International

    Jan 2023 – Mar 2025

    • Delivered enterprise-level WRICEF developments across MM and FICO modules, supporting large-scale operational and financial processes.
    • Developed custom reports, interfaces, and OData services to enhance reporting automation and system integration.
    • Supported Fiori applications and backend enhancements to improve business workflow efficiency.
    • Provided technical support and issue resolution during UAT and production phases.
    ABAPWRICEFODataFiori

  3. Software Engineering Team Lead · Astra International

    Oct 2022 – Nov 2023

    • Led and mentored the QA team in executing testing strategies for web applications, APIs, and SAP S/4HANA systems.
    • Managed test planning, defect tracking, and delivery timelines to ensure high-quality releases.
    • Collaborated with developers and business stakeholders to align technical solutions with business needs.
    • Oversaw UAT execution and ensured readiness for production deployment.
    Test strategyUATTeam leadership

  4. Senior Product Quality Assurance Engineer · Astra International

    Nov 2021 – Mar 2025

    • Led functional and integration testing for web applications, APIs, and SAP S/4HANA systems.
    • Designed and executed test scenarios to ensure system stability, performance, and compliance with business requirements.
    • Coordinated User Acceptance Testing (UAT) with stakeholders to validate business processes before go-live.
    • Documented defects, test cases, and improvements in JIRA to support continuous system enhancement.
    Functional testingIntegration testingUATJIRA

[ Projects ]

Selected projects

E-Materai Integration

  • Developed custom ABAP logic for electronic stamp integration.
  • Implemented validation and monitoring mechanisms.
  • Ensured compliance with business and regulatory requirements.
ABAP

Stock Opname (Asset Stock Taking)

  • Developed custom reports and Smartforms for asset reconciliation.
  • Improved reporting accuracy and reduced manual reconciliation effort.
ABAPSmartforms

Google Pub/Sub & SAP CPI Integration (Inbound & Outbound)

  • Designed and implemented SAP CPI integration flows (outbound & inbound) between SAP and external systems for scalable, reliable data exchange.
  • Ensured data consistency and a scalable communication architecture.
SAP CPIGoogle Pub/Sub

RAP & Fiori Development

  • Developed CDS views and RAP business objects.
  • Exposed OData services for Fiori freestyle applications.
  • Supported financial and operational reporting enhancements.
RAPCDSODataFiori/UI5

[ Skills ]

Skills & tools

SAP Technologies

SAP ABAP (WRICEF, Enhancement, BAdI, User Exit)ABAP OOCDS ViewsRAP (RESTful ABAP Programming Model)OData ServicesSAP Fiori / UI5SAP CPI IntegrationSAP S/4HANA

Integration & Backend

RFC / IDoc / BAPISAP-to-SAP & SAP-to-Legacy integration

Development Tools

Eclipse (ABAP Development Tools)SAP GUIGit

Methodology

Agile / ScrumUAT Coordination

Core Competencies

Technical Problem SolvingStakeholder CommunicationCross-Functional CollaborationUAT & Production Support CoordinationAnalytical Thinking

Languages

Indonesian (Native)English (Professional Working Proficiency)Japanese (JLPT N4)

[ Credentials ]

Education & certifications

  • Computer Science — GPA 3.84/4.00

    STIMIK ESQ · 2017 – 2021

  • Oracle Database Design

    Oracle · 2020

  • Oracle Database Programming

    Oracle · 2020

  • Google IT Support Professional Certificate

    Google · 2021

  • Golang – Backend Development

    SanberCode · 2023

[ How it works ]

From first message to sign-off

  1. 1

    Tell me what you need

    A functional spec, a user story, or just a rough idea — whatever you have is fine to start with.

  2. 2

    Get an estimate

    I reply with a mandays estimate and a rough timeline, usually within 1–2 business days. No cost, no obligation.

  3. 3

    Agree scope, kick off

    A short written agreement covering scope and price — no long contract to sign.

  4. 4

    Development, with updates

    You get progress updates along the way, not just a final delivery out of nowhere.

  5. 5

    Test together, then invoice

    We go through UAT together before sign-off, then I invoice for the work delivered.

Every engagement is scoped individually

There's no fixed rate card — pricing depends on scope, timeline, and whether a day-rate or a fixed price fits better. Send over what you need and I'll come back with a straightforward estimate, no obligation to proceed.

[ Get in touch ]

Got a scope in mind?

Reach out on WhatsApp for the fastest reply, or email/LinkedIn if you prefer. I usually respond within 1–2 business days.

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Prefer to see the work first?

Everything here is public — read what I write and try what I've built before you reach out.

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