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mahadizulfiker
Mahadi Zulfiker
Open to work · Remote · GMT+6

Mahadi Zulfiker

full-stack software engineer in Dhaka, Bangladesh

I build voice-AI and commerce systems end-to-end: Bangla-speaking phone agents, wallet ledgers that have to balance, marketplaces that pay vendors correctly. Next.js, Node, PostgreSQL, React Native.

View work
years shipping
3
products shipped
19
built solo, end to end
9
resultCut a 32% incomplete-score rate on AI reports to near zero.Talktivity · core contributor
scroll
01selected work

Things I’ve built

Mobile app2025–2026

Talktivity

DecisionReplaced probabilistic parsing of the model’s report with deterministic scoring, and enforced per-plan voice-time…
CostDeterministic scoring is stricter and occasionally rejects a valid-but-oddly-shaped model response, so it needed a…

Cut a 32% incomplete-score rate on AI reports to near zero.

Next.jsReact NativeExpoNode/ExpressLiveKit / WebRTCGroq (STT/LLM)
Core contributorPrivate repo
Core frontend + recent React Native mobile work (team of ~6–8).
Web app2026

SeloraX Voice AI

DecisionBridged a SIP telephony gateway into a realtime LiveKit audio pipeline feeding Gemini Live, and paired it with a…
CostA custom TTS voice is far more work than a hosted one and has to be maintained, but no hosted option produced acceptable…
Gemini LiveLiveKitSIP gatewayCustom Bangla TTSNode.jsRealtime audio
Primary authorPrivate repo
Primary builder of the voice-AI engine.
Web app2025–2026

Smart Sheba

DecisionSplit the system into customer, dashboard, super-admin, and control-plane services over one Postgres core, and modeled…
CostAn append-only ledger is more code and more careful queries than a single balance column, but it is the only version…
Next.jsNode.jsPostgreSQLPrismaInngestWallet / ledger
Sole authorPrivate repo
Website2026

NewTech Engineering

DecisionBuilt a Next.js front end over a Prisma/Postgres schema with an authenticated admin:
CostA full CMS is more up-front work than a static rebuild, but it removes the developer from every future content change,…
Next.js 16React 19TypeScriptPrisma / PostgreSQLNextAuthAWS S3 / R2
Primary authorPrivate repo
commits authored
3,087
repositories
46
shipped products
19
led or built solo
16
Web app11Mobile app2Website2Package2Plugin1Game1
All work
02under the hood

How the hard parts actually work

a call, end to endSeloraX Voice AI case study

A SIP gateway bridges a real phone call into a realtime LiveKit pipeline feeding Gemini Live, and the reply comes back through a custom Bangla voice. The accented path is the one the 300 ms latency budget lives on.

SeloraX Voice AI call pathA phone caller reaches a SIP gateway, which bridges into a realtime LiveKit room feeding Gemini Live. The reply is spoken by a custom Bangla text-to-speech voice and returned down the same call, the latency-critical path.CALLERinbound / outboundSIP GATEWAYtelephonyLIVEKITrealtime audioGEMINI LIVEreasoningBANGLA TTScustom voicespoken reply
call path · accent marks the latency-critical return

Client system, shown as an architecture narrative only: no source code, credentials, or user data.

03about

Engineer who ships the whole thing

I’m Mahadi Zulfiker, a full-stack engineer with 3 years building production systems end-to-end: architecture, backend, interface, and deployment. Most of my work lives where things are hard to fake: realtime voice agents, wallet ledgers, multi-vendor marketplaces.

I like problems with a correctness cost, money that has to add up, a call that has to answer in Bangla under 300 ms, a score report that can’t silently fail. I’d rather write the stricter version that stays right than the quick one that drifts.

Comfortable owning a product solo, and comfortable being one of eight on a platform. I care about the details a reviewer actually notices, the empty state, the focus ring, the number that lines up.

Focus
Voice-AI · Commerce · Platforms
Now
Full-stack engineer @ SeloraX
Stack
Next.js · Node · PostgreSQL · RN
Based
Dhaka, Bangladesh (GMT+6)
Study
BSc CSE, Uttara University
04experience

Where I’ve worked

  1. Nov 2025 → PresentHybrid · Dhaka, Bangladesh

    Full-Stack Software Engineer

    SeloraX

    Building AI and commerce products end-to-end across the PERN/Next.js stack.

    • Built the SeloraX voice-AI call agent engine (realtime Bangla speech over a SIP gateway).
    • Sole author of Smart Sheba, a Daraz-style marketplace with a wallet and tree commission engine.
    • Shipped SEO Studio and AI Marketing Studio tools; published internal npm packages.
    • Contributor to the core multi-tenant SaaS: backend, dashboard, and frontend.
    shipped thereand 6 more
  2. Jun 2025 → PresentRemote

    Full-Stack Engineer

    Talktivity

    Building a realtime voice-AI English tutor that scores spoken English and returns a CEFR report.

    • Own the React Native / Expo mobile app and over half of the Next.js web frontend.
    • Work across the realtime audio pipeline: LiveKit/WebRTC with Groq STT/LLM and Kokoro TTS.
    • Cut a 32% incomplete-score rate on AI reports to near zero by reworking the BullMQ scoring queue.
    shipped there
  3. Aug 2025 → Oct 2025Remote · Korea

    Full-Stack Engineer

    Anirix

    Built and optimized scalable full-stack features across backend services and UI.

    • Developed backend services and frontend improvements with modern frameworks.
    • Worked across a distributed, remote team.
    focus
    • Backend services
    • Frontend UI
    • Distributed remote team
  4. Jun 2025 → Jul 2025Dhaka, Bangladesh

    Frontend Engineer

    Softvence Agency

    Delivered responsive, client-ready interfaces with a focus on UI polish.

    • Built reusable component architecture and improved front-end performance.
    focus
    • Client-ready interfaces
    • Reusable components
    • Front-end performance
  5. Jan 2025 → Aug 2025Bangladesh

    Co-Founder & Full-Stack Engineer

    AMGoal

    Co-founded and built the product end-to-end.

    • Owned architecture, backend, frontend, and delivery.
    shipped there
before engineering
  • Data Annotator·Intelligent MachinesOct 2020 → Mar 2021
Education
  • BSc in Computer Science & Engineering (Honors)Ongoing
    Uttara University · 2024–2027
  • HSC & SSC
    Uttara High School & College · 2023
05toolkit

What I build with

Frontend
ReactNext.jsTypeScriptTailwind CSSReduxshadcn/uiReact Native
Backend
Node.jsExpressNestJSRESTGraphQLPrisma
Data
PostgreSQLMongoDBMySQLRedis
Platform & DevOps
DockerVercelCI/CDAWS S3 / R2npm packagesGit
AI & Realtime
LiveKit / WebRTCGeminiGroqLLM integrationTTS/STT
Payments
StripeSSLCommerzAamarPayLemon SqueezyEPS
06contact

Let’s build something

Open to work

I’m Mahadi Zulfiker, open to full-time software engineering roles and select freelance work, from Dhaka, Bangladesh (GMT+6). If you’re hiring or have a system that needs building, the fastest way to reach me is email. I reply within a day.

mahade.adib45@gmail.com
WhatsApp · +880 1862 183566Download résumé
Based
Dhaka, Bangladesh · GMT+6
Open to
Full-time roles, select freelance
Reply
Within a day
Notice
Available to talk now
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