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CLASS: UC Architect
Nationality: Bulgarian
GUILD: Сдружение Лагера
LEVEL: ??
EXP: 10+ years
ZONE: Sofia, EMEA
INT: ████████░░
CHA: █████████░
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HERO SELECT

Kalin Stoimenov
KALIN STOIMENOV · LV.42 · SOFIA
КАЛИН СТОИМЕНОВ
Senior UC Architect with 10+ years designing communication systems that work when it matters. Microsoft Teams Phone, Direct Routing, SBCs, hybrid telephony — I've built them all.

Outside of tech: I write about the criminal and absurd corners of Bulgarian history, I help organize a neighborhood in Sofia, and I run tabletop RPGs.

I operate comfortably as strategist, hands-on architect, and coach. I wear whatever hat the team needs.
· · · · · · · · · ·
⚔ UC ARCHITECT

10+ years in enterprise unified communications. Teams Phone, Direct Routing, SBCs, hybrid voice. Architecture that's boring in the best way — reliable.

📜 WRITER & HISTORIAN

Scriptwriter for podcast "Анекдоткаст". Working on a debut book exploring the criminal, bizarre and comedic chapters of Bulgarian history.

🏛 COMMUNITY MEMBER

Long-time active member and IT lead at Сдружение Лагера in Sofia. Part of neighborhood cultural programs, festivals and civic projects.

🎲 NARRATIVE DESIGNER

Runs tabletop RPG campaigns. Historical scenarios, original mythology, immersive worldbuilding. Games are serious business.

EXPERIENCE LOG

SoftwareOne
Senior Unified Communications Consultant / Technical Lead (CEE)
2022 — PRESENT
Designing and deploying enterprise-grade telephony and UC solutions with focus on availability, security, and future-proofing. Acting as technical owner for complex deployments involving SBCs, PSTN providers and hybrid setups.
Architected Microsoft Teams Phone and Direct Routing environments across multiple enterprise customers
Led presales and architecture engagements — turning business requirements into working systems
Designed and delivered a high-availability Direct Routing platform under wartime conditions, proving that architecture decisions matter when conditions are far from ideal
Integrated an SBC solution connecting three separate PBX environments (Webex, Teams, Google) for a multi-brand enterprise — without changing their existing phone number provider contracts
Produced HLD/LLD documentation, configuration records, and runbooks people actually read
Coordinated closely with vendors, carriers, and internal teams through go-live and post-live stability
Teams Direct Routing SBC AudioCodes PSTN Presales Architecture
Netrix LLC / TetraVX
UC Engineer, Operations
2017 — 2022
Advanced UC engineering support for Microsoft Teams, Skype for Business, and SBC-based voice environments across large enterprise customers.
Troubleshot complex SIP, call flow, and interoperability issues across multi-vendor platforms
Led operational governance for key enterprise accounts — improved stability, reduced ticket noise, kept SLAs intact
Delivered long-form technical sessions under the Microsoft Ignite program
Key customers included major financial, automotive and professional services organizations
Teams Skype for Business SIP Operations Microsoft Ignite
GTT Ltd.
UC Engineer (L2 / L3)
2014 — 2017
Supported global enterprise environments. Developed strong instincts for escalation, reliability, and operational hygiene across diverse client infrastructures.
L2/L3 Support Enterprise Voice Escalation

SKILL TREE

📡 UNIFIED COMMUNICATIONS
  • MS Teams Phone
    97
  • Direct Routing
    96
  • Skype for Business
    88
  • SBC Configuration
    93
  • AudioCodes / Ribbon
    90
  • SIP / PSTN Integration
    92
  • Legacy PBX Interop
    85
  • Call Routing Design
    91
  • HA / Survivability
    88
  • Zoom Phone
    80
  • Google Voice / PSTN
    78
⚙ INFRASTRUCTURE & CLOUD
  • Azure (VM / Networking)
    50
  • Hybrid Voice Arch.
    90
  • Kamailio / FusionPBX
    76
  • TLS / PKI / Certs
    78
  • Microsoft 365
    88
📋 DELIVERY & LEADERSHIP
  • Presales Architecture
    92
  • HLD / LLD Docs
    90
  • Customer Architecture
    93
  • SLA Management
    86
  • Engineer Mentoring
    84
  • Vendor Coordination
    88
🖋 LORE & WRITING
  • Historical Research
    91
  • Scriptwriting
    85
  • Narrative Design
    90
  • Bulgarian History
    88
  • Worldbuilding
    93
★ · ★ · ★ · ★ · ★

🏆 ACHIEVEMENTS UNLOCKED

📡
SIP
MASTER
🏗
WARTIME
ARCHITECT
🎙
VOICE OF
HISTORY
📜
FUTURE
AUTHOR
🏛
CIVIC
MEMBER
🎲
DUNGEON
ARCHITECT
🐶
DOG
RESCUER
👶
NEW
PARENT

ACTIVE QUESTS

⚔ [MAIN QUEST] Enterprise Telephony Wars
Senior UC Architect at SoftwareOne. Designing and deploying Teams Phone and Direct Routing solutions across CEE. Presales architecture, SBC deployments, hybrid voice, vendor coordination. Making production reliable.
STATUS: ● ACTIVE
Teams Phone Direct Routing SBC PSTN Architecture
📻 [SIDE QUEST] Анекдоткаст
Podcast scriptwriter and researcher. Digging through Bulgarian history for the stories textbooks skipped: criminal, absurd, politically inconvenient. Narrative structure, historical analysis, dark comedy.
STATUS: ● COMPLETED / ARCHIVED
Podcast History Scriptwriting
📖 [SIDE QUEST] The Book
Debut manuscript in progress. Criminal and bizarre episodes from Bulgarian history, told through the backstreets of Ючбунар. Multiple sources, anti-hagiographic, light satirical voice.
STATUS: ● IN PROGRESS
Writing History Ючбунар
🏛 [GUILD QUEST] Лагера Празнува 2026
2-day community festival, April 2026. Live music, cultural programming, youth engagement. Organized with Читалище "Христо Смирненски". Sofia neighborhood culture built by the people who live there.
STATUS: ● IN PROGRESS
Festival Sofia Лагера

GUILD HALL — ASSOCIATION “LAGERA” (Сдружение Лагера)

📍 SOFIA, ЖК ЛАГЕРА (LAGERA QUARTER)
🏛 ROLE: IT LEAD & LONG-TIME ACTIVE MEMBER

Association “Lagera” is a civic, apolitical community organization in the Lagera quarter of Sofia. Mission: build a strong, united neighborhood through culture, solidarity and civic energy. I serve as IT lead — managing the website, social media, outreach, and technical operations — and have been an active participant in nearly every initiative the association has run.

🔗 lagera.org

// COMPLETED QUESTS — COMMUNITY VICTORIES

🎉 LAGERA CELEBRATES (Лагера Празнува) — 2021 to ONGOING
The flagship annual festival of the quarter — inspired by the old Easter spring gatherings when the whole neighborhood would come out together. Started in 2021 as a single-day resident-run event with word-of-mouth attendance, it has grown every year into one of Sofia's most-watched neighborhood festivals.

BY THE NUMBERS:
2021-22: First edition, entirely organized by local residents
2023: 2,500+ attendees · Interactive stage with big screen
2024: ~5,000 attendees over 2 days · Major sponsor growth
2025: 7,000+ attendees · BTV & BNR media coverage · Mayor of Sofia attended · 10+ corporate partners incl. Happy, Danone, Praktiker

ARTISTS ON STAGE: Tangra, Nikolina Chakardakova, Faktor, Fondatsiyata, Ensemble Bulgare

MY ROLE: Project manager for public outreach and social media. Coordinating participant groups on the ground, guiding performers and vendors to their designated spaces, briefing participants before their slots. Managing online presence across dozens of Sofia neighborhood groups reaching 10,000+ organic views per post.
Lagera Celebrates festival
▲ Lagera Celebrates 2025 — 7,000+ attendees
7000+ Attendees BTV & BNR Media 10+ Sponsors 4 Editions City Mayor Attended
🎄 LAGERA'S WINTER HOLIDAY (Лагера Коледува) — 3rd EDITION
The neighborhood Christmas gathering, now in its third year. Families, children, and residents come together in the park for a seasonal celebration with music, activities and community warmth. A winter counterpart to the spring festival, building year-round neighborhood identity.

MY ROLE: Technical setup and operations — installing and managing the sound equipment, running social media and outreach throughout the event, coordinating participants and guiding groups to their correct positions during the program.
Lagera Winter Holiday
▲ Lagera's Winter Holiday — packed crowd
3rd Edition Community Event Sound & Tech
🏓 LAGERA'S SPORTS HOLIDAY (Спортен Празник на Лагера)
A community sports day bringing residents together around chess and table tennis competitions held in the neighborhood. Open to all ages, focused on activating the local community around healthy recreation and friendly competition.

MY ROLE: Equipment setup and management, website administration, social media and outreach, coordinating participants and managing logistics on the day.
Chess Table Tennis Community Sport All Ages
🧹 LAGERA CLEANS (Лагера Почиства) — CRISIS RESPONSE
During Sofia's garbage collection crisis the neighborhood faced overflowing bins, abandoned furniture and waste spreading across public spaces. The association mobilized the community to take matters into their own hands.

500+ volunteers coordinated over the course of a month. Operations were organized in waves — clearing overflowing bins, removing bulk waste, coordinating with municipal services, and establishing a neighborhood defense against further dumping. The before-and-after impact was dramatic and visible to every resident.

MY ROLE: Outreach, coordination, and social media mobilization throughout the campaign.
Lagera Cleans operation
▲ Lagera Cleans — 500+ volunteers mobilized
500+ Volunteers Crisis Response 1 Month Operation Community Defense
🌳 PARK LAGERA REPAIR & PUBLIC TOILET — CIVIC WIN
Park Lagera serves thousands of residents daily but had deteriorating playground equipment and no public sanitation facilities. The association tackled both through volunteer labor, petitions to the municipality, and community fundraising to fill the gaps where institutional support fell short.

The result: repaired and restored playground equipment, and a public toilet installed in the park — a basic amenity residents had been requesting for years. Small victory. Real, visible impact.
Public toilet installed in Park Lagera
Playground equipment restored
▲ Public toilet installed · Playground restored
Volunteer Labour Municipality Petition Community Fundraising Park Restored
🎵 THE BALKANTON BUILDING STRUGGLE — ONGOING
Balkanton was Bulgaria's only state record company, founded in 1952. For four decades it was the sole producer of music in the country — folk, classical, popular, theater, poetry — accumulating an irreplaceable cultural archive. By the mid-1980s it pressed 9 million LPs annually. Its recordings remain part of the living cultural memory of the country.

When a private company acquired the historic building at 6 Haidushka Polyana Street with plans to demolish it and replace it with an apartment complex, the association helped organize large-scale public protests. The pressure worked: the municipality was forced to intervene, requiring the building to be preserved.

STATUS: The decision is currently being contested in court. The fight continues.
Cultural Heritage Public Protest Municipal Intervention ⚖ In Courts

LEADERSHIP CODEX

⚔ OPERATING PRINCIPLES
SEE ONE · DO ONE · TEACH ONE
I don't throw engineers into the deep end. I follow the doctor's method — we do it together first, then you do it, then you teach someone else. That's how skills actually transfer.
CLEAR BEATS CLEVER
Simple, reliable architecture beats elegant complexity every time. A system that works at 2am without heroics is worth more than a brilliant design nobody can maintain.
EMPATHY BEFORE EFFICIENCY
I want engineers who have interests, lives, and bring their authentic selves to work. Professionalism is overrated. Authenticity produces better outcomes and better humans.
LET PEOPLE SHINE
Taking everything on yourself isn't leadership — it's hoarding. I actively find opportunities for engineers to own work, demonstrate capability, and grow in front of customers.

// NOTABLE ENGAGEMENTS — BOSS FIGHTS

⚔ WARTIME HA DEPLOYMENT — UKRAINE
High-Availability Direct Routing Under Active Conflict Conditions
The constraint that defined everything: no cloud. Ukraine's wartime security requirements meant the entire solution had to be deployed fully on-premises. Every component — SBCs, routing, failover — had to run locally and survive infrastructure disruption.

The Ukrainian State Security apparatus was a direct stakeholder in the design review. The architecture had to pass security validation to ensure it could not be attacked or compromised by opposing forces. This was not a theoretical risk assessment — it was a live operational concern.

The result was a resilient, fully on-prem HA voice platform that went live and stayed live. If you can design for wartime Ukraine and get sign-off from state security, you can design for anything.
On-Prem Only State Security Review HA Architecture Zero Cloud
🔧 THE THREE-PBX INTEGRATION
Unifying Webex, Teams & Google Voice Across a Multi-Organization Enterprise
The customer had three separate PBX systems across different subsidiary companies, plus a deeply non-standard stack — Gmail backend with an Outlook frontend, multiple internal organizations, and a patchwork of services nobody wanted to touch.

The ask: make it all work together without replacing their existing phone number provider contracts. Most consultants said it couldn't be done cleanly.

The approach: prioritize ruthlessly. Identify which services were essential and which could be migrated to Microsoft infrastructure to unlock the integrations needed. Then build a live pilot inside their environment — not a demo, not a lab, a real working deployment — and use it to convince decision-makers one stakeholder at a time. It worked.
Webex + Teams + Google Multi-Org Live Pilot Stakeholder Management
🏗 BUILDING THE CEE PIPELINE FROM ZERO
Solo UC Practice Lead — Presales Through Delivery
When I took on the CEE region, there was no pipeline, no playbook, and no team. I built the presales and post-sales engagement model myself — architecture reviews, customer scoping, proposal design, delivery, and handoff documentation.

As the region grew, I coached incoming and junior engineers through the work: not just technical knowledge but how to read a customer, how to run a presales conversation, and how to own a complex engagement without losing the customer's trust. The goal was always to bring them to the point where they could join me in senior consultancy engagements — not just execute tasks.
Built from Zero Presales + Delivery Engineer Mentoring CEE Region
🎤 MICROSOFT IGNITE — VOICE DEEP DIVES
4-Hour Technical Presenter · Enterprise Voice in Microsoft Teams
Delivered 4-hour deep-dive sessions under the Microsoft Ignite program — demystifying every aspect of voice architecture within Microsoft Teams for large enterprise audiences. The goal: take something that intimidates most IT teams and make it legible, actionable, and actually interesting. Without putting anyone to sleep.
Microsoft Ignite 4-Hour Sessions Enterprise Voice Public Speaking
❤ PRO BONO: ASSOCIATION "LAGERA" VOICE SOLUTION
Full Microsoft Teams Deployment for a Volunteer Civic Organization
Built and funded a complete communications solution for Сдружение Лагера at my own expense. Started from the beginning: teaching the team basic computer skills, then establishing a Microsoft Teams tenant for project tracking and collaboration, then connecting it to a live voice service — all provisioned and maintained as a volunteer contribution.

Because sometimes you just do the work.
Pro Bono Teams Tenant Voice Service Self-Funded

PARTY MEMBERS

👶
JULIAN
The newest member of the party. Arrived recently and immediately became the most important person in the room. Currently leveling up rapidly. Main quest: growing up.
🐕
CURRY
Found on the street. Taken in, loved, nurtured. Extremely social — will insert herself into every conversation, every visitor's face, every moment. Barks first, asks questions never. Class: Social Butterfly. Alignment: Chaotic Loud.
🐕
CHILI
Also found on the street. Also taken in, loved, nurtured. Strongly prefers the family stays home. Together. Always. Unconvinced about Curry. Unconvinced about the baby. Unconvinced about visitors. Alignment: Neutral Homebody.
♥ Curry and Chili were street dogs before they found their home. ♥

SEND A MESSAGE

CONTACT KALIN
Enterprise telephony challenge? Writing collaboration? Community project? Want to debate Bulgarian history or argue about SIP trace analysis?

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📧 EMAIL
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КАЛИН СТОИМЕНОВ
Senior UC Architect · Writer · Community Member
Sofia, Bulgaria (EMEA)
📧
// EMAIL
Kalin.M.Stoimenov@gmail.com
📞
// PHONE
+359 898 241 343
⚠ WARNING: May respond entirely in architecture diagrams
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KALIN STOIMENOV ©

Technology consultant by profession.

Historian of the bizarre by obsession.

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