MK Dynamics — software studio

Make coaching accessible for every athlete, sustainable for every coach.

We design and operate software for the fitness industry and open payment infrastructure — replacing manual, scattered workflows with purpose-built platforms.

Team: 2 founders

Products: 3 active, 1 proposed

Core stack: Go · gRPC · Next.js

Focus: Fitness × Payments

"Make professional coaching accessible to every athlete and sustainable for every coach, by replacing manual workflows with purposeful software."

Coaches managing multiple athletes lose disproportionate time to logistics — writing plans, chasing check-ins, tracking progress by hand. Athletes lack a clear view of their program and often get feedback too late to act on it.

Every product we build removes one layer of that friction, whether that's a training plan, a video demonstration, or the payment rail underneath.

What we build

Product register

Four products across two domains: coach–athlete software, and payment infrastructure.

Product	Description	Stack	Status
Trainelygithub.com/ProgressHQ	Flagship coach–athlete platform: program delivery, session tracking, in-app messaging	Go · gRPC · Postgres	Active
FitVaultpay-per-view video library	Searchable, multilingual exercise video catalogue embedded into Trainely plans	Next.js 16 · TS	Active dev
OpenPay SDKgithub.com/ProgressHQ	Provider-neutral payment SDK — GNU Taler reference, pluggable commercial backends	TypeScript	Early dev
GitHub PM Layerproposal	Two-way sync with GitHub Issues & Projects, built into Trainely for coaching businesses	—	Proposal

Active

Trainely

Internal codename ProgressHQ. A structured workspace replacing spreadsheets, message threads, and PDF programs with purpose-built coaching tools.

For coaches

Program builderMulti-week plans with exercises, sets, reps, notes
Athlete rosterTrack who has completed sessions, who hasn't
OnboardingEmail invites, role-based access
In-app messagingTalk to athletes without leaving the platform

For athletes

Plan viewThis week's sessions, laid out clearly
Session loggingWeights, reps, notes → performance history
Progress trackingVisualised performance over time
NotificationsAlerts on plan updates and messages

Active dev

FitVault

Professionally recorded exercise demonstrations, embedded at the point of need inside a training plan — no context switch for the athlete.

Catalogue

SearchableBy muscle group, equipment, difficulty, movement
MultilingualEnglish and Polish at launch
Paywalled HDPublic preview clips, per-video or subscription access

Trainely integration

GET/api/exercises/{id}
Resolve exercise metadata by ID
GET/api/exercises/{id}/access
Check access, return signed URL or 403

Early dev

OpenPay SDK

Open-source, provider-neutral payment layer. One interface across multiple backends, so switching or combining providers doesn't mean rewriting business logic. Scoped through an NGI grant application.

Providers

GNU TalerReference implementation

StripePlanned

MolliePlanned

PayPalPlanned

Mock / test harnessIncluded