Dominik Bullo
Senior Software Engineer & Tech Lead · Stockholm
I operate in environments where reliability is not a KPI: it is a grid obligation.
Who I am
The energy grid is changing faster than most software can keep up with. I build the systems that keep pace: behind-the-meter asset controllers, multi-market optimisation engines, and flex and balance market dispatch pipelines across Nordic power markets.
Good infrastructure is the same problem regardless of domain: clear boundaries, reliable failure modes, and systems the next engineer can understand and change. I hold that standard in a sector where the cost of getting it wrong is a missed market activation or a grid penalty.
I have worked at every level: as a founder building from zero, as a tech lead owning delivery and architecture, and as a hands-on engineer when the problem demands it. That breadth is intentional. I take engagements where I can own the hard parts.
What I build
Energy Management Systems (EMS): design, build, qualify, operate
SCADA platforms: grid-reliability standards, real-time controls
BESS (Battery Energy Storage Systems): PPC controllers, ancillary service dispatch
Wind and hydro asset controls and integration
Nordic ancillary services: FCR-N, FCR-D, aFRR, mFRR
Asset prequalification and SvK (Svenska kraftnät) grid qualification
Nordic power market operations: Nord Pool, elbas, intraday, day-ahead
Python 
FastAPI 
Django 
PostgreSQL 
Docker 
Kubernetes 
GCP 
AWS 
Terraform 
Timescale 
Sentry 
GitHub Actions 
Vue.js 
TypeScript Where I've worked
Built an internal prequalification tool that automated SvK submission validation across 10 sites, cutting a multi-week manual process to hours and removing a recurring bottleneck before every market qualification.
Built backend systems connecting a 40 MW BESS fleet to live flexibility and ancillary service markets at Stockholm's largest district heating operator, covering edge telemetry ingestion through to market dispatch and settlement.
Designed and built a grid-qualified EMS managing 40 MW across FCR and mFRR, owning the full chain from SCADA integration through market dispatch and settlement to SvK grid qualification.
Led 5 engineers (no prior SPA experience) from zero to first paying customer in 3 months: 4Shipper, a freight TMS that onboarded ~100 clients across automotive and defence.
Full history at bullo.sk
What I write about
Grid software, reliability engineering, and what it actually takes to qualify a BESS or wind asset for Nordic ancillary service markets. The failure modes that don't appear in any TSO document. What a prequalification test is really checking.
Read the writing →Notable achievements
Architected EMS and PPC controllers for BESS across Nordic energy markets: from hardware integration to live market dispatch, with full technical ownership
Drove SvK grid qualification end to end for a 40 MW system: SCADA integration, test validation, and regulatory submission. Asset qualified and revenue-generating from day one
Tech lead on 8-person cross-functional delivery: shipped a multi-asset flexibility platform (BESS, wind, hydro) in 3 months against a 6-month plan, with expanded scope
Built backend systems for Stockholm Exergi, Stockholm's largest district heating operator (800 000+ residents): 40 MW BESS fleet connected to live ancillary service markets
Founded and ran DeOutSol: delivered production software for ~10 clients across European markets