Industries › EV, Energy & Smart Grid
OCPP & CSMS backend development for charge-point operators and fleets.
We build and scale CSMS backends for charge-point operators and fleets — normalizing OCPP across mixed hardware vendors, running smart charging and demand response, and keeping 20,000+ chargers online when downtime costs real revenue.
Where our EV practice stands today
Trusted by operators in this sector
What we build
Six core capabilities. Each one engineered to compound — so your platform gets cheaper to run as it scales, not more expensive.
Open Charge Point Protocol implementation across versions — from legacy 1.6 fleets through to native 2.0.1 and 2.1 features. We normalize heterogeneous hardware behind a single backend.
Telemetry ingestion at peak millions of events per second, with sub-second alerting on charger faults, energy anomalies and connectivity drops.
Dynamic load balancing across sites, dynamic pricing engines, peak-shaving algorithms and demand-response integration at scale.
Bidirectional charging integration with ISO 15118 plug-and-charge support. We coordinate EVs, charging infrastructure and energy providers.
Payment infrastructure tailored to region and operator model — credit cards, mobile wallets, RFID, fleet contracts, subscription billing. PCI-DSS compliance built into the architecture.
At-a-glance operational dashboards built for site managers and CPO operations teams — uptime trending, session analytics, energy throughput, revenue forecasting.
Featured engagement
InCharge Energy came to Wellnuts to build a web-based platform managing EV fleet charging stations — designed for remote control and monitoring across distributed sites over a secure network.
We architected the platform end-to-end: an intuitive operator interface, real-time telemetry ingestion, a health-check and reporting subsystem, OCPP normalization across mixed hardware. Five years in, the team continues to ship features alongside ours — a partnership that has scaled with the business.
Standards & protocols
Modern EV infrastructure is held together by a handful of protocols — get them wrong, and your roaming, billing and interoperability stops working. We've implemented all of them in production.
Open Charge Point Protocol — full spec coverage across legacy and current versions, including security extensions and ISO 15118 device bridging.
Plug-and-charge, bidirectional energy transfer (V2G), high-level communication between EV and charger over PLC and WiFi.
Open Charge Point Interface — roaming between operators, session reconciliation across networks, e-mobility service provider integrations.
Open InterCharge Protocol — Hubject-compatible roaming for European charge-point operators and mobility service providers.
Demand response integration with grid operators and utilities — automated load curtailment, real-time pricing signals, DER coordination.
Substation automation and SCADA telemetry — for clients who integrate charging assets directly into utility operations.
Compliance-grade architecture from day one — audit logs, encryption at rest and in transit, role-based access and data-subject controls, aligned with SOC 2 and ISO 27001 requirements.
IoT transport protocols underneath the charge-point layer — when your hardware partners ship with non-standard firmware stacks.
Why operators come to us
The boring infrastructure problems that keep CPOs and energy operators awake at night — eventually solved, then engineered out of existence.
Smart charging algorithms and remote energy monitoring optimize consumption automatically — independent of operator, season or grid conditions. Architectural choices that compound into measurable cost reductions year over year.
A platform engineered correctly the first time stays cheap to run. Most of our long-term EV clients see 30–60% infrastructure cost reduction once we re-architect for load patterns that survive the next 10× of growth.
Charging infrastructure spread across cities, sites and countries — controllable from a single operations interface. We eliminate the manual-touch operations that don't scale beyond your first thousand stations.
Health checks, predictive maintenance signals, anomaly detection on telemetry streams. Issues surface in dashboards before they become incidents — before customer-visible failures, not after.
GDPR-ready controls, aligned with SOC 2 and ISO 27001 requirements, applied at the architecture level rather than retrofitted before due diligence. Audit logs, encryption, role-based access — engineered into the data layer, not bolted on later.
Operations dashboards designed for the people who run the network — site managers, dispatch teams, billing operations. Clear hierarchies, sensible defaults, minimal training time.
Client voices
Wellnuts built our entire EV charging management portal from the ground up — key functional modules, server architecture, UI. We've been working together for over four years, and the team continues to provide ongoing support and expand our system. We highly recommend Wellnuts as a reliable IT partner.
We hired Wellnuts to optimize our EV charging load management functionality and were completely satisfied with the partnership. The team provided us with in-depth consultation and valuable advice. We liked their communication and responsible approach to the working process.
More engagements in EV, energy and grid infrastructure
A web-based platform managing 10,000+ EV chargers — OCPP normalization across mixed hardware, smart energy optimization, operator dashboards.
A plug-and-play M2M platform for a logistics operator — real-time fleet tracking, ELD compliance, OBD2 telemetry. 40% lower maintenance cost, 20% lower fuel spend.
Frequently asked questions
If your question isn't here, ask it directly — a senior engineer responds, not a sales team.
Tell us what you're operating, where the system is bending under load, and what scale looks like in twelve months. A senior engineer will write you back within two business days.
Prefer email? [email protected]
We work with a deliberate roster of clients each year. If we're not the right fit, we'll tell you — and point you somewhere that is.
Adjacent territories where our engineering goes
Telematics, ELD compliance, OBD-II ingestion and route optimization for connected fleets. Often integrated alongside EV charging in commercial fleet operations.
Properly-sized clusters, smarter caching, BEAM concurrency where it earns its keep — architectural choices that survive your next 10× of EV load.