Custom software
Web and mobile applications built to fit your business — scalable architecture, clean code, and interfaces people actually want to use.
Apex
Custom software, business automation, and applied AI for companies across Europe — engineered with mathematical rigor and maintained for the long run.
Every hard problem has a summit. We engineer the path to it.
Apex Digital Lab builds, integrates, and maintains software for businesses that need more than a quick delivery — work grounded in real mathematics and modern AI, and supported long after launch.
What we build
From first line to long-term care.
We cover the full lifecycle of a software product — design and development, the connections that make it useful, and the ongoing work that keeps it fast and reliable.
Business automation
We replace repetitive, manual work with reliable software — internal tools, workflows, and pipelines that save hours every week.
Software integrations
Connect the systems you already run — APIs, payments, CRMs, and data flows — so your tools work as one instead of in silos.
Applied AI
Practical AI that earns its place — automation, retrieval, and intelligent features built on a strong mathematical foundation, not hype.
Performance & reliability
Bug fixing, performance tuning, and refactoring for existing products — measurable improvements to speed, stability, and cost.
Support & maintenance
Ongoing care under a retainer — monitoring, updates, security, and steady improvement, so your software keeps working as you grow.
How we work
Rigor first. Then the build.
A strong mathematical background shapes how we reason about systems — performance, correctness, and the trade-offs that matter. AI is part of how we work, used where it genuinely helps.
01
Discovery
We learn your problem, constraints, and goals — and define what success actually looks like before writing code.
02
Architecture
We design the system deliberately: the right model, the right structure, and the trade-offs made explicit.
03
Build
Iterative delivery with clean, tested code and regular checkpoints, so you see progress and steer it.
04
Verify
Correctness and performance are measured, not assumed — we validate against the goals we set in discovery.
05
Operate
We stay on to maintain and improve what we built — the work doesn't end at launch.
Per outcome
Project-based
A defined scope with clear deliverables, timeline, and price — ideal for launching something new.
Flexible
Fixed or hourly
Fixed-price for well-defined work, or hourly when scope evolves — whichever fits the engagement.
Ongoing
Support retainers
A recurring monthly relationship for maintenance, support, and continuous improvement of your software.
Advanced AI
AI built on real mathematics — not hype.
A strong mathematical foundation is what separates AI that demos well from AI that works in production. We design, build, and operate machine-learning and language systems that are measurable, reliable, and grounded in your data.
Custom models & ML
Predictive models, classification, and forecasting trained on your data — not off-the-shelf guesses.
LLM & agent systems
Assistants, copilots, and autonomous workflows grounded in your domain and your tools.
Retrieval (RAG)
Answer over your own knowledge with accuracy and citations, not hallucinations.
Optimization & algorithms
Routing, scheduling, pricing, and other hard problems solved with real applied mathematics.
Automation pipelines
Data ingestion, processing, and decision automation, built end to end and made dependable.
Evaluation & reliability
Measurable quality, guardrails, and monitoring so AI behaves predictably in production.
Capabilities
A senior, math-first engineering team.
We work across the modern stack, and we're comfortable in the harder places — algorithms, data, and AI — where deep experience makes the difference.
Product engineering
Web appsMobile appsAPIs & servicesInternal toolsUX & interfaceDesign systemsReal-timeWebGL & 3D
Platform & cloud
Cloud infrastructureCI/CDObservabilityDatabasesSecurityContainersServerlessInfrastructure as code
Data & AI
Applied machine learningLLMs & agentsRetrieval (RAG)Automation pipelinesData engineeringVector searchMLOpsEvaluation
Foundations
MathematicsAlgorithmsOptimizationStatistics & probabilityNumerical methodsPerformance
Math-first
AI-native
Senior engineers
EU-based · GDPR-ready
Long-term support
Products
We build our own software, too.
Alongside client work, we develop our own SaaS and subscription tools — products that grow out of problems we keep seeing.
Apex VPN
A fast, privacy-first VPN — no logs, strong encryption, and a clean app. Built for people who genuinely care about their data.
Apex Browser
A browser built around privacy and focus — sensible defaults, no surveillance baked in, and fast where it counts.
More on the way
Additional subscription tools are in planning. Want early access, or to suggest one? We'd love to hear from you.
Why Apex
What working with us is like.
Honest scope
Clear estimates and trade-offs up front. No surprises, no padding — we tell you what something really takes.
You own it
Your code, your data, your accounts. Everything is documented and handed over cleanly.
We stay
We're built for the long run — maintenance and support are core to what we do, not an afterthought.
It depends on the engagement. We offer project-based pricing for defined scopes, fixed or hourly rates when scope evolves, and recurring monthly retainers for ongoing support and maintenance. After an initial conversation we'll recommend the model that fits and give you a clear estimate.
Both. We build new products from scratch, and we take on existing codebases for bug fixing, performance improvements, integrations, and long-term maintenance — including software we didn't originally write.
Where it genuinely helps. With a strong mathematical background, we apply machine learning, LLMs, retrieval, and automation deliberately — for real features and efficiency gains — rather than adding AI for its own sake.
You do. On full payment, deliverables and their intellectual property are yours, as set out in the project agreement. We're also happy to sign mutual NDAs.
We're based in Estonia and work to EU standards. Personal data is handled in line with the GDPR, and we can put a data processing agreement in place where we process data on your behalf. See our Privacy Policy for details.
Yes. With a strong mathematical foundation we build custom machine-learning models, LLM and retrieval systems, and optimisation algorithms — and we also integrate existing AI services where that's the better fit.
Mainly small and medium-sized businesses — from early-stage startups to established companies — across Europe and internationally. We scope engagements to fit your stage and budget.
We're an EU company based in Estonia and work remotely with clients across Europe and beyond, collaborating across time zones using your preferred tools.
Yes. We regularly audit and take over existing codebases — documenting what's there, stabilising it, and then improving or extending it.
Through deliberate architecture, code review, automated testing where it pays off, and measuring correctness and performance against the goals we set in discovery.
Get in touch with a short description of what you need. We'll set up a call, understand the problem, and come back with a proposed approach, model, and estimate.
Let's build something solid.
Tell us about your product, your problem, or the software you need looked after. We'll get back to you with a clear next step.