Services

Production-Grade Engineering

Full-stack development backed by ~350K LOC of production code, an O'Reilly book on prompt engineering, and experience teaching 306K+ developers taught.

Production SaaS Development

Production-ready architecture with auth, payments (Stripe), and multi-tenancy. Comprehensive automated test coverage included.

~350K LOC production code | 74,896 LOC tests | 347 database migrations

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LLM Engineering

Multi-provider orchestration for cost control and redundancy. AIMD rate limiting prevents API failures and cost overruns.

O'Reilly Book (10K+ sold) | 917 RPS multi-provider throughput | Production AIMD rate limiting

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React & Next.js Development

TypeScript strict mode catches errors at compile time. TanStack Query for efficient data fetching and responsive interfaces under load.

125,292 LOC TypeScript | React 19 | App Router patterns

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Python Backend Development

Type-safe FastAPI with bounded concurrency for reliable performance during traffic spikes. Static analysis catches bugs before deployment.

125,994 LOC Python | mypy strict | Factory-first testing

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Observability & Monitoring

Custom dashboards for real-time system visibility. Configured alerts with appropriate thresholds to reduce noise.

8 dashboards | 13 alerts | 30+ custom OTEL metrics

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Data Engineering

Multi-tenant pipelines with row-level security for data isolation. Query optimization for millisecond response times.

347 migrations | 70+ RPCs | Redis caching

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Cloud Infrastructure

Infrastructure-as-code for consistent, reproducible environments. Version-controlled deployments with quick rollback capability.

Terraform IaC | 7 deployment scripts | GitHub Actions CI/CD

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Technical Training

Practical, hands-on curriculum developed for General Assembly and refined across 45+ bootcamps. Focus on applied skills.

45+ bootcamps | 306,000+ Udemy learners | 5+ years teaching

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Why Me

Experience That Matters

Proven at Scale

Built systems processing 7K daily queries with capacity to scale to 100K.

Full Observability

Real-time dashboards and alerts. Issues visible before they affect users.

Clear Communication

Teaching 306,000+ developers requires explaining complex systems simply.

Single Owner

Architecture through deployment. No handoffs between teams.

Client Reviews

What Clients Say

More reviews on Google
Rhys Fisher
Rhys Fisher
James has been a key measurement partner for a number of years. While running a boutique analytics agency, I would bring Just Understanding Data into a number of growth transformation projects at a time, across a portfolio of B2B SaaS and D2C E-commerce clients. These projects involved solving a diverse set of challenges. Together we worked on bespoke data collection solutions, applying machine learning models to marketing challenges, and surfacing often complex ideas into easy to digest actionables that clients could act on. James is well spoken and handles client communications well. His super power is being able to create a shared understanding around the insights drawn with analytics. Without James, you’ll be leaving growth on the table. 5* recommendation from me.
Shuaib Ahmed
Shuaib Ahmed
James is literally a legend! I asked him to perform a web scraping task that was quite tedious revolving academic abstracts and he literally did it within a week after posting the gig. He also went above and beyond and gave me tips on applying NLP techniques which worked out quite well for my solution the month after. I would highly recommend working with him for any of your data collection needs or if you just need tips/help solving any Data Science issues!
Jeanne Keith Felipe
Jeanne Keith Felipe
James is a very nice and professional person to do business with. He doesn't mind explaining technical information to give you a clearer picture of how online business works. He has a great work ethic and I'm sure Insight Jar will go far

Ready to build something great?

Production-grade software and data engineering. Pick a call slot or send over the details by email.

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