Senior Fullstack Engineer
Building product-grade systems for crypto infrastructure, governed AI workflows, and evidence-heavy decision tools.
Portfolio / CV / LinkedIn / Email
I like systems that make serious work easier to trust: clear data models, inspected source evidence, deterministic workflows, replayable runs, strong user surfaces, and enough operational discipline that a team can understand what happened after the fact.
| Direction | What I tend to ship |
|---|---|
| Governed agent systems | Harnesses, lifecycle gates, evals, traces, evidence maps, replay, review states, and artifact contracts. |
| Crypto infrastructure | Explorers, indexers, governance tools, wallet flows, Cosmos and CosmWasm product surfaces, APIs, and Postgres-backed operational systems. |
| Product engineering | React and TypeScript applications with real workflows, clear information architecture, design systems, tests, and production-ready interfaces. |
| Analytical tooling | Trading journals, thesis workbenches, quant consoles, deterministic derivation pipelines, and AI-assisted review loops. |
|
Strict runtime for governed agent work. TypeScript/Bun runtime that makes agent runs lifecycle-bound, policy-governed, capability-brokered, evidence-grounded, eval-checked, replayable, and auditable. Runtime contracts / Tool broker / Gates / Evals / Run ledger |
Spec-driven frontend agent harness. Turns product ideas, screenshots, specs, and repo context into deterministic frontend contract packages that agents can implement tests-first and verify with Playwright evidence. Product intent / Design contracts / Test-first plans / Verification |
Portable workflow skills for messy agent work. Installable skill pack for splitting fuzzy goals into bounded work units, building dossiers, separating implementation from verification, and leaving resumable Markdown state. Source grounding / Handoffs / Acceptance criteria / Repair loops |
Not every repository needs equal weight. The work I want to be known for sits in a few connected lanes:
| Thread | Projects | Signal |
|---|---|---|
| Agent runtime infrastructure | Specwright, Workflow Supervisor, Crux Harness | Lifecycle authority, policy gates, tool boundaries, evidence capture, replay, evals, and durable run artifacts. |
| Spec-first product delivery | Archetype, Crux Studio, Portfolio | Turning ambiguous product intent into reviewable contracts, polished interfaces, Playwright evidence, and handoff-ready packages. |
| Market and decision systems | Parallax, Trade Journal, Aurelian Quant Console | Deterministic analytics, thesis review, behavioral detectors, risk boundaries, portfolio state, and audit-friendly reports. |
| Crypto product infrastructure | SEDA Explorer, SEDA Treasury, Enterprise DAO, Enterprise Hub | Indexers, explorers, governance flows, wallet signing, public APIs, treasury operations, and compliance-minded Web3 products. |
Core build TypeScript, React, Next.js, Node.js, Go, PostgreSQL
Product UI TanStack, Angular, RxJS, design systems, workflow-heavy dashboards
Infra and data REST, GraphQL, workers, indexers, Redis, Prisma, Drizzle, event streams
Crypto/Web3 Cosmos SDK, CosmWasm, EVM, wallet flows, governance, explorers
AI systems Tool brokers, evals, traces, schemas, grounding checks, replay logs
Verification Playwright, Vitest, Jest, CI gates, release checks, audit bundles
- Start with the real workflow: who uses it, what state they need to trust, and what failure looks like.
- Give complex systems a visible shape: source evidence, lifecycle state, risk, review status, and next action should be obvious.
- Put deterministic rails around AI: contracts, policies, evals, provenance, and replay matter more than a clever prompt.
- Treat interface quality as engineering quality: information hierarchy, motion, density, empty states, and errors all carry trust.
- Leave the next person with artifacts: schemas, tests, traces, reports, release notes, and operating context.
| Period | Role | Focus |
|---|---|---|
| 2024 to now | Senior Fullstack Engineer, SEDA | Explorer, treasury governance, design-system monorepo, backend APIs, Go publishers, and test coverage. |
| 2022 to 2024 | Senior Fullstack Engineer, Terraform Labs | Enterprise DAO, DAO v2, Enterprise Hub, indexer and middleware work, production response. |
| 2022 | Frontend Engineer, TX Services | JobCloud marketplace work, Angular, GraphQL, NestJS middleware, NX libraries, and Jest patterns. |
| 2020 to 2022 | Frontend Engineer, Daon | Enterprise identity and biometrics admin UI, React tools, mobile web views, and frontend leadership. |
| 2019 to 2020 | Frontend Engineer, IBS | Live betting interfaces, real-time odds, market selection, bet slips, crawler and service health tools. |
I am open to senior fullstack, Web3 infrastructure, AI-native product, and systems-heavy product engineering roles.
nikola95cehic@gmail.com / nikola-cehic-portfolio.vercel.app / CV.pdf