Senior Front-End Engineer

I’m helping Staffinit find a top candidate to join their team flexible for the role of Senior Front-End Engineer.

You'll build the future of financial intelligence, bridging sophisticated backend logic with user-facing experiences.

Compensation:

USD 40 - 80/hour

Location:

Remote: Estonia

Mission of Staffinit:

"Our mission: to connect talent. empower businesses. We work with clients across industries, helping them build teams that make a difference, and support professionals in finding roles where they can thrive. At our core, we combine deep recruitment expertise with a human-centred approach—ensuring that each placement aligns skills, culture and ambition.

"

What makes you a strong candidate:

• You are proficient in TypeScript, React.js, REST API.
• You have the potential to develop in WebSocket, Large language model (LLM), GraphQL, Fintech, D3.js.
• English - Fully fluent

Responsibilities and more:

The Senior Frontend Engineer sits at the intersection of frontend implementation, product logic, and data integration. This role focuses on translating designed product surfaces into working, production-grade systems. You will own the bridge between a sophisticated deterministic backend and the user-facing experiences that bring financial intelligence to life.

Key Responsibilities:

- Implement the core surfaces (Feed, Front Page, Symbol Intelligence, Charts).

- Wire them to backend APIs.

- Integrate the RS-driven ranking and search logic into the UI.

- Handle AI-assisted moderation and classification integrations so that those outputs become real-time signals the backend can consume.

Frontend Implementation:

- Build and maintain the designed UI components and pages for the User Feed (Universal Discovery Layer), Front Page news portal, Sector Hubs, and Symbol Intelligence pages.

- Implement the Creator Studio workspace, Profile & Reputation pages, and User Dashboard.

- Integrate the TradingView-style charting widget on Symbol Pages, connecting it to the backend Datafeed Adapter (UDF-compatible endpoints: /tv/symbols, /tv/search, /tv/history, /tv/quotes).

- Ensure responsive, performant rendering for real-time content streams and live market data.

Backend API Integration:

- Wire frontend surfaces to the REST, GraphQL, and WebSocket APIs that power the platform.

- Consume Allocation Domain projections (frontpage_rankings, sector rankings, symbol-level content rails) and render them in the appropriate surfaces.

- Integrate real-time data flows: RS-weighted sentiment endpoints, engagement events, and visibility tier transitions.

- Work with the Symbol Intelligence API layer (GET /symbols/search, /symbols/{symbol}/summary, /symbols/{symbol}/fp-content, /symbols/{symbol}/sentiment).

Ranking, Search & RS-Driven Behaviours:

- Expose RS-driven behaviours in the UI: visibility tiers, audition bucket progression, exploration slots, and tier graduation indicators.

- Implement search functionality that combines symbol search, sector search, and creator discovery.

- Surface the Feed Audition Engine logic — showing users how deterministic PRNG-based exploration, format-neutral ranking, and RS weighting shape their experience.

- Display Front Page, Sector, and Symbol ranking outputs with transparency into the scoring parameters.

AI & Moderation Integration:

- Integrate AI-assisted moderation pipelines into the frontend: classification APIs, LLM-assisted review outputs, and severity scoring displays.

- Handle embeddings-based search and content similarity signals, exposing these as consumable inputs for the backend Trust Domain.

- Build the RS-weighted Governance & Moderation Panels where high-RS users audit content from the social proving ground.

- Implement safety-linked UI behaviours (e.g., suppression states, boost kill-switch indicators, fraud flags).

Cross-Domain Collaboration:

- Collaborate closely with backend engineers on the Trust, Value, and Allocation domain boundaries.

- Participate in deterministic replay validation — ensuring frontend state is consistent with event-sourced backend projections.

- Contribute to API contract design and ensure frontend consumption patterns align with the canonical event envelope.

Technical Environment:

- The platform architecture is a modular monolith with clear domain separation (Trust, Value, Allocation).

- Single primary PostgreSQL cluster with replicas for read and backup.

- Canonical event spine (append-only, event-sourced) with CDC-based projection runners.

- REST / GraphQL / WebSocket API surface.

- AI moderation services (LLM classifiers, behavioural anomaly detection, embeddings).

- External market data providers with TradingView-compatible datafeed adapter.

- Deterministic PRNG and snapshot-bound parameter system for replayable ranking.

Qualifications & Experience:

Required:

- 5+ years of professional frontend engineering experience shipping production web applications.

- Deep proficiency in React (or equivalent modern framework) with TypeScript.

- Strong experience consuming REST, GraphQL, and WebSocket APIs in complex, data-intensive UIs.

- Hands-on experience integrating third-party charting libraries (TradingView, D3, Recharts or similar).

- Working knowledge of search integration patterns (full-text search, embeddings, ranking/relevance tuning).

- Familiarity with AI/ML API integration (classification endpoints, embedding APIs, LLM-powered features).

- Experience with event-driven or event-sourced architectures and real-time data rendering.

Preferred:

- Experience in fintech, financial media, or social/content platforms.

- Familiarity with reputation systems, credibility scoring, or trust & safety tooling.

- Knowledge of PostgreSQL, CDC patterns, and projection-based read models.

- Experience with deterministic systems, replay frameworks, or audit-grade logging.

- Understanding of token economics, double-entry ledger systems, or blockchain-adjacent reward models.

What We Offer:

- Ground-floor role in a platform designed from first principles to reshape financial media credibility.

- Direct collaboration with the founder on product and technical direction.

- Opportunity to work on a novel deterministic architecture — not a CRUD app with a feed bolted on.

- Remote-first, flexible engagement with a lean, high-autonomy team.

- Potential participation in the Client's token economy (FPT) as it activates in Phase 2+.

Your potential leader(s):

• Piotr Chabros - Digital entrepreneur, board member, and CEO.